├── .github └── FUNDING.yml ├── .gitignore ├── .travis.yml ├── LICENSE ├── README.md ├── docs ├── GBCribSheet000129.pdf ├── GB_CPU_Manual.pdf └── pandocs.htm ├── gb ├── core │ └── core.go ├── cpu │ ├── cb_opcodes.go │ ├── common.go │ ├── cpu.go │ ├── functors.go │ ├── normal_opcodes.go │ ├── registers.go │ ├── serial.go │ ├── timers.go │ └── timing.go ├── input │ └── input.go ├── mapper │ └── mapper.go ├── mbcs │ ├── common.go │ ├── io.go │ ├── iovalues.go │ ├── mbc1.go │ └── romonly.go ├── util │ ├── constants.go │ ├── functions.go │ └── types.go └── video │ ├── background.go │ ├── sprites.go │ ├── video.go │ └── window.go ├── glfw └── glfw.go ├── main.go ├── opengl └── opengl.go ├── screenshots ├── screenshot1.png └── screenshot2.png ├── slides └── Golang Emus.pdf └── test_roms ├── cpu_instrs ├── cpu_instrs.gb ├── individual │ ├── 01-special.gb │ ├── 02-interrupts.gb │ ├── 03-op sp,hl.gb │ ├── 04-op r,imm.gb │ ├── 05-op rp.gb │ ├── 06-ld r,r.gb │ ├── 07-jr,jp,call,ret,rst.gb │ ├── 08-misc instrs.gb │ ├── 09-op r,r.gb │ ├── 10-bit ops.gb │ └── 11-op a,(hl).gb └── readme.txt ├── instr_timing ├── instr_timing.gb └── readme.txt ├── testgb ├── PUZZLE.GB ├── RPN.GB ├── SOUND.GB ├── SPACE.GB ├── SPRITE.GB └── TEST.GB └── workshop.rom /.github/FUNDING.yml: -------------------------------------------------------------------------------- 1 | # These are supported funding model platforms 2 | 3 | github: drhelius 4 | patreon: # Replace with a single Patreon username 5 | open_collective: # Replace with a single Open Collective username 6 | ko_fi: # Replace with a single Ko-fi username 7 | tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel 8 | community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry 9 | liberapay: # Replace with a single Liberapay username 10 | issuehunt: # Replace with a single IssueHunt username 11 | otechie: # Replace with a single Otechie username 12 | custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2'] 13 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Object files, Static and Dynamic libs (Shared Objects) 2 | *.o 3 | *.a 4 | *.so 5 | 6 | # Folders 7 | _obj 8 | _test 9 | 10 | # Architecture specific extensions/prefixes 11 | *.[568vq] 12 | [568vq].out 13 | 14 | *.cgo1.go 15 | *.cgo2.c 16 | _cgo_defun.c 17 | _cgo_gotypes.go 18 | _cgo_export.* 19 | 20 | _testmain.go 21 | 22 | *.exe 23 | *.test 24 | *.prof 25 | *.zip 26 | *.gb 27 | 28 | debug 29 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: go 2 | 3 | before_install: 4 | - sudo apt-get -qq update 5 | - sudo apt-get install -y libgl1-mesa-dev xorg-dev 6 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | {one line to give the program's name and a brief idea of what it does.} 635 | Copyright (C) {year} {name of author} 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | {project} Copyright (C) {year} {fullname} 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | demo-emulator [![Build Status](https://travis-ci.org/drhelius/demo-emulator.svg?branch=master)](https://travis-ci.org/drhelius/demo-emulator) 2 | ======= 3 | Copyright © 2016 by Ignacio Sanchez 4 | 5 | Nintendo Game Boy emulator written in Go to be used in workshops about emulator programming. 6 | 7 | Follow me on Twitter for updates: http://twitter.com/drhelius 8 | 9 | ![Screenshot](/screenshots/screenshot1.png "Screenshot") ![Screenshot](/screenshots/screenshot2.png "Screenshot") 10 | 11 | Presentation 12 | ------------ 13 | 14 | https://speakerdeck.com/drhelius/8-bit-emulator-programming-with-go 15 | 16 | Requirements 17 | ------------ 18 | 19 | Before you start, make sure you have Go installed and ready to build applications: https://golang.org/doc/install 20 | 21 | Once you have a working Go environment you'll need to install the following dependecies: 22 | 23 | #### Windows 24 | 25 | - GCC 64 bit installed: http://tdm-gcc.tdragon.net/download 26 | 27 | #### Linux 28 | 29 | - Ubuntu: sudo apt-get install build-essential libgl1-mesa-dev xorg-dev 30 | - Fedora: sudo dnf install @development-tools libX11-devel libXcursor-devel libXrandr-devel libXinerama-devel mesa-libGL-devel libXi-devel 31 | 32 | #### Mac OS X 33 | 34 | - You need Xcode or Command Line Tools for Xcode (xcode-select --install) for required headers and libraries. 35 | 36 | Building 37 | -------- 38 | Run this command to let Go download and build the sources. You don't even need to clone this repo, Go will do it for you: 39 | 40 | ``` 41 | go get -u github.com/drhelius/demo-emulator 42 | ``` 43 | 44 | Running 45 | ------- 46 | Once built you can find the emulator binary in $GOPATH/bin. Use it with the -rom argument in order to load a Game Boy ROM file: 47 | 48 | ``` 49 | $GOPATH/bin/demo-emulator -rom path/to/your_rom.gb 50 | ``` 51 | 52 | Controls 53 | -------- 54 | ``` 55 | START = Enter 56 | SELECT = Space 57 | A = S 58 | B = A 59 | Pad = Cursors 60 | ``` 61 | 62 | 63 | License 64 | ------- 65 | 66 | This program is free software: you can redistribute it and/or modify 67 | it under the terms of the GNU General Public License as published by 68 | the Free Software Foundation, either version 3 of the License, or 69 | any later version. 70 | 71 | This program is distributed in the hope that it will be useful, 72 | but WITHOUT ANY WARRANTY; without even the implied warranty of 73 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 74 | GNU General Public License for more details. 75 | 76 | You should have received a copy of the GNU General Public License 77 | along with this program. If not, see http://www.gnu.org/licenses/ 78 | -------------------------------------------------------------------------------- /docs/GBCribSheet000129.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/docs/GBCribSheet000129.pdf -------------------------------------------------------------------------------- /docs/GB_CPU_Manual.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/docs/GB_CPU_Manual.pdf -------------------------------------------------------------------------------- /gb/core/core.go: -------------------------------------------------------------------------------- 1 | package core 2 | 3 | import ( 4 | "fmt" 5 | "io/ioutil" 6 | 7 | "github.com/drhelius/demo-emulator/gb/cpu" 8 | "github.com/drhelius/demo-emulator/gb/input" 9 | "github.com/drhelius/demo-emulator/gb/mapper" 10 | "github.com/drhelius/demo-emulator/gb/mbcs" 11 | "github.com/drhelius/demo-emulator/gb/util" 12 | "github.com/drhelius/demo-emulator/gb/video" 13 | ) 14 | 15 | var pallete = [12]uint8{ 16 | // R G B 17 | 0x87, 0x96, 0x03, // color 0 18 | 0x4d, 0x6b, 0x03, // color 1 19 | 0x2b, 0x55, 0x03, // color 2 20 | 0x14, 0x44, 0x03} // color 3 21 | 22 | // RunToVBlank runs a single frame of the emulator 23 | // The emulator must run at 60fps 24 | func RunToVBlank(colorFrameBuffer []uint8) { 25 | 26 | // keep updating each system 27 | // until the vblank is reached 28 | for vblank := false; !vblank; { 29 | clockCycles := cpu.Tick() 30 | vblank = video.Tick(clockCycles) 31 | input.Tick(clockCycles) 32 | } 33 | 34 | // the frame buffer of the Game Boy encodes color 35 | // as a four shades of gray (or green) 36 | // we have to transform these 4 colors to RGB by using 37 | // a predefined pallete 38 | for i, pixelCount := 0, util.GbWidth*util.GbHeight; i < pixelCount; i++ { 39 | colorFrameBuffer[i*4] = pallete[video.GbFrameBuffer[i]*3] // red 40 | colorFrameBuffer[(i*4)+1] = pallete[(video.GbFrameBuffer[i]*3)+1] // green 41 | colorFrameBuffer[(i*4)+2] = pallete[(video.GbFrameBuffer[i]*3)+2] // blue 42 | } 43 | } 44 | 45 | // LoadROM loads a new rom into the emulator 46 | // this fucntion must be called before running RunToVBlank 47 | func LoadROM(filePath string) { 48 | 49 | fmt.Printf("loading ROM \"%s\"...\n", filePath) 50 | 51 | data, err := ioutil.ReadFile(filePath) 52 | 53 | if err != nil { 54 | panic(err) 55 | } 56 | 57 | cartType := data[0x147] 58 | var m mapper.Mapper 59 | 60 | // check the memory mapper of the ROM 61 | switch cartType { 62 | case 0x00: 63 | fmt.Println("found ROM") 64 | m = new(mbcs.RomOnly) 65 | case 0x08: 66 | fmt.Println("found ROM + SRAM") 67 | m = new(mbcs.RomOnly) 68 | case 0x09: 69 | fmt.Println("found ROM + SRAM + BATT") 70 | m = new(mbcs.RomOnly) 71 | case 0x01: 72 | fmt.Println("found MBC1") 73 | m = new(mbcs.MBC1) 74 | case 0x02: 75 | fmt.Println("found MBC1 + SRAM") 76 | m = new(mbcs.MBC1) 77 | case 0x03: 78 | fmt.Println("found MBC1 + SRAM + BATT") 79 | m = new(mbcs.MBC1) 80 | default: 81 | // MBC1 and ROM are the only cartridges supported 82 | panic(fmt.Sprintf("cartridge type not supported: %d", cartType)) 83 | } 84 | 85 | // once we know which is the correct memory mapper 86 | // we inject it into the systems that use the memory 87 | m.Setup(data) 88 | cpu.SetMapper(m) 89 | video.SetMapper(m) 90 | } 91 | 92 | // ButtonPressed tells the emulator that a button has been pressed 93 | func ButtonPressed(button util.GameboyButton) { 94 | input.ButtonPressed(button) 95 | } 96 | 97 | // ButtonReleased tells the emulator that a button has been released 98 | func ButtonReleased(button util.GameboyButton) { 99 | input.ButtonReleased(button) 100 | } 101 | -------------------------------------------------------------------------------- /gb/cpu/cb_opcodes.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | func opcodeCB0x00() { 4 | // RLC B 5 | opcodesRLC(bc.GetHighReg()) 6 | } 7 | 8 | func opcodeCB0x01() { 9 | // RLC C 10 | opcodesRLC(bc.GetLowReg()) 11 | } 12 | 13 | func opcodeCB0x02() { 14 | // RLC D 15 | opcodesRLC(de.GetHighReg()) 16 | } 17 | 18 | func opcodeCB0x03() { 19 | // RLC E 20 | opcodesRLC(de.GetLowReg()) 21 | } 22 | 23 | func opcodeCB0x04() { 24 | // RLC H 25 | opcodesRLC(hl.GetHighReg()) 26 | } 27 | 28 | func opcodeCB0x05() { 29 | // RLC L 30 | opcodesRLC(hl.GetLowReg()) 31 | } 32 | 33 | func opcodeCB0x06() { 34 | // RLC (HL) 35 | opcodesRLCHL() 36 | } 37 | 38 | func opcodeCB0x07() { 39 | // RLC A 40 | opcodesRLC(af.GetHighReg()) 41 | } 42 | 43 | func opcodeCB0x08() { 44 | // RRC B 45 | opcodesRRC(bc.GetHighReg()) 46 | } 47 | 48 | func opcodeCB0x09() { 49 | // RRC C 50 | opcodesRRC(bc.GetLowReg()) 51 | } 52 | 53 | func opcodeCB0x0A() { 54 | // RRC D 55 | opcodesRRC(de.GetHighReg()) 56 | } 57 | 58 | func opcodeCB0x0B() { 59 | // RRC E 60 | opcodesRRC(de.GetLowReg()) 61 | } 62 | 63 | func opcodeCB0x0C() { 64 | // RRC H 65 | opcodesRRC(hl.GetHighReg()) 66 | } 67 | 68 | func opcodeCB0x0D() { 69 | // RRC L 70 | opcodesRRC(hl.GetLowReg()) 71 | } 72 | 73 | func opcodeCB0x0E() { 74 | // RRC (HL) 75 | opcodesRRCHL() 76 | } 77 | 78 | func opcodeCB0x0F() { 79 | // RRC A 80 | opcodesRRC(af.GetHighReg()) 81 | } 82 | 83 | func opcodeCB0x10() { 84 | // RL B 85 | opcodesRL(bc.GetHighReg()) 86 | } 87 | 88 | func opcodeCB0x11() { 89 | // RL C 90 | opcodesRL(bc.GetLowReg()) 91 | } 92 | 93 | func opcodeCB0x12() { 94 | // RL D 95 | opcodesRL(de.GetHighReg()) 96 | } 97 | 98 | func opcodeCB0x13() { 99 | // RL E 100 | opcodesRL(de.GetLowReg()) 101 | } 102 | 103 | func opcodeCB0x14() { 104 | // RL H 105 | opcodesRL(hl.GetHighReg()) 106 | } 107 | 108 | func opcodeCB0x15() { 109 | // RL L 110 | opcodesRL(hl.GetLowReg()) 111 | } 112 | 113 | func opcodeCB0x16() { 114 | // RL (HL) 115 | opcodesRLHL() 116 | } 117 | 118 | func opcodeCB0x17() { 119 | // RL A 120 | opcodesRL(af.GetHighReg()) 121 | } 122 | 123 | func opcodeCB0x18() { 124 | // RR B 125 | opcodesRR(bc.GetHighReg()) 126 | } 127 | 128 | func opcodeCB0x19() { 129 | // RR C 130 | opcodesRR(bc.GetLowReg()) 131 | } 132 | 133 | func opcodeCB0x1A() { 134 | // RR D 135 | opcodesRR(de.GetHighReg()) 136 | } 137 | 138 | func opcodeCB0x1B() { 139 | // RR E 140 | opcodesRR(de.GetLowReg()) 141 | } 142 | 143 | func opcodeCB0x1C() { 144 | // RR H 145 | opcodesRR(hl.GetHighReg()) 146 | } 147 | 148 | func opcodeCB0x1D() { 149 | // RR L 150 | opcodesRR(hl.GetLowReg()) 151 | } 152 | 153 | func opcodeCB0x1E() { 154 | // RR (HL) 155 | opcodesRRHL() 156 | } 157 | 158 | func opcodeCB0x1F() { 159 | // RR A 160 | opcodesRR(af.GetHighReg()) 161 | } 162 | 163 | func opcodeCB0x20() { 164 | // SLA B 165 | opcodesSLA(bc.GetHighReg()) 166 | } 167 | 168 | func opcodeCB0x21() { 169 | // SLA C 170 | opcodesSLA(bc.GetLowReg()) 171 | } 172 | 173 | func opcodeCB0x22() { 174 | // SLA D 175 | opcodesSLA(de.GetHighReg()) 176 | } 177 | 178 | func opcodeCB0x23() { 179 | // SLA E 180 | opcodesSLA(de.GetLowReg()) 181 | } 182 | 183 | func opcodeCB0x24() { 184 | // SLA H 185 | opcodesSLA(hl.GetHighReg()) 186 | } 187 | 188 | func opcodeCB0x25() { 189 | // SLA L 190 | opcodesSLA(hl.GetLowReg()) 191 | } 192 | 193 | func opcodeCB0x26() { 194 | // SLA (HL) 195 | opcodesSLAHL() 196 | } 197 | 198 | func opcodeCB0x27() { 199 | // SLA A 200 | opcodesSLA(af.GetHighReg()) 201 | } 202 | 203 | func opcodeCB0x28() { 204 | // SRA B 205 | opcodesSRA(bc.GetHighReg()) 206 | } 207 | 208 | func opcodeCB0x29() { 209 | // SRA C 210 | opcodesSRA(bc.GetLowReg()) 211 | } 212 | 213 | func opcodeCB0x2A() { 214 | // SRA D 215 | opcodesSRA(de.GetHighReg()) 216 | } 217 | 218 | func opcodeCB0x2B() { 219 | // SRA E 220 | opcodesSRA(de.GetLowReg()) 221 | } 222 | 223 | func opcodeCB0x2C() { 224 | // SRA H 225 | opcodesSRA(hl.GetHighReg()) 226 | } 227 | 228 | func opcodeCB0x2D() { 229 | // SRA L 230 | opcodesSRA(hl.GetLowReg()) 231 | } 232 | 233 | func opcodeCB0x2E() { 234 | // SRA (HL) 235 | opcodesSRAHL() 236 | } 237 | 238 | func opcodeCB0x2F() { 239 | // SRA A 240 | opcodesSRA(af.GetHighReg()) 241 | } 242 | 243 | func opcodeCB0x30() { 244 | // SWAP B 245 | opcodesSWAPReg(bc.GetHighReg()) 246 | } 247 | 248 | func opcodeCB0x31() { 249 | // SWAP C 250 | opcodesSWAPReg(bc.GetLowReg()) 251 | } 252 | 253 | func opcodeCB0x32() { 254 | // SWAP D 255 | opcodesSWAPReg(de.GetHighReg()) 256 | } 257 | 258 | func opcodeCB0x33() { 259 | // SWAP E 260 | opcodesSWAPReg(de.GetLowReg()) 261 | } 262 | 263 | func opcodeCB0x34() { 264 | // SWAP H 265 | opcodesSWAPReg(hl.GetHighReg()) 266 | } 267 | 268 | func opcodeCB0x35() { 269 | // SWAP L 270 | opcodesSWAPReg(hl.GetLowReg()) 271 | } 272 | 273 | func opcodeCB0x36() { 274 | // SWAP (HL) 275 | opcodesSWAPHL() 276 | } 277 | 278 | func opcodeCB0x37() { 279 | // SWAP A 280 | opcodesSWAPReg(af.GetHighReg()) 281 | } 282 | 283 | func opcodeCB0x38() { 284 | // SRL B 285 | opcodesSRL(bc.GetHighReg()) 286 | } 287 | 288 | func opcodeCB0x39() { 289 | // SRL C 290 | opcodesSRL(bc.GetLowReg()) 291 | } 292 | 293 | func opcodeCB0x3A() { 294 | // SRL D 295 | opcodesSRL(de.GetHighReg()) 296 | } 297 | 298 | func opcodeCB0x3B() { 299 | // SRL E 300 | opcodesSRL(de.GetLowReg()) 301 | } 302 | 303 | func opcodeCB0x3C() { 304 | // SRL H 305 | opcodesSRL(hl.GetHighReg()) 306 | } 307 | 308 | func opcodeCB0x3D() { 309 | // SRL L 310 | opcodesSRL(hl.GetLowReg()) 311 | } 312 | 313 | func opcodeCB0x3E() { 314 | // SRL (HL) 315 | opcodesSRLHL() 316 | } 317 | 318 | func opcodeCB0x3F() { 319 | // SRL A 320 | opcodesSRL(af.GetHighReg()) 321 | } 322 | 323 | func opcodeCB0x40() { 324 | // BIT 0 B 325 | opcodesBIT(bc.GetHighReg(), 0) 326 | } 327 | 328 | func opcodeCB0x41() { 329 | // BIT 0 C 330 | opcodesBIT(bc.GetLowReg(), 0) 331 | } 332 | 333 | func opcodeCB0x42() { 334 | // BIT 0 D 335 | opcodesBIT(de.GetHighReg(), 0) 336 | } 337 | 338 | func opcodeCB0x43() { 339 | // BIT 0 E 340 | opcodesBIT(de.GetLowReg(), 0) 341 | } 342 | 343 | func opcodeCB0x44() { 344 | // BIT 0 H 345 | opcodesBIT(hl.GetHighReg(), 0) 346 | } 347 | 348 | func opcodeCB0x45() { 349 | // BIT 0 L 350 | opcodesBIT(hl.GetLowReg(), 0) 351 | } 352 | 353 | func opcodeCB0x46() { 354 | // BIT 0 (HL) 355 | opcodesBITHL(0) 356 | } 357 | 358 | func opcodeCB0x47() { 359 | // BIT 0 A 360 | opcodesBIT(af.GetHighReg(), 0) 361 | } 362 | 363 | func opcodeCB0x48() { 364 | // BIT 1 B 365 | opcodesBIT(bc.GetHighReg(), 1) 366 | } 367 | 368 | func opcodeCB0x49() { 369 | // BIT 1 C 370 | opcodesBIT(bc.GetLowReg(), 1) 371 | } 372 | 373 | func opcodeCB0x4A() { 374 | // BIT 1 D 375 | opcodesBIT(de.GetHighReg(), 1) 376 | } 377 | 378 | func opcodeCB0x4B() { 379 | // BIT 1 E 380 | opcodesBIT(de.GetLowReg(), 1) 381 | } 382 | 383 | func opcodeCB0x4C() { 384 | // BIT 1 H 385 | opcodesBIT(hl.GetHighReg(), 1) 386 | } 387 | 388 | func opcodeCB0x4D() { 389 | // BIT 1 L 390 | opcodesBIT(hl.GetLowReg(), 1) 391 | } 392 | 393 | func opcodeCB0x4E() { 394 | // BIT 1 (HL) 395 | opcodesBITHL(1) 396 | } 397 | 398 | func opcodeCB0x4F() { 399 | // BIT 1 A 400 | opcodesBIT(af.GetHighReg(), 1) 401 | } 402 | 403 | func opcodeCB0x50() { 404 | // BIT 2 B 405 | opcodesBIT(bc.GetHighReg(), 2) 406 | } 407 | 408 | func opcodeCB0x51() { 409 | // BIT 2 C 410 | opcodesBIT(bc.GetLowReg(), 2) 411 | } 412 | 413 | func opcodeCB0x52() { 414 | // BIT 2 D 415 | opcodesBIT(de.GetHighReg(), 2) 416 | } 417 | 418 | func opcodeCB0x53() { 419 | // BIT 2 E 420 | opcodesBIT(de.GetLowReg(), 2) 421 | } 422 | 423 | func opcodeCB0x54() { 424 | // BIT 2 H 425 | opcodesBIT(hl.GetHighReg(), 2) 426 | } 427 | 428 | func opcodeCB0x55() { 429 | // BIT 2 L 430 | opcodesBIT(hl.GetLowReg(), 2) 431 | } 432 | 433 | func opcodeCB0x56() { 434 | // BIT 2 (HL) 435 | opcodesBITHL(2) 436 | } 437 | 438 | func opcodeCB0x57() { 439 | // BIT 2 A 440 | opcodesBIT(af.GetHighReg(), 2) 441 | } 442 | 443 | func opcodeCB0x58() { 444 | // BIT 3 B 445 | opcodesBIT(bc.GetHighReg(), 3) 446 | } 447 | 448 | func opcodeCB0x59() { 449 | // BIT 3 C 450 | opcodesBIT(bc.GetLowReg(), 3) 451 | } 452 | 453 | func opcodeCB0x5A() { 454 | // BIT 3 D 455 | opcodesBIT(de.GetHighReg(), 3) 456 | } 457 | 458 | func opcodeCB0x5B() { 459 | // BIT 3 E 460 | opcodesBIT(de.GetLowReg(), 3) 461 | } 462 | 463 | func opcodeCB0x5C() { 464 | // BIT 3 H 465 | opcodesBIT(hl.GetHighReg(), 3) 466 | } 467 | 468 | func opcodeCB0x5D() { 469 | // BIT 3 L 470 | opcodesBIT(hl.GetLowReg(), 3) 471 | } 472 | 473 | func opcodeCB0x5E() { 474 | // BIT 3 (HL) 475 | opcodesBITHL(3) 476 | } 477 | 478 | func opcodeCB0x5F() { 479 | // BIT 3 A 480 | opcodesBIT(af.GetHighReg(), 3) 481 | } 482 | 483 | func opcodeCB0x60() { 484 | // BIT 4 B 485 | opcodesBIT(bc.GetHighReg(), 4) 486 | } 487 | 488 | func opcodeCB0x61() { 489 | // BIT 4 C 490 | opcodesBIT(bc.GetLowReg(), 4) 491 | } 492 | 493 | func opcodeCB0x62() { 494 | // BIT 4 D 495 | opcodesBIT(de.GetHighReg(), 4) 496 | } 497 | 498 | func opcodeCB0x63() { 499 | // BIT 4 E 500 | opcodesBIT(de.GetLowReg(), 4) 501 | } 502 | 503 | func opcodeCB0x64() { 504 | // BIT 4 H 505 | opcodesBIT(hl.GetHighReg(), 4) 506 | } 507 | 508 | func opcodeCB0x65() { 509 | // BIT 4 L 510 | opcodesBIT(hl.GetLowReg(), 4) 511 | } 512 | 513 | func opcodeCB0x66() { 514 | // BIT 4 (HL) 515 | opcodesBITHL(4) 516 | } 517 | 518 | func opcodeCB0x67() { 519 | // BIT 4 A 520 | opcodesBIT(af.GetHighReg(), 4) 521 | } 522 | 523 | func opcodeCB0x68() { 524 | // BIT 5 B 525 | opcodesBIT(bc.GetHighReg(), 5) 526 | } 527 | 528 | func opcodeCB0x69() { 529 | // BIT 5 C 530 | opcodesBIT(bc.GetLowReg(), 5) 531 | } 532 | 533 | func opcodeCB0x6A() { 534 | // BIT 5 D 535 | opcodesBIT(de.GetHighReg(), 5) 536 | } 537 | 538 | func opcodeCB0x6B() { 539 | // BIT 5 E 540 | opcodesBIT(de.GetLowReg(), 5) 541 | } 542 | 543 | func opcodeCB0x6C() { 544 | // BIT 5 H 545 | opcodesBIT(hl.GetHighReg(), 5) 546 | } 547 | 548 | func opcodeCB0x6D() { 549 | // BIT 5 L 550 | opcodesBIT(hl.GetLowReg(), 5) 551 | } 552 | 553 | func opcodeCB0x6E() { 554 | // BIT 5 (HL) 555 | opcodesBITHL(5) 556 | } 557 | 558 | func opcodeCB0x6F() { 559 | // BIT 5 A 560 | opcodesBIT(af.GetHighReg(), 5) 561 | } 562 | 563 | func opcodeCB0x70() { 564 | // BIT 6 B 565 | opcodesBIT(bc.GetHighReg(), 6) 566 | } 567 | 568 | func opcodeCB0x71() { 569 | // BIT 6 C 570 | opcodesBIT(bc.GetLowReg(), 6) 571 | } 572 | 573 | func opcodeCB0x72() { 574 | // BIT 6 D 575 | opcodesBIT(de.GetHighReg(), 6) 576 | } 577 | 578 | func opcodeCB0x73() { 579 | // BIT 6 E 580 | opcodesBIT(de.GetLowReg(), 6) 581 | } 582 | 583 | func opcodeCB0x74() { 584 | // BIT 6 H 585 | opcodesBIT(hl.GetHighReg(), 6) 586 | } 587 | 588 | func opcodeCB0x75() { 589 | // BIT 6 L 590 | opcodesBIT(hl.GetLowReg(), 6) 591 | } 592 | 593 | func opcodeCB0x76() { 594 | // BIT 6 (HL) 595 | opcodesBITHL(6) 596 | } 597 | 598 | func opcodeCB0x77() { 599 | // BIT 6 A 600 | opcodesBIT(af.GetHighReg(), 6) 601 | } 602 | 603 | func opcodeCB0x78() { 604 | // BIT 7 B 605 | opcodesBIT(bc.GetHighReg(), 7) 606 | } 607 | 608 | func opcodeCB0x79() { 609 | // BIT 7 C 610 | opcodesBIT(bc.GetLowReg(), 7) 611 | } 612 | 613 | func opcodeCB0x7A() { 614 | // BIT 7 D 615 | opcodesBIT(de.GetHighReg(), 7) 616 | } 617 | 618 | func opcodeCB0x7B() { 619 | // BIT 7 E 620 | opcodesBIT(de.GetLowReg(), 7) 621 | } 622 | 623 | func opcodeCB0x7C() { 624 | // BIT 7 H 625 | opcodesBIT(hl.GetHighReg(), 7) 626 | } 627 | 628 | func opcodeCB0x7D() { 629 | // BIT 7 L 630 | opcodesBIT(hl.GetLowReg(), 7) 631 | } 632 | 633 | func opcodeCB0x7E() { 634 | // BIT 7 (HL) 635 | opcodesBITHL(7) 636 | } 637 | 638 | func opcodeCB0x7F() { 639 | // BIT 7 A 640 | opcodesBIT(af.GetHighReg(), 7) 641 | } 642 | 643 | func opcodeCB0x80() { 644 | // RES 0 B 645 | opcodesRES(bc.GetHighReg(), 0) 646 | } 647 | 648 | func opcodeCB0x81() { 649 | // RES 0 C 650 | opcodesRES(bc.GetLowReg(), 0) 651 | } 652 | 653 | func opcodeCB0x82() { 654 | // RES 0 D 655 | opcodesRES(de.GetHighReg(), 0) 656 | } 657 | 658 | func opcodeCB0x83() { 659 | // RES 0 E 660 | opcodesRES(de.GetLowReg(), 0) 661 | } 662 | 663 | func opcodeCB0x84() { 664 | // RES 0 H 665 | opcodesRES(hl.GetHighReg(), 0) 666 | } 667 | 668 | func opcodeCB0x85() { 669 | // RES 0 L 670 | opcodesRES(hl.GetLowReg(), 0) 671 | } 672 | 673 | func opcodeCB0x86() { 674 | // RES 0 (HL) 675 | opcodesRESHL(0) 676 | } 677 | 678 | func opcodeCB0x87() { 679 | // RES 0 A 680 | opcodesRES(af.GetHighReg(), 0) 681 | } 682 | 683 | func opcodeCB0x88() { 684 | // RES 1 B 685 | opcodesRES(bc.GetHighReg(), 1) 686 | } 687 | 688 | func opcodeCB0x89() { 689 | // RES 1 C 690 | opcodesRES(bc.GetLowReg(), 1) 691 | } 692 | 693 | func opcodeCB0x8A() { 694 | // RES 1 D 695 | opcodesRES(de.GetHighReg(), 1) 696 | } 697 | 698 | func opcodeCB0x8B() { 699 | // RES 1 E 700 | opcodesRES(de.GetLowReg(), 1) 701 | } 702 | 703 | func opcodeCB0x8C() { 704 | // RES 1 H 705 | opcodesRES(hl.GetHighReg(), 1) 706 | } 707 | 708 | func opcodeCB0x8D() { 709 | // RES 1 L 710 | opcodesRES(hl.GetLowReg(), 1) 711 | } 712 | 713 | func opcodeCB0x8E() { 714 | // RES 1 (HL) 715 | opcodesRESHL(1) 716 | } 717 | 718 | func opcodeCB0x8F() { 719 | // RES 1 A 720 | opcodesRES(af.GetHighReg(), 1) 721 | } 722 | 723 | func opcodeCB0x90() { 724 | // RES 2 B 725 | opcodesRES(bc.GetHighReg(), 2) 726 | } 727 | 728 | func opcodeCB0x91() { 729 | // RES 2 C 730 | opcodesRES(bc.GetLowReg(), 2) 731 | } 732 | 733 | func opcodeCB0x92() { 734 | // RES 2 D 735 | opcodesRES(de.GetHighReg(), 2) 736 | } 737 | 738 | func opcodeCB0x93() { 739 | // RES 2 E 740 | opcodesRES(de.GetLowReg(), 2) 741 | } 742 | 743 | func opcodeCB0x94() { 744 | // RES 2 H 745 | opcodesRES(hl.GetHighReg(), 2) 746 | } 747 | 748 | func opcodeCB0x95() { 749 | // RES 2 L 750 | opcodesRES(hl.GetLowReg(), 2) 751 | } 752 | 753 | func opcodeCB0x96() { 754 | // RES 2 (HL) 755 | opcodesRESHL(2) 756 | } 757 | 758 | func opcodeCB0x97() { 759 | // RES 2 A 760 | opcodesRES(af.GetHighReg(), 2) 761 | } 762 | 763 | func opcodeCB0x98() { 764 | // RES 3 B 765 | opcodesRES(bc.GetHighReg(), 3) 766 | } 767 | 768 | func opcodeCB0x99() { 769 | // RES 3 C 770 | opcodesRES(bc.GetLowReg(), 3) 771 | } 772 | 773 | func opcodeCB0x9A() { 774 | // RES 3 D 775 | opcodesRES(de.GetHighReg(), 3) 776 | } 777 | 778 | func opcodeCB0x9B() { 779 | // RES 3 E 780 | opcodesRES(de.GetLowReg(), 3) 781 | } 782 | 783 | func opcodeCB0x9C() { 784 | // RES 3 H 785 | opcodesRES(hl.GetHighReg(), 3) 786 | } 787 | 788 | func opcodeCB0x9D() { 789 | // RES 3 L 790 | opcodesRES(hl.GetLowReg(), 3) 791 | } 792 | 793 | func opcodeCB0x9E() { 794 | // RES 3 (HL) 795 | opcodesRESHL(3) 796 | } 797 | 798 | func opcodeCB0x9F() { 799 | // RES 3 A 800 | opcodesRES(af.GetHighReg(), 3) 801 | } 802 | 803 | func opcodeCB0xA0() { 804 | // RES 4 B 805 | opcodesRES(bc.GetHighReg(), 4) 806 | } 807 | 808 | func opcodeCB0xA1() { 809 | // RES 4 C 810 | opcodesRES(bc.GetLowReg(), 4) 811 | } 812 | 813 | func opcodeCB0xA2() { 814 | // RES 4 D 815 | opcodesRES(de.GetHighReg(), 4) 816 | } 817 | 818 | func opcodeCB0xA3() { 819 | // RES 4 E 820 | opcodesRES(de.GetLowReg(), 4) 821 | } 822 | 823 | func opcodeCB0xA4() { 824 | // RES 4 H 825 | opcodesRES(hl.GetHighReg(), 4) 826 | } 827 | 828 | func opcodeCB0xA5() { 829 | // RES 4 L 830 | opcodesRES(hl.GetLowReg(), 4) 831 | } 832 | 833 | func opcodeCB0xA6() { 834 | // RES 4 (HL) 835 | opcodesRESHL(4) 836 | } 837 | 838 | func opcodeCB0xA7() { 839 | // RES 4 A 840 | opcodesRES(af.GetHighReg(), 4) 841 | } 842 | 843 | func opcodeCB0xA8() { 844 | // RES 5 B 845 | opcodesRES(bc.GetHighReg(), 5) 846 | } 847 | 848 | func opcodeCB0xA9() { 849 | // RES 5 C 850 | opcodesRES(bc.GetLowReg(), 5) 851 | } 852 | 853 | func opcodeCB0xAA() { 854 | // RES 5 D 855 | opcodesRES(de.GetHighReg(), 5) 856 | } 857 | 858 | func opcodeCB0xAB() { 859 | // RES 5 E 860 | opcodesRES(de.GetLowReg(), 5) 861 | } 862 | 863 | func opcodeCB0xAC() { 864 | // RES 5 H 865 | opcodesRES(hl.GetHighReg(), 5) 866 | } 867 | 868 | func opcodeCB0xAD() { 869 | // RES 5 L 870 | opcodesRES(hl.GetLowReg(), 5) 871 | } 872 | 873 | func opcodeCB0xAE() { 874 | // RES 5 (HL) 875 | opcodesRESHL(5) 876 | } 877 | 878 | func opcodeCB0xAF() { 879 | // RES 5 A 880 | opcodesRES(af.GetHighReg(), 5) 881 | } 882 | 883 | func opcodeCB0xB0() { 884 | // RES 6 B 885 | opcodesRES(bc.GetHighReg(), 6) 886 | } 887 | 888 | func opcodeCB0xB1() { 889 | // RES 6 C 890 | opcodesRES(bc.GetLowReg(), 6) 891 | } 892 | 893 | func opcodeCB0xB2() { 894 | // RES 6 D 895 | opcodesRES(de.GetHighReg(), 6) 896 | } 897 | 898 | func opcodeCB0xB3() { 899 | // RES 6 E 900 | opcodesRES(de.GetLowReg(), 6) 901 | } 902 | 903 | func opcodeCB0xB4() { 904 | // RES 6 H 905 | opcodesRES(hl.GetHighReg(), 6) 906 | } 907 | 908 | func opcodeCB0xB5() { 909 | // RES 6 L 910 | opcodesRES(hl.GetLowReg(), 6) 911 | } 912 | 913 | func opcodeCB0xB6() { 914 | // RES 6 (HL) 915 | opcodesRESHL(6) 916 | } 917 | 918 | func opcodeCB0xB7() { 919 | // RES 6 A 920 | opcodesRES(af.GetHighReg(), 6) 921 | } 922 | 923 | func opcodeCB0xB8() { 924 | // RES 7 B 925 | opcodesRES(bc.GetHighReg(), 7) 926 | } 927 | 928 | func opcodeCB0xB9() { 929 | // RES 7 C 930 | opcodesRES(bc.GetLowReg(), 7) 931 | } 932 | 933 | func opcodeCB0xBA() { 934 | // RES 7 D 935 | opcodesRES(de.GetHighReg(), 7) 936 | } 937 | 938 | func opcodeCB0xBB() { 939 | // RES 7 E 940 | opcodesRES(de.GetLowReg(), 7) 941 | } 942 | 943 | func opcodeCB0xBC() { 944 | // RES 7 H 945 | opcodesRES(hl.GetHighReg(), 7) 946 | } 947 | 948 | func opcodeCB0xBD() { 949 | // RES 7 L 950 | opcodesRES(hl.GetLowReg(), 7) 951 | } 952 | 953 | func opcodeCB0xBE() { 954 | // RES 7 (HL) 955 | opcodesRESHL(7) 956 | } 957 | 958 | func opcodeCB0xBF() { 959 | // RES 7 A 960 | opcodesRES(af.GetHighReg(), 7) 961 | } 962 | 963 | func opcodeCB0xC0() { 964 | // SET 0 B 965 | opcodesSET(bc.GetHighReg(), 0) 966 | } 967 | 968 | func opcodeCB0xC1() { 969 | // SET 0 C 970 | opcodesSET(bc.GetLowReg(), 0) 971 | } 972 | 973 | func opcodeCB0xC2() { 974 | // SET 0 D 975 | opcodesSET(de.GetHighReg(), 0) 976 | } 977 | 978 | func opcodeCB0xC3() { 979 | // SET 0 E 980 | opcodesSET(de.GetLowReg(), 0) 981 | } 982 | 983 | func opcodeCB0xC4() { 984 | // SET 0 H 985 | opcodesSET(hl.GetHighReg(), 0) 986 | } 987 | 988 | func opcodeCB0xC5() { 989 | // SET 0 L 990 | opcodesSET(hl.GetLowReg(), 0) 991 | } 992 | 993 | func opcodeCB0xC6() { 994 | // SET 0 (HL) 995 | opcodesSETHL(0) 996 | } 997 | 998 | func opcodeCB0xC7() { 999 | // SET 0 A 1000 | opcodesSET(af.GetHighReg(), 0) 1001 | } 1002 | 1003 | func opcodeCB0xC8() { 1004 | // SET 1 B 1005 | opcodesSET(bc.GetHighReg(), 1) 1006 | } 1007 | 1008 | func opcodeCB0xC9() { 1009 | // SET 1 C 1010 | opcodesSET(bc.GetLowReg(), 1) 1011 | } 1012 | 1013 | func opcodeCB0xCA() { 1014 | // SET 1 D 1015 | opcodesSET(de.GetHighReg(), 1) 1016 | } 1017 | 1018 | func opcodeCB0xCB() { 1019 | // SET 1 E 1020 | opcodesSET(de.GetLowReg(), 1) 1021 | } 1022 | 1023 | func opcodeCB0xCC() { 1024 | // SET 1 H 1025 | opcodesSET(hl.GetHighReg(), 1) 1026 | } 1027 | 1028 | func opcodeCB0xCD() { 1029 | // SET 1 L 1030 | opcodesSET(hl.GetLowReg(), 1) 1031 | } 1032 | 1033 | func opcodeCB0xCE() { 1034 | // SET 1 (HL) 1035 | opcodesSETHL(1) 1036 | } 1037 | 1038 | func opcodeCB0xCF() { 1039 | // SET 1 A 1040 | opcodesSET(af.GetHighReg(), 1) 1041 | } 1042 | 1043 | func opcodeCB0xD0() { 1044 | // SET 2 B 1045 | opcodesSET(bc.GetHighReg(), 2) 1046 | } 1047 | 1048 | func opcodeCB0xD1() { 1049 | // SET 2 C 1050 | opcodesSET(bc.GetLowReg(), 2) 1051 | } 1052 | 1053 | func opcodeCB0xD2() { 1054 | // SET 2 D 1055 | opcodesSET(de.GetHighReg(), 2) 1056 | } 1057 | 1058 | func opcodeCB0xD3() { 1059 | // SET 2 E 1060 | opcodesSET(de.GetLowReg(), 2) 1061 | } 1062 | 1063 | func opcodeCB0xD4() { 1064 | // SET 2 H 1065 | opcodesSET(hl.GetHighReg(), 2) 1066 | } 1067 | 1068 | func opcodeCB0xD5() { 1069 | // SET 2 L 1070 | opcodesSET(hl.GetLowReg(), 2) 1071 | } 1072 | 1073 | func opcodeCB0xD6() { 1074 | // SET 2 (HL) 1075 | opcodesSETHL(2) 1076 | } 1077 | 1078 | func opcodeCB0xD7() { 1079 | // SET 2 A 1080 | opcodesSET(af.GetHighReg(), 2) 1081 | } 1082 | 1083 | func opcodeCB0xD8() { 1084 | // SET 3 B 1085 | opcodesSET(bc.GetHighReg(), 3) 1086 | } 1087 | 1088 | func opcodeCB0xD9() { 1089 | // SET 3 C 1090 | opcodesSET(bc.GetLowReg(), 3) 1091 | } 1092 | 1093 | func opcodeCB0xDA() { 1094 | // SET 3 D 1095 | opcodesSET(de.GetHighReg(), 3) 1096 | } 1097 | 1098 | func opcodeCB0xDB() { 1099 | // SET 3 E 1100 | opcodesSET(de.GetLowReg(), 3) 1101 | } 1102 | 1103 | func opcodeCB0xDC() { 1104 | // SET 3 H 1105 | opcodesSET(hl.GetHighReg(), 3) 1106 | } 1107 | 1108 | func opcodeCB0xDD() { 1109 | // SET 3 L 1110 | opcodesSET(hl.GetLowReg(), 3) 1111 | } 1112 | 1113 | func opcodeCB0xDE() { 1114 | // SET 3 (HL) 1115 | opcodesSETHL(3) 1116 | } 1117 | 1118 | func opcodeCB0xDF() { 1119 | // SET 3 A 1120 | opcodesSET(af.GetHighReg(), 3) 1121 | } 1122 | 1123 | func opcodeCB0xE0() { 1124 | // SET 4 B 1125 | opcodesSET(bc.GetHighReg(), 4) 1126 | } 1127 | 1128 | func opcodeCB0xE1() { 1129 | // SET 4 C 1130 | opcodesSET(bc.GetLowReg(), 4) 1131 | } 1132 | 1133 | func opcodeCB0xE2() { 1134 | // SET 4 D 1135 | opcodesSET(de.GetHighReg(), 4) 1136 | } 1137 | 1138 | func opcodeCB0xE3() { 1139 | // SET 4 E 1140 | opcodesSET(de.GetLowReg(), 4) 1141 | } 1142 | 1143 | func opcodeCB0xE4() { 1144 | // SET 4 H 1145 | opcodesSET(hl.GetHighReg(), 4) 1146 | } 1147 | 1148 | func opcodeCB0xE5() { 1149 | // SET 4 L 1150 | opcodesSET(hl.GetLowReg(), 4) 1151 | } 1152 | 1153 | func opcodeCB0xE6() { 1154 | // SET 4 (HL) 1155 | opcodesSETHL(4) 1156 | } 1157 | 1158 | func opcodeCB0xE7() { 1159 | // SET 4 A 1160 | opcodesSET(af.GetHighReg(), 4) 1161 | 1162 | } 1163 | 1164 | func opcodeCB0xE8() { 1165 | // SET 5 B 1166 | opcodesSET(bc.GetHighReg(), 5) 1167 | } 1168 | 1169 | func opcodeCB0xE9() { 1170 | // SET 5 C 1171 | opcodesSET(bc.GetLowReg(), 5) 1172 | } 1173 | 1174 | func opcodeCB0xEA() { 1175 | // SET 5 D 1176 | opcodesSET(de.GetHighReg(), 5) 1177 | } 1178 | 1179 | func opcodeCB0xEB() { 1180 | // SET 5 E 1181 | opcodesSET(de.GetLowReg(), 5) 1182 | } 1183 | 1184 | func opcodeCB0xEC() { 1185 | // SET 5 H 1186 | opcodesSET(hl.GetHighReg(), 5) 1187 | } 1188 | 1189 | func opcodeCB0xED() { 1190 | // SET 5 L 1191 | opcodesSET(hl.GetLowReg(), 5) 1192 | } 1193 | 1194 | func opcodeCB0xEE() { 1195 | // SET 5 (HL) 1196 | opcodesSETHL(5) 1197 | } 1198 | 1199 | func opcodeCB0xEF() { 1200 | // SET 5 A 1201 | opcodesSET(af.GetHighReg(), 5) 1202 | } 1203 | 1204 | func opcodeCB0xF0() { 1205 | // SET 6 B 1206 | opcodesSET(bc.GetHighReg(), 6) 1207 | } 1208 | 1209 | func opcodeCB0xF1() { 1210 | // SET 6 C 1211 | opcodesSET(bc.GetLowReg(), 6) 1212 | } 1213 | 1214 | func opcodeCB0xF2() { 1215 | // SET 6 D 1216 | opcodesSET(de.GetHighReg(), 6) 1217 | } 1218 | 1219 | func opcodeCB0xF3() { 1220 | // SET 6 E 1221 | opcodesSET(de.GetLowReg(), 6) 1222 | } 1223 | 1224 | func opcodeCB0xF4() { 1225 | // SET 6 H 1226 | opcodesSET(hl.GetHighReg(), 6) 1227 | } 1228 | 1229 | func opcodeCB0xF5() { 1230 | // SET 6 L 1231 | opcodesSET(hl.GetLowReg(), 6) 1232 | } 1233 | 1234 | func opcodeCB0xF6() { 1235 | // SET 6 (HL) 1236 | opcodesSETHL(6) 1237 | } 1238 | 1239 | func opcodeCB0xF7() { 1240 | // SET 6 A 1241 | opcodesSET(af.GetHighReg(), 6) 1242 | } 1243 | 1244 | func opcodeCB0xF8() { 1245 | // SET 7 B 1246 | opcodesSET(bc.GetHighReg(), 7) 1247 | } 1248 | 1249 | func opcodeCB0xF9() { 1250 | // SET 7 C 1251 | opcodesSET(bc.GetLowReg(), 7) 1252 | } 1253 | 1254 | func opcodeCB0xFA() { 1255 | // SET 7 D 1256 | opcodesSET(de.GetHighReg(), 7) 1257 | } 1258 | 1259 | func opcodeCB0xFB() { 1260 | // SET 7 E 1261 | opcodesSET(de.GetLowReg(), 7) 1262 | } 1263 | 1264 | func opcodeCB0xFC() { 1265 | // SET 7 H 1266 | opcodesSET(hl.GetHighReg(), 7) 1267 | } 1268 | 1269 | func opcodeCB0xFD() { 1270 | // SET 7 L 1271 | opcodesSET(hl.GetLowReg(), 7) 1272 | } 1273 | 1274 | func opcodeCB0xFE() { 1275 | // SET 7 (HL) 1276 | opcodesSETHL(7) 1277 | } 1278 | 1279 | func opcodeCB0xFF() { 1280 | // SET 7 A 1281 | opcodesSET(af.GetHighReg(), 7) 1282 | } 1283 | -------------------------------------------------------------------------------- /gb/cpu/common.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | import "fmt" 4 | 5 | func clearAllFlags() { 6 | initFlagReg(flagNone) 7 | } 8 | 9 | func setZeroFlagFromResult(result uint8) { 10 | if result == 0 { 11 | setFlag(flagZero) 12 | } 13 | } 14 | 15 | func initFlagReg(flag uint8) { 16 | af.SetLow(flag) 17 | } 18 | 19 | func flipFlag(flag uint8) { 20 | af.SetLow(af.GetLow() ^ flag) 21 | } 22 | 23 | func setFlag(flag uint8) { 24 | af.SetLow(af.GetLow() | flag) 25 | } 26 | 27 | func resetFlag(flag uint8) { 28 | af.SetLow(af.GetLow() &^ flag) 29 | } 30 | 31 | func isSetFlag(flag uint8) bool { 32 | return (af.GetLow() & flag) != 0 33 | } 34 | 35 | func stackPush(reg *SixteenBitReg) { 36 | sp.Decrement() 37 | mem.Write(sp.GetValue(), reg.GetHigh()) 38 | sp.Decrement() 39 | mem.Write(sp.GetValue(), reg.GetLow()) 40 | } 41 | 42 | func stackPop(reg *SixteenBitReg) { 43 | reg.SetLow(mem.Read(sp.GetValue())) 44 | sp.Increment() 45 | reg.SetHigh(mem.Read(sp.GetValue())) 46 | sp.Increment() 47 | } 48 | 49 | func invalidOPCode() { 50 | fmt.Println("INVALID opcode") 51 | } 52 | 53 | func opcodesLDValueToReg(reg1 *EightBitReg, value uint8) { 54 | reg1.SetValue(value) 55 | } 56 | 57 | func opcodesLDAddrToReg(reg *EightBitReg, address uint16) { 58 | reg.SetValue(mem.Read(address)) 59 | } 60 | 61 | func opcodesLDValueToAddr(address uint16, value uint8) { 62 | mem.Write(address, value) 63 | } 64 | 65 | func opcodesOR(number uint8) { 66 | result := af.GetHigh() | number 67 | af.SetHigh(result) 68 | clearAllFlags() 69 | setZeroFlagFromResult(result) 70 | } 71 | 72 | func opcodesXOR(number uint8) { 73 | result := af.GetHigh() ^ number 74 | af.SetHigh(result) 75 | clearAllFlags() 76 | setZeroFlagFromResult(result) 77 | } 78 | 79 | func opcodesAND(number uint8) { 80 | result := af.GetHigh() & number 81 | af.SetHigh(result) 82 | if result == 0 { 83 | setFlag(flagZero) 84 | } else { 85 | resetFlag(flagZero) 86 | } 87 | resetFlag(flagNegative) 88 | setFlag(flagHalf) 89 | resetFlag(flagCarry) 90 | } 91 | 92 | func opcodesCP(number uint8) { 93 | initFlagReg(flagNegative) 94 | if af.GetHigh() < number { 95 | setFlag(flagCarry) 96 | } else if af.GetHigh() == number { 97 | setFlag(flagZero) 98 | } 99 | if ((af.GetHigh() - number) & 0xF) > (af.GetHigh() & 0xF) { 100 | setFlag(flagHalf) 101 | } 102 | } 103 | 104 | func opcodesINC(reg *EightBitReg) { 105 | result := reg.GetValue() + 1 106 | reg.SetValue(result) 107 | if result == 0 { 108 | setFlag(flagZero) 109 | } else { 110 | resetFlag(flagZero) 111 | } 112 | resetFlag(flagNegative) 113 | if (result & 0x0F) == 0 { 114 | setFlag(flagHalf) 115 | } else { 116 | resetFlag(flagHalf) 117 | } 118 | } 119 | 120 | func opcodesINCHL() { 121 | address := hl.GetValue() 122 | result := mem.Read(address) 123 | result++ 124 | mem.Write(address, result) 125 | if isSetFlag(flagCarry) { 126 | initFlagReg(flagCarry) 127 | } else { 128 | clearAllFlags() 129 | } 130 | setZeroFlagFromResult(result) 131 | if (result & 0x0F) == 0x00 { 132 | setFlag(flagHalf) 133 | } 134 | } 135 | 136 | func opcodesDEC(reg *EightBitReg) { 137 | result := reg.GetValue() 138 | result-- 139 | reg.SetValue(result) 140 | if isSetFlag(flagCarry) { 141 | initFlagReg(flagCarry) 142 | } else { 143 | clearAllFlags() 144 | } 145 | setFlag(flagNegative) 146 | setZeroFlagFromResult(result) 147 | if (result & 0x0F) == 0x0F { 148 | setFlag(flagHalf) 149 | } 150 | } 151 | 152 | func opcodesDECHL() { 153 | address := hl.GetValue() 154 | result := mem.Read(address) 155 | result-- 156 | mem.Write(address, result) 157 | if isSetFlag(flagCarry) { 158 | initFlagReg(flagCarry) 159 | } else { 160 | clearAllFlags() 161 | } 162 | setFlag(flagNegative) 163 | setZeroFlagFromResult(result) 164 | if (result & 0x0F) == 0x0F { 165 | setFlag(flagHalf) 166 | } 167 | } 168 | 169 | func opcodesADD(number uint8) { 170 | result := uint(af.GetHigh()) + uint(number) 171 | carrybits := uint(af.GetHigh()) ^ uint(number) ^ result 172 | af.SetHigh(uint8(result)) 173 | clearAllFlags() 174 | setZeroFlagFromResult(uint8(result)) 175 | if (carrybits & 0x100) != 0 { 176 | setFlag(flagCarry) 177 | } 178 | if (carrybits & 0x10) != 0 { 179 | setFlag(flagHalf) 180 | } 181 | } 182 | 183 | func opcodesADC(number uint8) { 184 | var carry uint 185 | if isSetFlag(flagCarry) { 186 | carry = 1 187 | } else { 188 | carry = 0 189 | } 190 | result := uint(af.GetHigh()) + uint(number) + carry 191 | if uint8(result) == 0 { 192 | setFlag(flagZero) 193 | } else { 194 | resetFlag(flagZero) 195 | } 196 | resetFlag(flagNegative) 197 | if result > 0xFF { 198 | setFlag(flagCarry) 199 | } else { 200 | resetFlag(flagCarry) 201 | } 202 | if ((uint(af.GetHigh()) & 0x0F) + (uint(number) & 0x0F) + carry) > 0x0F { 203 | setFlag(flagHalf) 204 | } else { 205 | resetFlag(flagHalf) 206 | } 207 | af.SetHigh(uint8(result)) 208 | } 209 | 210 | func opcodesSUB(number uint8) { 211 | result := int(af.GetHigh()) - int(number) 212 | carrybits := int(af.GetHigh()) ^ int(number) ^ result 213 | af.SetHigh(uint8(result)) 214 | initFlagReg(flagNegative) 215 | setZeroFlagFromResult(uint8(result)) 216 | if (carrybits & 0x100) != 0 { 217 | setFlag(flagCarry) 218 | } 219 | if (carrybits & 0x10) != 0 { 220 | setFlag(flagHalf) 221 | } 222 | } 223 | 224 | func opcodesSBC(number uint8) { 225 | var carry int 226 | if isSetFlag(flagCarry) { 227 | carry = 1 228 | } else { 229 | carry = 0 230 | } 231 | result := int(af.GetHigh()) - int(number) - carry 232 | initFlagReg(flagNegative) 233 | setZeroFlagFromResult(uint8(result)) 234 | if result < 0 { 235 | setFlag(flagCarry) 236 | } 237 | if ((int(af.GetHigh()) & 0x0F) - (int(number) & 0x0F) - carry) < 0 { 238 | setFlag(flagHalf) 239 | } 240 | af.SetHigh(uint8(result)) 241 | } 242 | 243 | func opcodesADDHL(number uint16) { 244 | result := uint(hl.GetValue()) + uint(number) 245 | if isSetFlag(flagZero) { 246 | initFlagReg(flagZero) 247 | } else { 248 | clearAllFlags() 249 | } 250 | if (result & 0x10000) != 0 { 251 | setFlag(flagCarry) 252 | } 253 | if ((uint(hl.GetValue()) ^ uint(number) ^ (result & 0xFFFF)) & 0x1000) != 0 { 254 | setFlag(flagHalf) 255 | } 256 | hl.SetValue(uint16(result)) 257 | } 258 | 259 | func opcodesADDSP(number int8) { 260 | result := int(sp.GetValue()) + int(number) 261 | clearAllFlags() 262 | carrybits := int(sp.GetValue()) ^ int(number) ^ (result & 0xFFFF) 263 | if (carrybits & 0x100) == 0x100 { 264 | setFlag(flagCarry) 265 | } 266 | if (carrybits & 0x10) == 0x10 { 267 | setFlag(flagHalf) 268 | } 269 | sp.SetValue(uint16(result)) 270 | } 271 | 272 | func opcodesSWAPReg(reg *EightBitReg) { 273 | lowHalf := reg.GetValue() & 0x0F 274 | highHalf := (reg.GetValue() >> 4) & 0x0F 275 | reg.SetValue((lowHalf << 4) + highHalf) 276 | clearAllFlags() 277 | setZeroFlagFromResult(reg.GetValue()) 278 | } 279 | 280 | func opcodesSWAPHL() { 281 | address := hl.GetValue() 282 | result := mem.Read(address) 283 | lowHalf := result & 0x0F 284 | highHalf := (result >> 4) & 0x0F 285 | result = (lowHalf << 4) + highHalf 286 | mem.Write(address, result) 287 | clearAllFlags() 288 | setZeroFlagFromResult(result) 289 | } 290 | 291 | func opcodesSLA(reg *EightBitReg) { 292 | if (reg.GetValue() & 0x80) != 0 { 293 | initFlagReg(flagCarry) 294 | } else { 295 | clearAllFlags() 296 | } 297 | result := reg.GetValue() << 1 298 | reg.SetValue(result) 299 | setZeroFlagFromResult(result) 300 | } 301 | 302 | func opcodesSLAHL() { 303 | address := hl.GetValue() 304 | result := mem.Read(address) 305 | if (result & 0x80) != 0 { 306 | initFlagReg(flagCarry) 307 | } else { 308 | clearAllFlags() 309 | } 310 | result <<= 1 311 | mem.Write(address, result) 312 | setZeroFlagFromResult(result) 313 | } 314 | 315 | func opcodesSRA(reg *EightBitReg) { 316 | value := reg.GetValue() 317 | if (value & 0x01) != 0 { 318 | initFlagReg(flagCarry) 319 | } else { 320 | clearAllFlags() 321 | } 322 | result := value >> 1 323 | if (value & 0x80) != 0 { 324 | result |= 0x80 325 | } 326 | reg.SetValue(result) 327 | setZeroFlagFromResult(result) 328 | } 329 | 330 | func opcodesSRAHL() { 331 | address := hl.GetValue() 332 | value := mem.Read(address) 333 | if (value & 0x01) != 0 { 334 | initFlagReg(flagCarry) 335 | } else { 336 | clearAllFlags() 337 | } 338 | result := value >> 1 339 | if (value & 0x80) != 0 { 340 | result |= 0x80 341 | } 342 | mem.Write(address, result) 343 | setZeroFlagFromResult(result) 344 | } 345 | 346 | func opcodesSRL(reg *EightBitReg) { 347 | result := reg.GetValue() 348 | if (result & 0x01) != 0 { 349 | initFlagReg(flagCarry) 350 | } else { 351 | clearAllFlags() 352 | } 353 | result >>= 1 354 | reg.SetValue(result) 355 | setZeroFlagFromResult(result) 356 | } 357 | 358 | func opcodesSRLHL() { 359 | address := hl.GetValue() 360 | result := mem.Read(address) 361 | if (result & 0x01) != 0 { 362 | initFlagReg(flagCarry) 363 | } else { 364 | clearAllFlags() 365 | } 366 | result >>= 1 367 | mem.Write(address, result) 368 | setZeroFlagFromResult(result) 369 | } 370 | 371 | func opcodesRLC(reg *EightBitReg) { 372 | opcodesRLCA(reg) 373 | setZeroFlagFromResult(reg.GetValue()) 374 | } 375 | 376 | func opcodesRLCA(reg *EightBitReg) { 377 | value := reg.GetValue() 378 | result := value << 1 379 | if (value & 0x80) != 0 { 380 | initFlagReg(flagCarry) 381 | result |= 0x01 382 | } else { 383 | clearAllFlags() 384 | } 385 | reg.SetValue(result) 386 | } 387 | 388 | func opcodesRLCHL() { 389 | address := hl.GetValue() 390 | value := mem.Read(address) 391 | result := value << 1 392 | if (value & 0x80) != 0 { 393 | initFlagReg(flagCarry) 394 | result |= 0x01 395 | } else { 396 | clearAllFlags() 397 | } 398 | mem.Write(address, result) 399 | setZeroFlagFromResult(result) 400 | } 401 | 402 | func opcodesRL(reg *EightBitReg) { 403 | opcodesRLA(reg) 404 | setZeroFlagFromResult(reg.GetValue()) 405 | } 406 | 407 | func opcodesRLA(reg *EightBitReg) { 408 | var carry uint8 409 | if isSetFlag(flagCarry) { 410 | carry = 0x01 411 | } else { 412 | carry = 0x00 413 | } 414 | value := reg.GetValue() 415 | if (value & 0x80) != 0 { 416 | initFlagReg(flagCarry) 417 | } else { 418 | clearAllFlags() 419 | } 420 | result := (value << 1) | carry 421 | reg.SetValue(result) 422 | } 423 | 424 | func opcodesRLHL() { 425 | var carry uint8 426 | if isSetFlag(flagCarry) { 427 | carry = 0x01 428 | } else { 429 | carry = 0x00 430 | } 431 | address := hl.GetValue() 432 | value := mem.Read(address) 433 | if (value & 0x80) != 0 { 434 | initFlagReg(flagCarry) 435 | } else { 436 | clearAllFlags() 437 | } 438 | result := (value << 1) | carry 439 | mem.Write(address, result) 440 | setZeroFlagFromResult(result) 441 | } 442 | 443 | func opcodesRRC(reg *EightBitReg) { 444 | opcodesRRCA(reg) 445 | setZeroFlagFromResult(reg.GetValue()) 446 | } 447 | 448 | func opcodesRRCA(reg *EightBitReg) { 449 | value := reg.GetValue() 450 | result := value >> 1 451 | if (value & 0x01) != 0 { 452 | initFlagReg(flagCarry) 453 | result |= 0x80 454 | } else { 455 | clearAllFlags() 456 | } 457 | reg.SetValue(result) 458 | } 459 | 460 | func opcodesRRCHL() { 461 | address := hl.GetValue() 462 | value := mem.Read(address) 463 | result := value >> 1 464 | if (value & 0x01) != 0 { 465 | initFlagReg(flagCarry) 466 | result |= 0x80 467 | } else { 468 | clearAllFlags() 469 | } 470 | mem.Write(address, result) 471 | setZeroFlagFromResult(result) 472 | } 473 | 474 | func opcodesRR(reg *EightBitReg) { 475 | opcodesRRA(reg) 476 | setZeroFlagFromResult(reg.GetValue()) 477 | } 478 | 479 | func opcodesRRA(reg *EightBitReg) { 480 | var carry uint8 481 | if isSetFlag(flagCarry) { 482 | carry = 0x80 483 | } else { 484 | carry = 0x00 485 | } 486 | value := reg.GetValue() 487 | if (value & 0x01) != 0 { 488 | initFlagReg(flagCarry) 489 | } else { 490 | clearAllFlags() 491 | } 492 | result := (value >> 1) | carry 493 | reg.SetValue(result) 494 | } 495 | 496 | func opcodesRRHL() { 497 | var carry uint8 498 | if isSetFlag(flagCarry) { 499 | carry = 0x80 500 | } else { 501 | carry = 0x00 502 | } 503 | address := hl.GetValue() 504 | value := mem.Read(address) 505 | if (value & 0x01) != 0 { 506 | initFlagReg(flagCarry) 507 | } else { 508 | clearAllFlags() 509 | } 510 | result := (value >> 1) | carry 511 | mem.Write(address, result) 512 | setZeroFlagFromResult(result) 513 | } 514 | 515 | func opcodesBIT(reg *EightBitReg, bit uint) { 516 | if ((reg.GetValue() >> bit) & 0x01) == 0 { 517 | setFlag(flagZero) 518 | } else { 519 | resetFlag(flagZero) 520 | } 521 | setFlag(flagHalf) 522 | resetFlag(flagNegative) 523 | } 524 | 525 | func opcodesBITHL(bit uint) { 526 | if ((mem.Read(hl.GetValue()) >> bit) & 0x01) == 0 { 527 | setFlag(flagZero) 528 | } else { 529 | resetFlag(flagZero) 530 | } 531 | setFlag(flagHalf) 532 | resetFlag(flagNegative) 533 | } 534 | 535 | func opcodesSET(reg *EightBitReg, bit uint) { 536 | reg.SetValue(reg.GetValue() | (0x01 << bit)) 537 | } 538 | 539 | func opcodesSETHL(bit uint) { 540 | address := hl.GetValue() 541 | result := mem.Read(address) 542 | result |= (0x01 << bit) 543 | mem.Write(address, result) 544 | } 545 | 546 | func opcodesRES(reg *EightBitReg, bit uint) { 547 | reg.SetValue(reg.GetValue() &^ (0x01 << bit)) 548 | } 549 | 550 | func opcodesRESHL(bit uint) { 551 | address := hl.GetValue() 552 | result := mem.Read(address) 553 | result &= ^(0x01 << bit) 554 | mem.Write(address, result) 555 | } 556 | -------------------------------------------------------------------------------- /gb/cpu/cpu.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | import "github.com/drhelius/demo-emulator/gb/mapper" 4 | 5 | // Interrupt types 6 | const ( 7 | InterruptNone uint8 = 0x00 8 | InterruptVBlank uint8 = 0x01 9 | InterruptLCDSTAT uint8 = 0x02 10 | InterruptTimer uint8 = 0x04 11 | InterruptSerial uint8 = 0x08 12 | InterruptJoypad uint8 = 0x10 13 | ) 14 | 15 | // All the flags in the F register 16 | const ( 17 | flagZero uint8 = 0x80 18 | flagNegative uint8 = 0x40 19 | flagHalf uint8 = 0x20 20 | flagCarry uint8 = 0x10 21 | flagNone uint8 = 0x00 22 | ) 23 | 24 | var ( 25 | af SixteenBitReg 26 | bc SixteenBitReg 27 | de SixteenBitReg 28 | hl SixteenBitReg 29 | sp SixteenBitReg 30 | pc SixteenBitReg 31 | mem mapper.Mapper 32 | ime bool 33 | halted bool 34 | branchTaken bool 35 | clockCycles uint 36 | imeCycles int 37 | skipPCBug bool 38 | ) 39 | 40 | func init() { 41 | pc.SetValue(0x0100) 42 | sp.SetValue(0xFFFE) 43 | af.SetValue(0x01B0) 44 | bc.SetValue(0x0013) 45 | de.SetValue(0x00D8) 46 | hl.SetValue(0x014D) 47 | } 48 | 49 | // SetMapper injects the memory impl 50 | func SetMapper(m mapper.Mapper) { 51 | mem = m 52 | } 53 | 54 | // Tick runs a single instruction of the processor 55 | // Then returns the number of cycles used 56 | func Tick() uint { 57 | clockCycles = 0 58 | 59 | if halted { 60 | // if an interrupt is pending leave halt 61 | if interruptPending() != InterruptNone { 62 | halted = false 63 | } else { 64 | clockCycles += 4 65 | } 66 | } 67 | 68 | if !halted { 69 | // acknowledge any pending interrupt s 70 | serveInterrupt(interruptPending()) 71 | 72 | // fetch the next opcode and execute it 73 | runOpcode(fetchOpcode()) 74 | } 75 | 76 | updateTimers() 77 | updateSerial() 78 | 79 | // this is in order to delay the activation 80 | // of ima one instruction 81 | if imeCycles > 0 { 82 | imeCycles -= int(clockCycles) 83 | if imeCycles <= 0 { 84 | imeCycles = 0 85 | ime = true 86 | } 87 | } 88 | 89 | return clockCycles 90 | } 91 | 92 | // RequestInterrupt is used to raise a new interrupt 93 | func RequestInterrupt(interrupt uint8) { 94 | mem.Write(0xFF0F, mem.Read(0xFF0F)|interrupt) 95 | } 96 | 97 | func fetchOpcode() uint8 { 98 | opcode := mem.Read(pc.GetValue()) 99 | 100 | // if there is an interrupt pending and 101 | // the cpu is halted it fails to advance the PC register 102 | // once the cpu resumes operation 103 | // this bug is present in all the original DMGs 104 | if skipPCBug { 105 | skipPCBug = false 106 | } else { 107 | pc.Increment() 108 | } 109 | 110 | return opcode 111 | } 112 | 113 | func runOpcode(opcode uint8) { 114 | if opcode == 0xCB { 115 | opcode = fetchOpcode() 116 | opcodeCBArray[opcode]() 117 | clockCycles += machineCyclesCB[opcode] * 4 118 | } else { 119 | opcodeArray[opcode]() 120 | if branchTaken { 121 | branchTaken = false 122 | clockCycles += machineCyclesBranched[opcode] * 4 123 | } else { 124 | clockCycles += machineCycles[opcode] * 4 125 | } 126 | } 127 | } 128 | 129 | func interruptIsAboutToRaise() bool { 130 | ieReg := mem.Read(0xFFFF) 131 | ifReg := mem.Read(0xFF0F) 132 | return (ifReg & ieReg & 0x1F) != 0 133 | } 134 | 135 | func interruptPending() uint8 { 136 | ieReg := mem.Read(0xFFFF) 137 | ifReg := mem.Read(0xFF0F) 138 | ieIf := ieReg & ifReg 139 | 140 | switch { 141 | case (ieIf & 0x01) != 0: 142 | return InterruptVBlank 143 | case (ieIf & 0x02) != 0: 144 | return InterruptLCDSTAT 145 | case (ieIf & 0x04) != 0: 146 | return InterruptTimer 147 | case (ieIf & 0x08) != 0: 148 | return InterruptSerial 149 | case (ieIf & 0x10) != 0: 150 | return InterruptJoypad 151 | } 152 | 153 | return InterruptNone 154 | } 155 | 156 | func serveInterrupt(interrupt uint8) { 157 | if ime { 158 | ifReg := mem.Read(0xFF0F) 159 | switch interrupt { 160 | case InterruptVBlank: 161 | mem.Write(0xFF0F, ifReg&0xFE) 162 | ime = false 163 | stackPush(&pc) 164 | pc.SetValue(0x0040) 165 | clockCycles += 20 166 | case InterruptLCDSTAT: 167 | mem.Write(0xFF0F, ifReg&0xFD) 168 | ime = false 169 | stackPush(&pc) 170 | pc.SetValue(0x0048) 171 | clockCycles += 20 172 | case InterruptTimer: 173 | mem.Write(0xFF0F, ifReg&0xFB) 174 | ime = false 175 | stackPush(&pc) 176 | pc.SetValue(0x0050) 177 | clockCycles += 20 178 | case InterruptSerial: 179 | mem.Write(0xFF0F, ifReg&0xF7) 180 | ime = false 181 | stackPush(&pc) 182 | pc.SetValue(0x0058) 183 | clockCycles += 20 184 | case InterruptJoypad: 185 | mem.Write(0xFF0F, ifReg&0xEF) 186 | ime = false 187 | stackPush(&pc) 188 | pc.SetValue(0x0060) 189 | clockCycles += 20 190 | } 191 | } 192 | } 193 | -------------------------------------------------------------------------------- /gb/cpu/functors.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | type opcodeFunc func() 4 | type opcodeFuncArray [256]opcodeFunc 5 | 6 | var opcodeArray opcodeFuncArray 7 | var opcodeCBArray opcodeFuncArray 8 | 9 | func init() { 10 | 11 | // this two arrays store the poiters to 12 | // all the opcodes functions 13 | 14 | opcodeArray[0x00] = opcode0x00 15 | opcodeArray[0x01] = opcode0x01 16 | opcodeArray[0x02] = opcode0x02 17 | opcodeArray[0x03] = opcode0x03 18 | opcodeArray[0x04] = opcode0x04 19 | opcodeArray[0x05] = opcode0x05 20 | opcodeArray[0x06] = opcode0x06 21 | opcodeArray[0x07] = opcode0x07 22 | opcodeArray[0x08] = opcode0x08 23 | opcodeArray[0x09] = opcode0x09 24 | opcodeArray[0x0A] = opcode0x0A 25 | opcodeArray[0x0B] = opcode0x0B 26 | opcodeArray[0x0C] = opcode0x0C 27 | opcodeArray[0x0D] = opcode0x0D 28 | opcodeArray[0x0E] = opcode0x0E 29 | opcodeArray[0x0F] = opcode0x0F 30 | 31 | opcodeArray[0x10] = opcode0x10 32 | opcodeArray[0x11] = opcode0x11 33 | opcodeArray[0x12] = opcode0x12 34 | opcodeArray[0x13] = opcode0x13 35 | opcodeArray[0x14] = opcode0x14 36 | opcodeArray[0x15] = opcode0x15 37 | opcodeArray[0x16] = opcode0x16 38 | opcodeArray[0x17] = opcode0x17 39 | opcodeArray[0x18] = opcode0x18 40 | opcodeArray[0x19] = opcode0x19 41 | opcodeArray[0x1A] = opcode0x1A 42 | opcodeArray[0x1B] = opcode0x1B 43 | opcodeArray[0x1C] = opcode0x1C 44 | opcodeArray[0x1D] = opcode0x1D 45 | opcodeArray[0x1E] = opcode0x1E 46 | opcodeArray[0x1F] = opcode0x1F 47 | 48 | opcodeArray[0x20] = opcode0x20 49 | opcodeArray[0x21] = opcode0x21 50 | opcodeArray[0x22] = opcode0x22 51 | opcodeArray[0x23] = opcode0x23 52 | opcodeArray[0x24] = opcode0x24 53 | opcodeArray[0x25] = opcode0x25 54 | opcodeArray[0x26] = opcode0x26 55 | opcodeArray[0x27] = opcode0x27 56 | opcodeArray[0x28] = opcode0x28 57 | opcodeArray[0x29] = opcode0x29 58 | opcodeArray[0x2A] = opcode0x2A 59 | opcodeArray[0x2B] = opcode0x2B 60 | opcodeArray[0x2C] = opcode0x2C 61 | opcodeArray[0x2D] = opcode0x2D 62 | opcodeArray[0x2E] = opcode0x2E 63 | opcodeArray[0x2F] = opcode0x2F 64 | 65 | opcodeArray[0x30] = opcode0x30 66 | opcodeArray[0x31] = opcode0x31 67 | opcodeArray[0x32] = opcode0x32 68 | opcodeArray[0x33] = opcode0x33 69 | opcodeArray[0x34] = opcode0x34 70 | opcodeArray[0x35] = opcode0x35 71 | opcodeArray[0x36] = opcode0x36 72 | opcodeArray[0x37] = opcode0x37 73 | opcodeArray[0x38] = opcode0x38 74 | opcodeArray[0x39] = opcode0x39 75 | opcodeArray[0x3A] = opcode0x3A 76 | opcodeArray[0x3B] = opcode0x3B 77 | opcodeArray[0x3C] = opcode0x3C 78 | opcodeArray[0x3D] = opcode0x3D 79 | opcodeArray[0x3E] = opcode0x3E 80 | opcodeArray[0x3F] = opcode0x3F 81 | 82 | opcodeArray[0x40] = opcode0x40 83 | opcodeArray[0x41] = opcode0x41 84 | opcodeArray[0x42] = opcode0x42 85 | opcodeArray[0x43] = opcode0x43 86 | opcodeArray[0x44] = opcode0x44 87 | opcodeArray[0x45] = opcode0x45 88 | opcodeArray[0x46] = opcode0x46 89 | opcodeArray[0x47] = opcode0x47 90 | opcodeArray[0x48] = opcode0x48 91 | opcodeArray[0x49] = opcode0x49 92 | opcodeArray[0x4A] = opcode0x4A 93 | opcodeArray[0x4B] = opcode0x4B 94 | opcodeArray[0x4C] = opcode0x4C 95 | opcodeArray[0x4D] = opcode0x4D 96 | opcodeArray[0x4E] = opcode0x4E 97 | opcodeArray[0x4F] = opcode0x4F 98 | 99 | opcodeArray[0x50] = opcode0x50 100 | opcodeArray[0x51] = opcode0x51 101 | opcodeArray[0x52] = opcode0x52 102 | opcodeArray[0x53] = opcode0x53 103 | opcodeArray[0x54] = opcode0x54 104 | opcodeArray[0x55] = opcode0x55 105 | opcodeArray[0x56] = opcode0x56 106 | opcodeArray[0x57] = opcode0x57 107 | opcodeArray[0x58] = opcode0x58 108 | opcodeArray[0x59] = opcode0x59 109 | opcodeArray[0x5A] = opcode0x5A 110 | opcodeArray[0x5B] = opcode0x5B 111 | opcodeArray[0x5C] = opcode0x5C 112 | opcodeArray[0x5D] = opcode0x5D 113 | opcodeArray[0x5E] = opcode0x5E 114 | opcodeArray[0x5F] = opcode0x5F 115 | 116 | opcodeArray[0x60] = opcode0x60 117 | opcodeArray[0x61] = opcode0x61 118 | opcodeArray[0x62] = opcode0x62 119 | opcodeArray[0x63] = opcode0x63 120 | opcodeArray[0x64] = opcode0x64 121 | opcodeArray[0x65] = opcode0x65 122 | opcodeArray[0x66] = opcode0x66 123 | opcodeArray[0x67] = opcode0x67 124 | opcodeArray[0x68] = opcode0x68 125 | opcodeArray[0x69] = opcode0x69 126 | opcodeArray[0x6A] = opcode0x6A 127 | opcodeArray[0x6B] = opcode0x6B 128 | opcodeArray[0x6C] = opcode0x6C 129 | opcodeArray[0x6D] = opcode0x6D 130 | opcodeArray[0x6E] = opcode0x6E 131 | opcodeArray[0x6F] = opcode0x6F 132 | 133 | opcodeArray[0x70] = opcode0x70 134 | opcodeArray[0x71] = opcode0x71 135 | opcodeArray[0x72] = opcode0x72 136 | opcodeArray[0x73] = opcode0x73 137 | opcodeArray[0x74] = opcode0x74 138 | opcodeArray[0x75] = opcode0x75 139 | opcodeArray[0x76] = opcode0x76 140 | opcodeArray[0x77] = opcode0x77 141 | opcodeArray[0x78] = opcode0x78 142 | opcodeArray[0x79] = opcode0x79 143 | opcodeArray[0x7A] = opcode0x7A 144 | opcodeArray[0x7B] = opcode0x7B 145 | opcodeArray[0x7C] = opcode0x7C 146 | opcodeArray[0x7D] = opcode0x7D 147 | opcodeArray[0x7E] = opcode0x7E 148 | opcodeArray[0x7F] = opcode0x7F 149 | 150 | opcodeArray[0x80] = opcode0x80 151 | opcodeArray[0x81] = opcode0x81 152 | opcodeArray[0x82] = opcode0x82 153 | opcodeArray[0x83] = opcode0x83 154 | opcodeArray[0x84] = opcode0x84 155 | opcodeArray[0x85] = opcode0x85 156 | opcodeArray[0x86] = opcode0x86 157 | opcodeArray[0x87] = opcode0x87 158 | opcodeArray[0x88] = opcode0x88 159 | opcodeArray[0x89] = opcode0x89 160 | opcodeArray[0x8A] = opcode0x8A 161 | opcodeArray[0x8B] = opcode0x8B 162 | opcodeArray[0x8C] = opcode0x8C 163 | opcodeArray[0x8D] = opcode0x8D 164 | opcodeArray[0x8E] = opcode0x8E 165 | opcodeArray[0x8F] = opcode0x8F 166 | 167 | opcodeArray[0x90] = opcode0x90 168 | opcodeArray[0x91] = opcode0x91 169 | opcodeArray[0x92] = opcode0x92 170 | opcodeArray[0x93] = opcode0x93 171 | opcodeArray[0x94] = opcode0x94 172 | opcodeArray[0x95] = opcode0x95 173 | opcodeArray[0x96] = opcode0x96 174 | opcodeArray[0x97] = opcode0x97 175 | opcodeArray[0x98] = opcode0x98 176 | opcodeArray[0x99] = opcode0x99 177 | opcodeArray[0x9A] = opcode0x9A 178 | opcodeArray[0x9B] = opcode0x9B 179 | opcodeArray[0x9C] = opcode0x9C 180 | opcodeArray[0x9D] = opcode0x9D 181 | opcodeArray[0x9E] = opcode0x9E 182 | opcodeArray[0x9F] = opcode0x9F 183 | 184 | opcodeArray[0xA0] = opcode0xA0 185 | opcodeArray[0xA1] = opcode0xA1 186 | opcodeArray[0xA2] = opcode0xA2 187 | opcodeArray[0xA3] = opcode0xA3 188 | opcodeArray[0xA4] = opcode0xA4 189 | opcodeArray[0xA5] = opcode0xA5 190 | opcodeArray[0xA6] = opcode0xA6 191 | opcodeArray[0xA7] = opcode0xA7 192 | opcodeArray[0xA8] = opcode0xA8 193 | opcodeArray[0xA9] = opcode0xA9 194 | opcodeArray[0xAA] = opcode0xAA 195 | opcodeArray[0xAB] = opcode0xAB 196 | opcodeArray[0xAC] = opcode0xAC 197 | opcodeArray[0xAD] = opcode0xAD 198 | opcodeArray[0xAE] = opcode0xAE 199 | opcodeArray[0xAF] = opcode0xAF 200 | 201 | opcodeArray[0xB0] = opcode0xB0 202 | opcodeArray[0xB1] = opcode0xB1 203 | opcodeArray[0xB2] = opcode0xB2 204 | opcodeArray[0xB3] = opcode0xB3 205 | opcodeArray[0xB4] = opcode0xB4 206 | opcodeArray[0xB5] = opcode0xB5 207 | opcodeArray[0xB6] = opcode0xB6 208 | opcodeArray[0xB7] = opcode0xB7 209 | opcodeArray[0xB8] = opcode0xB8 210 | opcodeArray[0xB9] = opcode0xB9 211 | opcodeArray[0xBA] = opcode0xBA 212 | opcodeArray[0xBB] = opcode0xBB 213 | opcodeArray[0xBC] = opcode0xBC 214 | opcodeArray[0xBD] = opcode0xBD 215 | opcodeArray[0xBE] = opcode0xBE 216 | opcodeArray[0xBF] = opcode0xBF 217 | 218 | opcodeArray[0xC0] = opcode0xC0 219 | opcodeArray[0xC1] = opcode0xC1 220 | opcodeArray[0xC2] = opcode0xC2 221 | opcodeArray[0xC3] = opcode0xC3 222 | opcodeArray[0xC4] = opcode0xC4 223 | opcodeArray[0xC5] = opcode0xC5 224 | opcodeArray[0xC6] = opcode0xC6 225 | opcodeArray[0xC7] = opcode0xC7 226 | opcodeArray[0xC8] = opcode0xC8 227 | opcodeArray[0xC9] = opcode0xC9 228 | opcodeArray[0xCA] = opcode0xCA 229 | opcodeArray[0xCB] = opcode0xCB 230 | opcodeArray[0xCC] = opcode0xCC 231 | opcodeArray[0xCD] = opcode0xCD 232 | opcodeArray[0xCE] = opcode0xCE 233 | opcodeArray[0xCF] = opcode0xCF 234 | 235 | opcodeArray[0xD0] = opcode0xD0 236 | opcodeArray[0xD1] = opcode0xD1 237 | opcodeArray[0xD2] = opcode0xD2 238 | opcodeArray[0xD3] = opcode0xD3 239 | opcodeArray[0xD4] = opcode0xD4 240 | opcodeArray[0xD5] = opcode0xD5 241 | opcodeArray[0xD6] = opcode0xD6 242 | opcodeArray[0xD7] = opcode0xD7 243 | opcodeArray[0xD8] = opcode0xD8 244 | opcodeArray[0xD9] = opcode0xD9 245 | opcodeArray[0xDA] = opcode0xDA 246 | opcodeArray[0xDB] = opcode0xDB 247 | opcodeArray[0xDC] = opcode0xDC 248 | opcodeArray[0xDD] = opcode0xDD 249 | opcodeArray[0xDE] = opcode0xDE 250 | opcodeArray[0xDF] = opcode0xDF 251 | 252 | opcodeArray[0xE0] = opcode0xE0 253 | opcodeArray[0xE1] = opcode0xE1 254 | opcodeArray[0xE2] = opcode0xE2 255 | opcodeArray[0xE3] = opcode0xE3 256 | opcodeArray[0xE4] = opcode0xE4 257 | opcodeArray[0xE5] = opcode0xE5 258 | opcodeArray[0xE6] = opcode0xE6 259 | opcodeArray[0xE7] = opcode0xE7 260 | opcodeArray[0xE8] = opcode0xE8 261 | opcodeArray[0xE9] = opcode0xE9 262 | opcodeArray[0xEA] = opcode0xEA 263 | opcodeArray[0xEB] = opcode0xEB 264 | opcodeArray[0xEC] = opcode0xEC 265 | opcodeArray[0xED] = opcode0xED 266 | opcodeArray[0xEE] = opcode0xEE 267 | opcodeArray[0xEF] = opcode0xEF 268 | 269 | opcodeArray[0xF0] = opcode0xF0 270 | opcodeArray[0xF1] = opcode0xF1 271 | opcodeArray[0xF2] = opcode0xF2 272 | opcodeArray[0xF3] = opcode0xF3 273 | opcodeArray[0xF4] = opcode0xF4 274 | opcodeArray[0xF5] = opcode0xF5 275 | opcodeArray[0xF6] = opcode0xF6 276 | opcodeArray[0xF7] = opcode0xF7 277 | opcodeArray[0xF8] = opcode0xF8 278 | opcodeArray[0xF9] = opcode0xF9 279 | opcodeArray[0xFA] = opcode0xFA 280 | opcodeArray[0xFB] = opcode0xFB 281 | opcodeArray[0xFC] = opcode0xFC 282 | opcodeArray[0xFD] = opcode0xFD 283 | opcodeArray[0xFE] = opcode0xFE 284 | opcodeArray[0xFF] = opcode0xFF 285 | 286 | opcodeCBArray[0x00] = opcodeCB0x00 287 | opcodeCBArray[0x01] = opcodeCB0x01 288 | opcodeCBArray[0x02] = opcodeCB0x02 289 | opcodeCBArray[0x03] = opcodeCB0x03 290 | opcodeCBArray[0x04] = opcodeCB0x04 291 | opcodeCBArray[0x05] = opcodeCB0x05 292 | opcodeCBArray[0x06] = opcodeCB0x06 293 | opcodeCBArray[0x07] = opcodeCB0x07 294 | opcodeCBArray[0x08] = opcodeCB0x08 295 | opcodeCBArray[0x09] = opcodeCB0x09 296 | opcodeCBArray[0x0A] = opcodeCB0x0A 297 | opcodeCBArray[0x0B] = opcodeCB0x0B 298 | opcodeCBArray[0x0C] = opcodeCB0x0C 299 | opcodeCBArray[0x0D] = opcodeCB0x0D 300 | opcodeCBArray[0x0E] = opcodeCB0x0E 301 | opcodeCBArray[0x0F] = opcodeCB0x0F 302 | 303 | opcodeCBArray[0x10] = opcodeCB0x10 304 | opcodeCBArray[0x11] = opcodeCB0x11 305 | opcodeCBArray[0x12] = opcodeCB0x12 306 | opcodeCBArray[0x13] = opcodeCB0x13 307 | opcodeCBArray[0x14] = opcodeCB0x14 308 | opcodeCBArray[0x15] = opcodeCB0x15 309 | opcodeCBArray[0x16] = opcodeCB0x16 310 | opcodeCBArray[0x17] = opcodeCB0x17 311 | opcodeCBArray[0x18] = opcodeCB0x18 312 | opcodeCBArray[0x19] = opcodeCB0x19 313 | opcodeCBArray[0x1A] = opcodeCB0x1A 314 | opcodeCBArray[0x1B] = opcodeCB0x1B 315 | opcodeCBArray[0x1C] = opcodeCB0x1C 316 | opcodeCBArray[0x1D] = opcodeCB0x1D 317 | opcodeCBArray[0x1E] = opcodeCB0x1E 318 | opcodeCBArray[0x1F] = opcodeCB0x1F 319 | 320 | opcodeCBArray[0x20] = opcodeCB0x20 321 | opcodeCBArray[0x21] = opcodeCB0x21 322 | opcodeCBArray[0x22] = opcodeCB0x22 323 | opcodeCBArray[0x23] = opcodeCB0x23 324 | opcodeCBArray[0x24] = opcodeCB0x24 325 | opcodeCBArray[0x25] = opcodeCB0x25 326 | opcodeCBArray[0x26] = opcodeCB0x26 327 | opcodeCBArray[0x27] = opcodeCB0x27 328 | opcodeCBArray[0x28] = opcodeCB0x28 329 | opcodeCBArray[0x29] = opcodeCB0x29 330 | opcodeCBArray[0x2A] = opcodeCB0x2A 331 | opcodeCBArray[0x2B] = opcodeCB0x2B 332 | opcodeCBArray[0x2C] = opcodeCB0x2C 333 | opcodeCBArray[0x2D] = opcodeCB0x2D 334 | opcodeCBArray[0x2E] = opcodeCB0x2E 335 | opcodeCBArray[0x2F] = opcodeCB0x2F 336 | 337 | opcodeCBArray[0x30] = opcodeCB0x30 338 | opcodeCBArray[0x31] = opcodeCB0x31 339 | opcodeCBArray[0x32] = opcodeCB0x32 340 | opcodeCBArray[0x33] = opcodeCB0x33 341 | opcodeCBArray[0x34] = opcodeCB0x34 342 | opcodeCBArray[0x35] = opcodeCB0x35 343 | opcodeCBArray[0x36] = opcodeCB0x36 344 | opcodeCBArray[0x37] = opcodeCB0x37 345 | opcodeCBArray[0x38] = opcodeCB0x38 346 | opcodeCBArray[0x39] = opcodeCB0x39 347 | opcodeCBArray[0x3A] = opcodeCB0x3A 348 | opcodeCBArray[0x3B] = opcodeCB0x3B 349 | opcodeCBArray[0x3C] = opcodeCB0x3C 350 | opcodeCBArray[0x3D] = opcodeCB0x3D 351 | opcodeCBArray[0x3E] = opcodeCB0x3E 352 | opcodeCBArray[0x3F] = opcodeCB0x3F 353 | 354 | opcodeCBArray[0x40] = opcodeCB0x40 355 | opcodeCBArray[0x41] = opcodeCB0x41 356 | opcodeCBArray[0x42] = opcodeCB0x42 357 | opcodeCBArray[0x43] = opcodeCB0x43 358 | opcodeCBArray[0x44] = opcodeCB0x44 359 | opcodeCBArray[0x45] = opcodeCB0x45 360 | opcodeCBArray[0x46] = opcodeCB0x46 361 | opcodeCBArray[0x47] = opcodeCB0x47 362 | opcodeCBArray[0x48] = opcodeCB0x48 363 | opcodeCBArray[0x49] = opcodeCB0x49 364 | opcodeCBArray[0x4A] = opcodeCB0x4A 365 | opcodeCBArray[0x4B] = opcodeCB0x4B 366 | opcodeCBArray[0x4C] = opcodeCB0x4C 367 | opcodeCBArray[0x4D] = opcodeCB0x4D 368 | opcodeCBArray[0x4E] = opcodeCB0x4E 369 | opcodeCBArray[0x4F] = opcodeCB0x4F 370 | 371 | opcodeCBArray[0x50] = opcodeCB0x50 372 | opcodeCBArray[0x51] = opcodeCB0x51 373 | opcodeCBArray[0x52] = opcodeCB0x52 374 | opcodeCBArray[0x53] = opcodeCB0x53 375 | opcodeCBArray[0x54] = opcodeCB0x54 376 | opcodeCBArray[0x55] = opcodeCB0x55 377 | opcodeCBArray[0x56] = opcodeCB0x56 378 | opcodeCBArray[0x57] = opcodeCB0x57 379 | opcodeCBArray[0x58] = opcodeCB0x58 380 | opcodeCBArray[0x59] = opcodeCB0x59 381 | opcodeCBArray[0x5A] = opcodeCB0x5A 382 | opcodeCBArray[0x5B] = opcodeCB0x5B 383 | opcodeCBArray[0x5C] = opcodeCB0x5C 384 | opcodeCBArray[0x5D] = opcodeCB0x5D 385 | opcodeCBArray[0x5E] = opcodeCB0x5E 386 | opcodeCBArray[0x5F] = opcodeCB0x5F 387 | 388 | opcodeCBArray[0x60] = opcodeCB0x60 389 | opcodeCBArray[0x61] = opcodeCB0x61 390 | opcodeCBArray[0x62] = opcodeCB0x62 391 | opcodeCBArray[0x63] = opcodeCB0x63 392 | opcodeCBArray[0x64] = opcodeCB0x64 393 | opcodeCBArray[0x65] = opcodeCB0x65 394 | opcodeCBArray[0x66] = opcodeCB0x66 395 | opcodeCBArray[0x67] = opcodeCB0x67 396 | opcodeCBArray[0x68] = opcodeCB0x68 397 | opcodeCBArray[0x69] = opcodeCB0x69 398 | opcodeCBArray[0x6A] = opcodeCB0x6A 399 | opcodeCBArray[0x6B] = opcodeCB0x6B 400 | opcodeCBArray[0x6C] = opcodeCB0x6C 401 | opcodeCBArray[0x6D] = opcodeCB0x6D 402 | opcodeCBArray[0x6E] = opcodeCB0x6E 403 | opcodeCBArray[0x6F] = opcodeCB0x6F 404 | 405 | opcodeCBArray[0x70] = opcodeCB0x70 406 | opcodeCBArray[0x71] = opcodeCB0x71 407 | opcodeCBArray[0x72] = opcodeCB0x72 408 | opcodeCBArray[0x73] = opcodeCB0x73 409 | opcodeCBArray[0x74] = opcodeCB0x74 410 | opcodeCBArray[0x75] = opcodeCB0x75 411 | opcodeCBArray[0x76] = opcodeCB0x76 412 | opcodeCBArray[0x77] = opcodeCB0x77 413 | opcodeCBArray[0x78] = opcodeCB0x78 414 | opcodeCBArray[0x79] = opcodeCB0x79 415 | opcodeCBArray[0x7A] = opcodeCB0x7A 416 | opcodeCBArray[0x7B] = opcodeCB0x7B 417 | opcodeCBArray[0x7C] = opcodeCB0x7C 418 | opcodeCBArray[0x7D] = opcodeCB0x7D 419 | opcodeCBArray[0x7E] = opcodeCB0x7E 420 | opcodeCBArray[0x7F] = opcodeCB0x7F 421 | 422 | opcodeCBArray[0x80] = opcodeCB0x80 423 | opcodeCBArray[0x81] = opcodeCB0x81 424 | opcodeCBArray[0x82] = opcodeCB0x82 425 | opcodeCBArray[0x83] = opcodeCB0x83 426 | opcodeCBArray[0x84] = opcodeCB0x84 427 | opcodeCBArray[0x85] = opcodeCB0x85 428 | opcodeCBArray[0x86] = opcodeCB0x86 429 | opcodeCBArray[0x87] = opcodeCB0x87 430 | opcodeCBArray[0x88] = opcodeCB0x88 431 | opcodeCBArray[0x89] = opcodeCB0x89 432 | opcodeCBArray[0x8A] = opcodeCB0x8A 433 | opcodeCBArray[0x8B] = opcodeCB0x8B 434 | opcodeCBArray[0x8C] = opcodeCB0x8C 435 | opcodeCBArray[0x8D] = opcodeCB0x8D 436 | opcodeCBArray[0x8E] = opcodeCB0x8E 437 | opcodeCBArray[0x8F] = opcodeCB0x8F 438 | 439 | opcodeCBArray[0x90] = opcodeCB0x90 440 | opcodeCBArray[0x91] = opcodeCB0x91 441 | opcodeCBArray[0x92] = opcodeCB0x92 442 | opcodeCBArray[0x93] = opcodeCB0x93 443 | opcodeCBArray[0x94] = opcodeCB0x94 444 | opcodeCBArray[0x95] = opcodeCB0x95 445 | opcodeCBArray[0x96] = opcodeCB0x96 446 | opcodeCBArray[0x97] = opcodeCB0x97 447 | opcodeCBArray[0x98] = opcodeCB0x98 448 | opcodeCBArray[0x99] = opcodeCB0x99 449 | opcodeCBArray[0x9A] = opcodeCB0x9A 450 | opcodeCBArray[0x9B] = opcodeCB0x9B 451 | opcodeCBArray[0x9C] = opcodeCB0x9C 452 | opcodeCBArray[0x9D] = opcodeCB0x9D 453 | opcodeCBArray[0x9E] = opcodeCB0x9E 454 | opcodeCBArray[0x9F] = opcodeCB0x9F 455 | 456 | opcodeCBArray[0xA0] = opcodeCB0xA0 457 | opcodeCBArray[0xA1] = opcodeCB0xA1 458 | opcodeCBArray[0xA2] = opcodeCB0xA2 459 | opcodeCBArray[0xA3] = opcodeCB0xA3 460 | opcodeCBArray[0xA4] = opcodeCB0xA4 461 | opcodeCBArray[0xA5] = opcodeCB0xA5 462 | opcodeCBArray[0xA6] = opcodeCB0xA6 463 | opcodeCBArray[0xA7] = opcodeCB0xA7 464 | opcodeCBArray[0xA8] = opcodeCB0xA8 465 | opcodeCBArray[0xA9] = opcodeCB0xA9 466 | opcodeCBArray[0xAA] = opcodeCB0xAA 467 | opcodeCBArray[0xAB] = opcodeCB0xAB 468 | opcodeCBArray[0xAC] = opcodeCB0xAC 469 | opcodeCBArray[0xAD] = opcodeCB0xAD 470 | opcodeCBArray[0xAE] = opcodeCB0xAE 471 | opcodeCBArray[0xAF] = opcodeCB0xAF 472 | 473 | opcodeCBArray[0xB0] = opcodeCB0xB0 474 | opcodeCBArray[0xB1] = opcodeCB0xB1 475 | opcodeCBArray[0xB2] = opcodeCB0xB2 476 | opcodeCBArray[0xB3] = opcodeCB0xB3 477 | opcodeCBArray[0xB4] = opcodeCB0xB4 478 | opcodeCBArray[0xB5] = opcodeCB0xB5 479 | opcodeCBArray[0xB6] = opcodeCB0xB6 480 | opcodeCBArray[0xB7] = opcodeCB0xB7 481 | opcodeCBArray[0xB8] = opcodeCB0xB8 482 | opcodeCBArray[0xB9] = opcodeCB0xB9 483 | opcodeCBArray[0xBA] = opcodeCB0xBA 484 | opcodeCBArray[0xBB] = opcodeCB0xBB 485 | opcodeCBArray[0xBC] = opcodeCB0xBC 486 | opcodeCBArray[0xBD] = opcodeCB0xBD 487 | opcodeCBArray[0xBE] = opcodeCB0xBE 488 | opcodeCBArray[0xBF] = opcodeCB0xBF 489 | 490 | opcodeCBArray[0xC0] = opcodeCB0xC0 491 | opcodeCBArray[0xC1] = opcodeCB0xC1 492 | opcodeCBArray[0xC2] = opcodeCB0xC2 493 | opcodeCBArray[0xC3] = opcodeCB0xC3 494 | opcodeCBArray[0xC4] = opcodeCB0xC4 495 | opcodeCBArray[0xC5] = opcodeCB0xC5 496 | opcodeCBArray[0xC6] = opcodeCB0xC6 497 | opcodeCBArray[0xC7] = opcodeCB0xC7 498 | opcodeCBArray[0xC8] = opcodeCB0xC8 499 | opcodeCBArray[0xC9] = opcodeCB0xC9 500 | opcodeCBArray[0xCA] = opcodeCB0xCA 501 | opcodeCBArray[0xCB] = opcodeCB0xCB 502 | opcodeCBArray[0xCC] = opcodeCB0xCC 503 | opcodeCBArray[0xCD] = opcodeCB0xCD 504 | opcodeCBArray[0xCE] = opcodeCB0xCE 505 | opcodeCBArray[0xCF] = opcodeCB0xCF 506 | 507 | opcodeCBArray[0xD0] = opcodeCB0xD0 508 | opcodeCBArray[0xD1] = opcodeCB0xD1 509 | opcodeCBArray[0xD2] = opcodeCB0xD2 510 | opcodeCBArray[0xD3] = opcodeCB0xD3 511 | opcodeCBArray[0xD4] = opcodeCB0xD4 512 | opcodeCBArray[0xD5] = opcodeCB0xD5 513 | opcodeCBArray[0xD6] = opcodeCB0xD6 514 | opcodeCBArray[0xD7] = opcodeCB0xD7 515 | opcodeCBArray[0xD8] = opcodeCB0xD8 516 | opcodeCBArray[0xD9] = opcodeCB0xD9 517 | opcodeCBArray[0xDA] = opcodeCB0xDA 518 | opcodeCBArray[0xDB] = opcodeCB0xDB 519 | opcodeCBArray[0xDC] = opcodeCB0xDC 520 | opcodeCBArray[0xDD] = opcodeCB0xDD 521 | opcodeCBArray[0xDE] = opcodeCB0xDE 522 | opcodeCBArray[0xDF] = opcodeCB0xDF 523 | 524 | opcodeCBArray[0xE0] = opcodeCB0xE0 525 | opcodeCBArray[0xE1] = opcodeCB0xE1 526 | opcodeCBArray[0xE2] = opcodeCB0xE2 527 | opcodeCBArray[0xE3] = opcodeCB0xE3 528 | opcodeCBArray[0xE4] = opcodeCB0xE4 529 | opcodeCBArray[0xE5] = opcodeCB0xE5 530 | opcodeCBArray[0xE6] = opcodeCB0xE6 531 | opcodeCBArray[0xE7] = opcodeCB0xE7 532 | opcodeCBArray[0xE8] = opcodeCB0xE8 533 | opcodeCBArray[0xE9] = opcodeCB0xE9 534 | opcodeCBArray[0xEA] = opcodeCB0xEA 535 | opcodeCBArray[0xEB] = opcodeCB0xEB 536 | opcodeCBArray[0xEC] = opcodeCB0xEC 537 | opcodeCBArray[0xED] = opcodeCB0xED 538 | opcodeCBArray[0xEE] = opcodeCB0xEE 539 | opcodeCBArray[0xEF] = opcodeCB0xEF 540 | 541 | opcodeCBArray[0xF0] = opcodeCB0xF0 542 | opcodeCBArray[0xF1] = opcodeCB0xF1 543 | opcodeCBArray[0xF2] = opcodeCB0xF2 544 | opcodeCBArray[0xF3] = opcodeCB0xF3 545 | opcodeCBArray[0xF4] = opcodeCB0xF4 546 | opcodeCBArray[0xF5] = opcodeCB0xF5 547 | opcodeCBArray[0xF6] = opcodeCB0xF6 548 | opcodeCBArray[0xF7] = opcodeCB0xF7 549 | opcodeCBArray[0xF8] = opcodeCB0xF8 550 | opcodeCBArray[0xF9] = opcodeCB0xF9 551 | opcodeCBArray[0xFA] = opcodeCB0xFA 552 | opcodeCBArray[0xFB] = opcodeCB0xFB 553 | opcodeCBArray[0xFC] = opcodeCB0xFC 554 | opcodeCBArray[0xFD] = opcodeCB0xFD 555 | opcodeCBArray[0xFE] = opcodeCB0xFE 556 | opcodeCBArray[0xFF] = opcodeCB0xFF 557 | } 558 | -------------------------------------------------------------------------------- /gb/cpu/normal_opcodes.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | func opcode0x00() { 4 | // NOP 5 | } 6 | 7 | func opcode0x01() { 8 | // LD BC,nn 9 | opcodesLDAddrToReg(bc.GetLowReg(), pc.GetValue()) 10 | pc.Increment() 11 | opcodesLDAddrToReg(bc.GetHighReg(), pc.GetValue()) 12 | pc.Increment() 13 | } 14 | 15 | func opcode0x02() { 16 | // LD (BC),A 17 | opcodesLDValueToAddr(bc.GetValue(), af.GetHigh()) 18 | } 19 | 20 | func opcode0x03() { 21 | // INC BC 22 | bc.Increment() 23 | } 24 | 25 | func opcode0x04() { 26 | // INC B 27 | opcodesINC(bc.GetHighReg()) 28 | } 29 | 30 | func opcode0x05() { 31 | // DEC B 32 | opcodesDEC(bc.GetHighReg()) 33 | } 34 | 35 | func opcode0x06() { 36 | // LD B,n 37 | opcodesLDAddrToReg(bc.GetHighReg(), pc.GetValue()) 38 | pc.Increment() 39 | } 40 | 41 | func opcode0x07() { 42 | // RLCA 43 | opcodesRLCA(af.GetHighReg()) 44 | } 45 | 46 | func opcode0x08() { 47 | // LD (nn),SP 48 | l := uint16(mem.Read(pc.GetValue())) 49 | pc.Increment() 50 | h := uint16(mem.Read(pc.GetValue())) 51 | pc.Increment() 52 | address := ((h << 8) + l) 53 | mem.Write(address, sp.GetLow()) 54 | mem.Write(address+1, sp.GetHigh()) 55 | } 56 | 57 | func opcode0x09() { 58 | // ADD HL,BC 59 | opcodesADDHL(bc.GetValue()) 60 | } 61 | 62 | func opcode0x0A() { 63 | // LD A,(BC) 64 | opcodesLDAddrToReg(af.GetHighReg(), bc.GetValue()) 65 | } 66 | 67 | func opcode0x0B() { 68 | // DEC BC 69 | bc.Decrement() 70 | } 71 | 72 | func opcode0x0C() { 73 | // INC C 74 | opcodesINC(bc.GetLowReg()) 75 | } 76 | 77 | func opcode0x0D() { 78 | // DEC C 79 | opcodesDEC(bc.GetLowReg()) 80 | } 81 | 82 | func opcode0x0E() { 83 | // LD C,n 84 | opcodesLDAddrToReg(bc.GetLowReg(), pc.GetValue()) 85 | pc.Increment() 86 | } 87 | 88 | func opcode0x0F() { 89 | // RRCA 90 | opcodesRRCA(af.GetHighReg()) 91 | } 92 | 93 | func opcode0x10() { 94 | // STOP 95 | pc.Increment() 96 | } 97 | 98 | func opcode0x11() { 99 | // LD DE,nn 100 | opcodesLDAddrToReg(de.GetLowReg(), pc.GetValue()) 101 | pc.Increment() 102 | opcodesLDAddrToReg(de.GetHighReg(), pc.GetValue()) 103 | pc.Increment() 104 | } 105 | 106 | func opcode0x12() { 107 | // LD (DE),A 108 | opcodesLDValueToAddr(de.GetValue(), af.GetHigh()) 109 | } 110 | 111 | func opcode0x13() { 112 | // INC DE 113 | de.Increment() 114 | } 115 | 116 | func opcode0x14() { 117 | // INC D 118 | opcodesINC(de.GetHighReg()) 119 | } 120 | 121 | func opcode0x15() { 122 | // DEC D 123 | opcodesDEC(de.GetHighReg()) 124 | } 125 | 126 | func opcode0x16() { 127 | // LD D,n 128 | opcodesLDAddrToReg(de.GetHighReg(), pc.GetValue()) 129 | pc.Increment() 130 | } 131 | 132 | func opcode0x17() { 133 | // RLA 134 | opcodesRLA(af.GetHighReg()) 135 | } 136 | 137 | func opcode0x18() { 138 | // JR n 139 | offset := int8(mem.Read(pc.GetValue())) 140 | value := int(pc.GetValue()) + 1 + int(offset) 141 | pc.SetValue(uint16(value)) 142 | } 143 | 144 | func opcode0x19() { 145 | // ADD HL,DE 146 | opcodesADDHL(de.GetValue()) 147 | } 148 | 149 | func opcode0x1A() { 150 | // LD A,(DE) 151 | opcodesLDAddrToReg(af.GetHighReg(), de.GetValue()) 152 | } 153 | 154 | func opcode0x1B() { 155 | // DEC DE 156 | de.Decrement() 157 | } 158 | 159 | func opcode0x1C() { 160 | // INC E 161 | opcodesINC(de.GetLowReg()) 162 | } 163 | 164 | func opcode0x1D() { 165 | // DEC E 166 | opcodesDEC(de.GetLowReg()) 167 | } 168 | 169 | func opcode0x1E() { 170 | // LD E,n 171 | opcodesLDAddrToReg(de.GetLowReg(), pc.GetValue()) 172 | pc.Increment() 173 | } 174 | 175 | func opcode0x1F() { 176 | // RRA 177 | opcodesRRA(af.GetHighReg()) 178 | } 179 | 180 | func opcode0x20() { 181 | // JR NZ,n 182 | if !isSetFlag(flagZero) { 183 | offset := int8(mem.Read(pc.GetValue())) 184 | value := int(pc.GetValue()) + 1 + int(offset) 185 | pc.SetValue(uint16(value)) 186 | branchTaken = true 187 | } else { 188 | pc.Increment() 189 | } 190 | } 191 | 192 | func opcode0x21() { 193 | // LD HL,nn 194 | opcodesLDAddrToReg(hl.GetLowReg(), pc.GetValue()) 195 | pc.Increment() 196 | opcodesLDAddrToReg(hl.GetHighReg(), pc.GetValue()) 197 | pc.Increment() 198 | } 199 | 200 | func opcode0x22() { 201 | // LD (HLI),A 202 | opcodesLDValueToAddr(hl.GetValue(), af.GetHigh()) 203 | hl.Increment() 204 | } 205 | 206 | func opcode0x23() { 207 | // INC HL 208 | hl.Increment() 209 | } 210 | 211 | func opcode0x24() { 212 | // INC H 213 | opcodesINC(hl.GetHighReg()) 214 | } 215 | 216 | func opcode0x25() { 217 | // DEC H 218 | opcodesDEC(hl.GetHighReg()) 219 | } 220 | 221 | func opcode0x26() { 222 | // LD H,n 223 | opcodesLDAddrToReg(hl.GetHighReg(), pc.GetValue()) 224 | pc.Increment() 225 | } 226 | 227 | func opcode0x27() { 228 | // DAA 229 | a := uint16(af.GetHigh()) 230 | 231 | if !isSetFlag(flagNegative) { 232 | if isSetFlag(flagHalf) || ((a & 0xF) > 9) { 233 | a += 0x06 234 | } 235 | if isSetFlag(flagCarry) || (a > 0x9F) { 236 | a += 0x60 237 | } 238 | } else { 239 | if isSetFlag(flagHalf) { 240 | a = (a - 6) & 0xFF 241 | } 242 | if isSetFlag(flagCarry) { 243 | a -= 0x60 244 | } 245 | } 246 | 247 | resetFlag(flagHalf) 248 | resetFlag(flagZero) 249 | 250 | if (a & 0x100) == 0x100 { 251 | setFlag(flagCarry) 252 | } 253 | 254 | a &= 0xFF 255 | 256 | setZeroFlagFromResult(uint8(a)) 257 | 258 | af.SetHigh(uint8(a)) 259 | } 260 | 261 | func opcode0x28() { 262 | // JR Z,n 263 | if isSetFlag(flagZero) { 264 | offset := int8(mem.Read(pc.GetValue())) 265 | value := int(pc.GetValue()) + 1 + int(offset) 266 | pc.SetValue(uint16(value)) 267 | branchTaken = true 268 | } else { 269 | pc.Increment() 270 | } 271 | } 272 | 273 | func opcode0x29() { 274 | // ADD HL,HL 275 | opcodesADDHL(hl.GetValue()) 276 | } 277 | 278 | func opcode0x2A() { 279 | // LD A,(HLI) 280 | opcodesLDAddrToReg(af.GetHighReg(), hl.GetValue()) 281 | hl.Increment() 282 | } 283 | 284 | func opcode0x2B() { 285 | // DEC HL 286 | hl.Decrement() 287 | } 288 | 289 | func opcode0x2C() { 290 | // INC L 291 | opcodesINC(hl.GetLowReg()) 292 | } 293 | 294 | func opcode0x2D() { 295 | // DEC L 296 | opcodesDEC(hl.GetLowReg()) 297 | } 298 | 299 | func opcode0x2E() { 300 | // LD L,n 301 | opcodesLDAddrToReg(hl.GetLowReg(), pc.GetValue()) 302 | pc.Increment() 303 | } 304 | 305 | func opcode0x2F() { 306 | // CPL 307 | af.SetHigh(^af.GetHigh()) 308 | setFlag(flagHalf) 309 | setFlag(flagNegative) 310 | } 311 | 312 | func opcode0x30() { 313 | // JR NC,n 314 | if !isSetFlag(flagCarry) { 315 | offset := int8(mem.Read(pc.GetValue())) 316 | value := int(pc.GetValue()) + 1 + int(offset) 317 | pc.SetValue(uint16(value)) 318 | branchTaken = true 319 | } else { 320 | pc.Increment() 321 | } 322 | } 323 | 324 | func opcode0x31() { 325 | // LD SP,nn 326 | sp.SetLow(mem.Read(pc.GetValue())) 327 | pc.Increment() 328 | sp.SetHigh(mem.Read(pc.GetValue())) 329 | pc.Increment() 330 | } 331 | 332 | func opcode0x32() { 333 | // LD (HLD), A 334 | opcodesLDValueToAddr(hl.GetValue(), af.GetHigh()) 335 | hl.Decrement() 336 | } 337 | 338 | func opcode0x33() { 339 | // INC SP 340 | sp.Increment() 341 | } 342 | 343 | func opcode0x34() { 344 | // INC (HL) 345 | opcodesINCHL() 346 | } 347 | 348 | func opcode0x35() { 349 | // DEC (HL) 350 | opcodesDECHL() 351 | } 352 | 353 | func opcode0x36() { 354 | // LD (HL),n 355 | mem.Write(hl.GetValue(), mem.Read(pc.GetValue())) 356 | pc.Increment() 357 | } 358 | 359 | func opcode0x37() { 360 | // SCF 361 | setFlag(flagCarry) 362 | resetFlag(flagHalf) 363 | resetFlag(flagNegative) 364 | } 365 | 366 | func opcode0x38() { 367 | // JR C,n 368 | if isSetFlag(flagCarry) { 369 | offset := int8(mem.Read(pc.GetValue())) 370 | value := int(pc.GetValue()) + 1 + int(offset) 371 | pc.SetValue(uint16(value)) 372 | branchTaken = true 373 | } else { 374 | pc.Increment() 375 | } 376 | } 377 | 378 | func opcode0x39() { 379 | // ADD HL,SP 380 | opcodesADDHL(sp.GetValue()) 381 | } 382 | 383 | func opcode0x3A() { 384 | // LD A,(HLD) 385 | opcodesLDAddrToReg(af.GetHighReg(), hl.GetValue()) 386 | hl.Decrement() 387 | } 388 | 389 | func opcode0x3B() { 390 | // DEC SP 391 | sp.Decrement() 392 | } 393 | 394 | func opcode0x3C() { 395 | // INC A 396 | opcodesINC(af.GetHighReg()) 397 | } 398 | 399 | func opcode0x3D() { 400 | // DEC A 401 | opcodesDEC(af.GetHighReg()) 402 | 403 | } 404 | 405 | func opcode0x3E() { 406 | // LD A,n 407 | opcodesLDAddrToReg(af.GetHighReg(), pc.GetValue()) 408 | pc.Increment() 409 | } 410 | 411 | func opcode0x3F() { 412 | // CCF 413 | flipFlag(flagCarry) 414 | resetFlag(flagHalf) 415 | resetFlag(flagNegative) 416 | } 417 | 418 | func opcode0x40() { 419 | // LD B,B 420 | opcodesLDValueToReg(bc.GetHighReg(), bc.GetHigh()) 421 | } 422 | 423 | func opcode0x41() { 424 | // LD B,C 425 | opcodesLDValueToReg(bc.GetHighReg(), bc.GetLow()) 426 | } 427 | 428 | func opcode0x42() { 429 | // LD B,D 430 | opcodesLDValueToReg(bc.GetHighReg(), de.GetHigh()) 431 | } 432 | 433 | func opcode0x43() { 434 | // LD B,E 435 | opcodesLDValueToReg(bc.GetHighReg(), de.GetLow()) 436 | } 437 | 438 | func opcode0x44() { 439 | // LD B,H 440 | opcodesLDValueToReg(bc.GetHighReg(), hl.GetHigh()) 441 | } 442 | 443 | func opcode0x45() { 444 | // LD B,L 445 | opcodesLDValueToReg(bc.GetHighReg(), hl.GetLow()) 446 | } 447 | 448 | func opcode0x46() { 449 | // LD B,(HL) 450 | opcodesLDAddrToReg(bc.GetHighReg(), hl.GetValue()) 451 | } 452 | 453 | func opcode0x47() { 454 | // LD B,A 455 | opcodesLDValueToReg(bc.GetHighReg(), af.GetHigh()) 456 | } 457 | 458 | func opcode0x48() { 459 | // LD C,B 460 | opcodesLDValueToReg(bc.GetLowReg(), bc.GetHigh()) 461 | } 462 | 463 | func opcode0x49() { 464 | // LD C,C 465 | opcodesLDValueToReg(bc.GetLowReg(), bc.GetLow()) 466 | } 467 | 468 | func opcode0x4A() { 469 | // LD C,D 470 | opcodesLDValueToReg(bc.GetLowReg(), de.GetHigh()) 471 | } 472 | 473 | func opcode0x4B() { 474 | // LD C,E 475 | opcodesLDValueToReg(bc.GetLowReg(), de.GetLow()) 476 | } 477 | 478 | func opcode0x4C() { 479 | // LD C,H 480 | opcodesLDValueToReg(bc.GetLowReg(), hl.GetHigh()) 481 | } 482 | 483 | func opcode0x4D() { 484 | // LD C,L 485 | opcodesLDValueToReg(bc.GetLowReg(), hl.GetLow()) 486 | } 487 | 488 | func opcode0x4E() { 489 | // LD C,(HL) 490 | opcodesLDAddrToReg(bc.GetLowReg(), hl.GetValue()) 491 | } 492 | 493 | func opcode0x4F() { 494 | // LD C,A 495 | opcodesLDValueToReg(bc.GetLowReg(), af.GetHigh()) 496 | } 497 | 498 | func opcode0x50() { 499 | // LD D,B 500 | opcodesLDValueToReg(de.GetHighReg(), bc.GetHigh()) 501 | } 502 | 503 | func opcode0x51() { 504 | // LD D,C 505 | opcodesLDValueToReg(de.GetHighReg(), bc.GetLow()) 506 | } 507 | 508 | func opcode0x52() { 509 | // LD D,D 510 | opcodesLDValueToReg(de.GetHighReg(), de.GetHigh()) 511 | } 512 | 513 | func opcode0x53() { 514 | // LD D,E 515 | opcodesLDValueToReg(de.GetHighReg(), de.GetLow()) 516 | } 517 | 518 | func opcode0x54() { 519 | // LD D,H 520 | opcodesLDValueToReg(de.GetHighReg(), hl.GetHigh()) 521 | } 522 | 523 | func opcode0x55() { 524 | // LD D,L 525 | opcodesLDValueToReg(de.GetHighReg(), hl.GetLow()) 526 | } 527 | 528 | func opcode0x56() { 529 | // LD D,(HL) 530 | opcodesLDAddrToReg(de.GetHighReg(), hl.GetValue()) 531 | } 532 | 533 | func opcode0x57() { 534 | // LD D,A 535 | opcodesLDValueToReg(de.GetHighReg(), af.GetHigh()) 536 | } 537 | 538 | func opcode0x58() { 539 | // LD E,B 540 | opcodesLDValueToReg(de.GetLowReg(), bc.GetHigh()) 541 | } 542 | 543 | func opcode0x59() { 544 | // LD E,C 545 | opcodesLDValueToReg(de.GetLowReg(), bc.GetLow()) 546 | } 547 | 548 | func opcode0x5A() { 549 | // LD E,D 550 | opcodesLDValueToReg(de.GetLowReg(), de.GetHigh()) 551 | } 552 | 553 | func opcode0x5B() { 554 | // LD E,E 555 | opcodesLDValueToReg(de.GetLowReg(), de.GetLow()) 556 | } 557 | 558 | func opcode0x5C() { 559 | // LD E,H 560 | opcodesLDValueToReg(de.GetLowReg(), hl.GetHigh()) 561 | } 562 | 563 | func opcode0x5D() { 564 | // LD E,L 565 | opcodesLDValueToReg(de.GetLowReg(), hl.GetLow()) 566 | } 567 | 568 | func opcode0x5E() { 569 | // LD E,(HL) 570 | opcodesLDAddrToReg(de.GetLowReg(), hl.GetValue()) 571 | } 572 | 573 | func opcode0x5F() { 574 | // LD E,A 575 | opcodesLDValueToReg(de.GetLowReg(), af.GetHigh()) 576 | } 577 | 578 | func opcode0x60() { 579 | // LD H,B 580 | opcodesLDValueToReg(hl.GetHighReg(), bc.GetHigh()) 581 | } 582 | 583 | func opcode0x61() { 584 | // LD H,C 585 | opcodesLDValueToReg(hl.GetHighReg(), bc.GetLow()) 586 | } 587 | 588 | func opcode0x62() { 589 | // LD H,D 590 | opcodesLDValueToReg(hl.GetHighReg(), de.GetHigh()) 591 | } 592 | 593 | func opcode0x63() { 594 | // LD H,E 595 | opcodesLDValueToReg(hl.GetHighReg(), de.GetLow()) 596 | } 597 | 598 | func opcode0x64() { 599 | // LD H,H 600 | opcodesLDValueToReg(hl.GetHighReg(), hl.GetHigh()) 601 | } 602 | 603 | func opcode0x65() { 604 | // LD H,L 605 | opcodesLDValueToReg(hl.GetHighReg(), hl.GetLow()) 606 | } 607 | 608 | func opcode0x66() { 609 | // LD H,(HL) 610 | opcodesLDAddrToReg(hl.GetHighReg(), hl.GetValue()) 611 | } 612 | 613 | func opcode0x67() { 614 | // LD H,A 615 | opcodesLDValueToReg(hl.GetHighReg(), af.GetHigh()) 616 | } 617 | 618 | func opcode0x68() { 619 | // LD L,B 620 | opcodesLDValueToReg(hl.GetLowReg(), bc.GetHigh()) 621 | } 622 | 623 | func opcode0x69() { 624 | // LD L,C 625 | opcodesLDValueToReg(hl.GetLowReg(), bc.GetLow()) 626 | } 627 | 628 | func opcode0x6A() { 629 | // LD L,D 630 | opcodesLDValueToReg(hl.GetLowReg(), de.GetHigh()) 631 | } 632 | 633 | func opcode0x6B() { 634 | // LD L,E 635 | opcodesLDValueToReg(hl.GetLowReg(), de.GetLow()) 636 | } 637 | 638 | func opcode0x6C() { 639 | // LD L,H 640 | opcodesLDValueToReg(hl.GetLowReg(), hl.GetHigh()) 641 | } 642 | 643 | func opcode0x6D() { 644 | // LD L,L 645 | opcodesLDValueToReg(hl.GetLowReg(), hl.GetLow()) 646 | } 647 | 648 | func opcode0x6E() { 649 | // LD L,(HL) 650 | opcodesLDAddrToReg(hl.GetLowReg(), hl.GetValue()) 651 | } 652 | 653 | func opcode0x6F() { 654 | // LD L,A 655 | opcodesLDValueToReg(hl.GetLowReg(), af.GetHigh()) 656 | } 657 | 658 | func opcode0x70() { 659 | // LD (HL),B 660 | opcodesLDValueToAddr(hl.GetValue(), bc.GetHigh()) 661 | } 662 | 663 | func opcode0x71() { 664 | // LD (HL),C 665 | opcodesLDValueToAddr(hl.GetValue(), bc.GetLow()) 666 | } 667 | 668 | func opcode0x72() { 669 | // LD (HL),D 670 | opcodesLDValueToAddr(hl.GetValue(), de.GetHigh()) 671 | } 672 | 673 | func opcode0x73() { 674 | // LD (HL),E 675 | opcodesLDValueToAddr(hl.GetValue(), de.GetLow()) 676 | } 677 | 678 | func opcode0x74() { 679 | // LD (HL),H 680 | opcodesLDValueToAddr(hl.GetValue(), hl.GetHigh()) 681 | } 682 | 683 | func opcode0x75() { 684 | // LD (HL),L 685 | opcodesLDValueToAddr(hl.GetValue(), hl.GetLow()) 686 | } 687 | 688 | func opcode0x76() { 689 | // HALT 690 | if imeCycles > 0 { 691 | // If EI is pending interrupts are triggered before Halt 692 | imeCycles = 0 693 | ime = true 694 | pc.Decrement() 695 | } else { 696 | ifreg := mem.Read(0xFF0F) 697 | iereg := mem.Read(0xFFFF) 698 | 699 | halted = true 700 | 701 | // if there is an interrupt pending and 702 | // the cpu is halted it fails to advance the PC register 703 | // once the cpu resumes operation 704 | // this bug is present in all the original DMGs 705 | if !ime && ((ifreg & iereg & 0x1F) != 0) { 706 | skipPCBug = true 707 | } 708 | } 709 | } 710 | 711 | func opcode0x77() { 712 | // LD (HL),A 713 | opcodesLDValueToAddr(hl.GetValue(), af.GetHigh()) 714 | } 715 | 716 | func opcode0x78() { 717 | // LD A,B 718 | opcodesLDValueToReg(af.GetHighReg(), bc.GetHigh()) 719 | } 720 | 721 | func opcode0x79() { 722 | // LD A,C 723 | opcodesLDValueToReg(af.GetHighReg(), bc.GetLow()) 724 | } 725 | 726 | func opcode0x7A() { 727 | // LD A,D 728 | opcodesLDValueToReg(af.GetHighReg(), de.GetHigh()) 729 | } 730 | 731 | func opcode0x7B() { 732 | // LD A,E 733 | opcodesLDValueToReg(af.GetHighReg(), de.GetLow()) 734 | } 735 | 736 | func opcode0x7C() { 737 | // LD A,H 738 | opcodesLDValueToReg(af.GetHighReg(), hl.GetHigh()) 739 | } 740 | 741 | func opcode0x7D() { 742 | // LD A,L 743 | opcodesLDValueToReg(af.GetHighReg(), hl.GetLow()) 744 | } 745 | 746 | func opcode0x7E() { 747 | // LD A,(HL) 748 | opcodesLDAddrToReg(af.GetHighReg(), hl.GetValue()) 749 | } 750 | 751 | func opcode0x7F() { 752 | // LD A,A 753 | opcodesLDValueToReg(af.GetHighReg(), af.GetHigh()) 754 | } 755 | 756 | func opcode0x80() { 757 | // ADD A,B 758 | opcodesADD(bc.GetHigh()) 759 | } 760 | 761 | func opcode0x81() { 762 | // ADD A,C 763 | opcodesADD(bc.GetLow()) 764 | } 765 | 766 | func opcode0x82() { 767 | // ADD A,D 768 | opcodesADD(de.GetHigh()) 769 | } 770 | 771 | func opcode0x83() { 772 | // ADD A,E 773 | opcodesADD(de.GetLow()) 774 | } 775 | 776 | func opcode0x84() { 777 | // ADD A,H 778 | opcodesADD(hl.GetHigh()) 779 | } 780 | 781 | func opcode0x85() { 782 | // ADD A,L 783 | opcodesADD(hl.GetLow()) 784 | } 785 | 786 | func opcode0x86() { 787 | // ADD A,(HL) 788 | opcodesADD(mem.Read(hl.GetValue())) 789 | } 790 | 791 | func opcode0x87() { 792 | // ADD A,A 793 | opcodesADD(af.GetHigh()) 794 | } 795 | 796 | func opcode0x88() { 797 | // ADC A,B 798 | opcodesADC(bc.GetHigh()) 799 | } 800 | 801 | func opcode0x89() { 802 | // ADC A,C 803 | opcodesADC(bc.GetLow()) 804 | } 805 | 806 | func opcode0x8A() { 807 | // ADC A,D 808 | opcodesADC(de.GetHigh()) 809 | } 810 | 811 | func opcode0x8B() { 812 | // ADC A,E 813 | opcodesADC(de.GetLow()) 814 | } 815 | 816 | func opcode0x8C() { 817 | // ADC A,H 818 | opcodesADC(hl.GetHigh()) 819 | } 820 | 821 | func opcode0x8D() { 822 | // ADC A,L 823 | opcodesADC(hl.GetLow()) 824 | } 825 | 826 | func opcode0x8E() { 827 | // ADC A,(HL) 828 | opcodesADC(mem.Read(hl.GetValue())) 829 | } 830 | 831 | func opcode0x8F() { 832 | // ADC A,A 833 | opcodesADC(af.GetHigh()) 834 | } 835 | 836 | func opcode0x90() { 837 | // SUB B 838 | opcodesSUB(bc.GetHigh()) 839 | } 840 | 841 | func opcode0x91() { 842 | // SUB C 843 | opcodesSUB(bc.GetLow()) 844 | } 845 | 846 | func opcode0x92() { 847 | // SUB D 848 | opcodesSUB(de.GetHigh()) 849 | } 850 | 851 | func opcode0x93() { 852 | // SUB E 853 | opcodesSUB(de.GetLow()) 854 | } 855 | 856 | func opcode0x94() { 857 | // SUB H 858 | opcodesSUB(hl.GetHigh()) 859 | } 860 | 861 | func opcode0x95() { 862 | // SUB L 863 | opcodesSUB(hl.GetLow()) 864 | } 865 | 866 | func opcode0x96() { 867 | // SUB (HL) 868 | opcodesSUB(mem.Read(hl.GetValue())) 869 | } 870 | 871 | func opcode0x97() { 872 | // SUB A 873 | opcodesSUB(af.GetHigh()) 874 | } 875 | 876 | func opcode0x98() { 877 | // SBC B 878 | opcodesSBC(bc.GetHigh()) 879 | } 880 | 881 | func opcode0x99() { 882 | // SBC C 883 | opcodesSBC(bc.GetLow()) 884 | } 885 | 886 | func opcode0x9A() { 887 | // SBC D 888 | opcodesSBC(de.GetHigh()) 889 | } 890 | 891 | func opcode0x9B() { 892 | // SBC E 893 | opcodesSBC(de.GetLow()) 894 | } 895 | 896 | func opcode0x9C() { 897 | // SBC H 898 | opcodesSBC(hl.GetHigh()) 899 | } 900 | 901 | func opcode0x9D() { 902 | // SBC L 903 | opcodesSBC(hl.GetLow()) 904 | } 905 | 906 | func opcode0x9E() { 907 | // SBC (HL) 908 | opcodesSBC(mem.Read(hl.GetValue())) 909 | } 910 | 911 | func opcode0x9F() { 912 | // SBC A 913 | opcodesSBC(af.GetHigh()) 914 | } 915 | 916 | func opcode0xA0() { 917 | // AND B 918 | opcodesAND(bc.GetHigh()) 919 | } 920 | 921 | func opcode0xA1() { 922 | // AND C 923 | opcodesAND(bc.GetLow()) 924 | } 925 | 926 | func opcode0xA2() { 927 | // AND D 928 | opcodesAND(de.GetHigh()) 929 | } 930 | 931 | func opcode0xA3() { 932 | // AND E 933 | opcodesAND(de.GetLow()) 934 | } 935 | 936 | func opcode0xA4() { 937 | // AND H 938 | opcodesAND(hl.GetHigh()) 939 | } 940 | 941 | func opcode0xA5() { 942 | // AND L 943 | opcodesAND(hl.GetLow()) 944 | } 945 | 946 | func opcode0xA6() { 947 | // AND (HL) 948 | opcodesAND(mem.Read(hl.GetValue())) 949 | } 950 | 951 | func opcode0xA7() { 952 | // AND A 953 | opcodesAND(af.GetHigh()) 954 | } 955 | 956 | func opcode0xA8() { 957 | // XOR B 958 | opcodesXOR(bc.GetHigh()) 959 | } 960 | 961 | func opcode0xA9() { 962 | // XOR C 963 | opcodesXOR(bc.GetLow()) 964 | } 965 | 966 | func opcode0xAA() { 967 | // XOR D 968 | opcodesXOR(de.GetHigh()) 969 | } 970 | 971 | func opcode0xAB() { 972 | // XOR E 973 | opcodesXOR(de.GetLow()) 974 | } 975 | 976 | func opcode0xAC() { 977 | // XOR H 978 | opcodesXOR(hl.GetHigh()) 979 | } 980 | 981 | func opcode0xAD() { 982 | // XOR L 983 | opcodesXOR(hl.GetLow()) 984 | } 985 | 986 | func opcode0xAE() { 987 | // XOR (HL) 988 | opcodesXOR(mem.Read(hl.GetValue())) 989 | } 990 | 991 | func opcode0xAF() { 992 | // XOR A 993 | opcodesXOR(af.GetHigh()) 994 | } 995 | 996 | func opcode0xB0() { 997 | // OR B 998 | opcodesOR(bc.GetHigh()) 999 | } 1000 | 1001 | func opcode0xB1() { 1002 | // OR C 1003 | opcodesOR(bc.GetLow()) 1004 | } 1005 | 1006 | func opcode0xB2() { 1007 | // OR D 1008 | opcodesOR(de.GetHigh()) 1009 | } 1010 | 1011 | func opcode0xB3() { 1012 | // OR E 1013 | opcodesOR(de.GetLow()) 1014 | } 1015 | 1016 | func opcode0xB4() { 1017 | // OR H 1018 | opcodesOR(hl.GetHigh()) 1019 | } 1020 | 1021 | func opcode0xB5() { 1022 | // OR L 1023 | opcodesOR(hl.GetLow()) 1024 | } 1025 | 1026 | func opcode0xB6() { 1027 | // OR (HL) 1028 | opcodesOR(mem.Read(hl.GetValue())) 1029 | } 1030 | 1031 | func opcode0xB7() { 1032 | // OR A 1033 | opcodesOR(af.GetHigh()) 1034 | } 1035 | 1036 | func opcode0xB8() { 1037 | // CP B 1038 | opcodesCP(bc.GetHigh()) 1039 | } 1040 | 1041 | func opcode0xB9() { 1042 | // CP C 1043 | opcodesCP(bc.GetLow()) 1044 | } 1045 | 1046 | func opcode0xBA() { 1047 | // CP D 1048 | opcodesCP(de.GetHigh()) 1049 | } 1050 | 1051 | func opcode0xBB() { 1052 | // CP E 1053 | opcodesCP(de.GetLow()) 1054 | } 1055 | 1056 | func opcode0xBC() { 1057 | // CP H 1058 | opcodesCP(hl.GetHigh()) 1059 | } 1060 | 1061 | func opcode0xBD() { 1062 | // CP L 1063 | opcodesCP(hl.GetLow()) 1064 | } 1065 | 1066 | func opcode0xBE() { 1067 | // CP (HL) 1068 | opcodesCP(mem.Read(hl.GetValue())) 1069 | } 1070 | 1071 | func opcode0xBF() { 1072 | // CP A 1073 | opcodesCP(af.GetHigh()) 1074 | } 1075 | 1076 | func opcode0xC0() { 1077 | // RET NZ 1078 | if !isSetFlag(flagZero) { 1079 | stackPop(&pc) 1080 | branchTaken = true 1081 | } 1082 | } 1083 | 1084 | func opcode0xC1() { 1085 | // POP BC 1086 | stackPop(&bc) 1087 | } 1088 | 1089 | func opcode0xC2() { 1090 | // JP NZ,nn 1091 | if !isSetFlag(flagZero) { 1092 | l := mem.Read(pc.GetValue()) 1093 | pc.Increment() 1094 | h := mem.Read(pc.GetValue()) 1095 | pc.SetHigh(h) 1096 | pc.SetLow(l) 1097 | branchTaken = true 1098 | } else { 1099 | pc.Increment() 1100 | pc.Increment() 1101 | } 1102 | } 1103 | 1104 | func opcode0xC3() { 1105 | // JP nn 1106 | l := mem.Read(pc.GetValue()) 1107 | pc.Increment() 1108 | h := mem.Read(pc.GetValue()) 1109 | pc.SetHigh(h) 1110 | pc.SetLow(l) 1111 | } 1112 | 1113 | func opcode0xC4() { 1114 | // CALL NZ,nn 1115 | if !isSetFlag(flagZero) { 1116 | l := mem.Read(pc.GetValue()) 1117 | pc.Increment() 1118 | h := mem.Read(pc.GetValue()) 1119 | pc.Increment() 1120 | stackPush(&pc) 1121 | pc.SetHigh(h) 1122 | pc.SetLow(l) 1123 | branchTaken = true 1124 | } else { 1125 | pc.Increment() 1126 | pc.Increment() 1127 | } 1128 | } 1129 | 1130 | func opcode0xC5() { 1131 | // PUSH BC 1132 | stackPush(&bc) 1133 | } 1134 | 1135 | func opcode0xC6() { 1136 | // ADD A,n 1137 | opcodesADD(mem.Read(pc.GetValue())) 1138 | pc.Increment() 1139 | } 1140 | 1141 | func opcode0xC7() { 1142 | // RST 00H 1143 | stackPush(&pc) 1144 | pc.SetValue(0x0000) 1145 | } 1146 | 1147 | func opcode0xC8() { 1148 | // RET Z 1149 | if isSetFlag(flagZero) { 1150 | stackPop(&pc) 1151 | branchTaken = true 1152 | } 1153 | } 1154 | 1155 | func opcode0xC9() { 1156 | // RET 1157 | stackPop(&pc) 1158 | } 1159 | 1160 | func opcode0xCA() { 1161 | // JP Z,nn 1162 | if isSetFlag(flagZero) { 1163 | l := mem.Read(pc.GetValue()) 1164 | pc.Increment() 1165 | h := mem.Read(pc.GetValue()) 1166 | pc.SetHigh(h) 1167 | pc.SetLow(l) 1168 | branchTaken = true 1169 | } else { 1170 | pc.Increment() 1171 | pc.Increment() 1172 | } 1173 | } 1174 | 1175 | func opcode0xCB() { 1176 | // CB prefixed instruction 1177 | } 1178 | 1179 | func opcode0xCC() { 1180 | // CALL Z,nn 1181 | if isSetFlag(flagZero) { 1182 | l := mem.Read(pc.GetValue()) 1183 | pc.Increment() 1184 | h := mem.Read(pc.GetValue()) 1185 | pc.Increment() 1186 | stackPush(&pc) 1187 | pc.SetHigh(h) 1188 | pc.SetLow(l) 1189 | branchTaken = true 1190 | } else { 1191 | pc.Increment() 1192 | pc.Increment() 1193 | } 1194 | } 1195 | 1196 | func opcode0xCD() { 1197 | // CALL nn 1198 | l := mem.Read(pc.GetValue()) 1199 | pc.Increment() 1200 | h := mem.Read(pc.GetValue()) 1201 | pc.Increment() 1202 | stackPush(&pc) 1203 | pc.SetHigh(h) 1204 | pc.SetLow(l) 1205 | } 1206 | 1207 | func opcode0xCE() { 1208 | // ADC A,n 1209 | opcodesADC(mem.Read(pc.GetValue())) 1210 | pc.Increment() 1211 | } 1212 | 1213 | func opcode0xCF() { 1214 | // RST 08H 1215 | stackPush(&pc) 1216 | pc.SetValue(0x0008) 1217 | } 1218 | 1219 | func opcode0xD0() { 1220 | // RET NC 1221 | if !isSetFlag(flagCarry) { 1222 | stackPop(&pc) 1223 | branchTaken = true 1224 | } 1225 | } 1226 | 1227 | func opcode0xD1() { 1228 | // POP DE 1229 | stackPop(&de) 1230 | } 1231 | 1232 | func opcode0xD2() { 1233 | // JP NC,nn 1234 | if !isSetFlag(flagCarry) { 1235 | l := mem.Read(pc.GetValue()) 1236 | pc.Increment() 1237 | h := mem.Read(pc.GetValue()) 1238 | pc.SetHigh(h) 1239 | pc.SetLow(l) 1240 | branchTaken = true 1241 | } else { 1242 | pc.Increment() 1243 | pc.Increment() 1244 | } 1245 | } 1246 | 1247 | func opcode0xD3() { 1248 | invalidOPCode() 1249 | } 1250 | 1251 | func opcode0xD4() { 1252 | // CALL NC,nn 1253 | if !isSetFlag(flagCarry) { 1254 | l := mem.Read(pc.GetValue()) 1255 | pc.Increment() 1256 | h := mem.Read(pc.GetValue()) 1257 | pc.Increment() 1258 | stackPush(&pc) 1259 | pc.SetHigh(h) 1260 | pc.SetLow(l) 1261 | branchTaken = true 1262 | } else { 1263 | pc.Increment() 1264 | pc.Increment() 1265 | } 1266 | } 1267 | 1268 | func opcode0xD5() { 1269 | // PUSH DE 1270 | stackPush(&de) 1271 | } 1272 | 1273 | func opcode0xD6() { 1274 | // SUB n 1275 | opcodesSUB(mem.Read(pc.GetValue())) 1276 | pc.Increment() 1277 | } 1278 | 1279 | func opcode0xD7() { 1280 | // RST 10H 1281 | stackPush(&pc) 1282 | pc.SetValue(0x0010) 1283 | } 1284 | 1285 | func opcode0xD8() { 1286 | // RET C 1287 | if isSetFlag(flagCarry) { 1288 | stackPop(&pc) 1289 | branchTaken = true 1290 | } 1291 | } 1292 | 1293 | func opcode0xD9() { 1294 | // RETI 1295 | stackPop(&pc) 1296 | ime = true 1297 | } 1298 | 1299 | func opcode0xDA() { 1300 | // JP C,nn 1301 | if isSetFlag(flagCarry) { 1302 | l := mem.Read(pc.GetValue()) 1303 | pc.Increment() 1304 | h := mem.Read(pc.GetValue()) 1305 | pc.SetHigh(h) 1306 | pc.SetLow(l) 1307 | branchTaken = true 1308 | } else { 1309 | pc.Increment() 1310 | pc.Increment() 1311 | } 1312 | } 1313 | 1314 | func opcode0xDB() { 1315 | invalidOPCode() 1316 | } 1317 | 1318 | func opcode0xDC() { 1319 | // CALL C,nn 1320 | if isSetFlag(flagCarry) { 1321 | l := mem.Read(pc.GetValue()) 1322 | pc.Increment() 1323 | h := mem.Read(pc.GetValue()) 1324 | pc.Increment() 1325 | stackPush(&pc) 1326 | pc.SetHigh(h) 1327 | pc.SetLow(l) 1328 | branchTaken = true 1329 | } else { 1330 | pc.Increment() 1331 | pc.Increment() 1332 | } 1333 | } 1334 | 1335 | func opcode0xDD() { 1336 | invalidOPCode() 1337 | } 1338 | 1339 | func opcode0xDE() { 1340 | // SBC n 1341 | opcodesSBC(mem.Read(pc.GetValue())) 1342 | pc.Increment() 1343 | } 1344 | 1345 | func opcode0xDF() { 1346 | // RST 18H 1347 | stackPush(&pc) 1348 | pc.SetValue(0x0018) 1349 | } 1350 | 1351 | func opcode0xE0() { 1352 | // LD (0xFF00+n),A 1353 | opcodesLDValueToAddr(0xFF00+uint16(mem.Read(pc.GetValue())), af.GetHigh()) 1354 | pc.Increment() 1355 | } 1356 | 1357 | func opcode0xE1() { 1358 | // POP HL 1359 | stackPop(&hl) 1360 | } 1361 | 1362 | func opcode0xE2() { 1363 | // LD (0xFF00+C),A 1364 | opcodesLDValueToAddr(0xFF00+uint16(bc.GetLow()), af.GetHigh()) 1365 | } 1366 | 1367 | func opcode0xE3() { 1368 | invalidOPCode() 1369 | } 1370 | 1371 | func opcode0xE4() { 1372 | invalidOPCode() 1373 | } 1374 | 1375 | func opcode0xE5() { 1376 | // PUSH HL 1377 | stackPush(&hl) 1378 | } 1379 | 1380 | func opcode0xE6() { 1381 | // AND n 1382 | opcodesAND(mem.Read(pc.GetValue())) 1383 | pc.Increment() 1384 | } 1385 | 1386 | func opcode0xE7() { 1387 | // RST 20H 1388 | stackPush(&pc) 1389 | pc.SetValue(0x0020) 1390 | } 1391 | 1392 | func opcode0xE8() { 1393 | // ADD SP,n 1394 | opcodesADDSP(int8(mem.Read(pc.GetValue()))) 1395 | pc.Increment() 1396 | } 1397 | 1398 | func opcode0xE9() { 1399 | // JP (HL) 1400 | pc.SetValue(hl.GetValue()) 1401 | } 1402 | 1403 | func opcode0xEA() { 1404 | // LD (nn),A 1405 | var tmp SixteenBitReg 1406 | tmp.SetLow(mem.Read(pc.GetValue())) 1407 | pc.Increment() 1408 | tmp.SetHigh(mem.Read(pc.GetValue())) 1409 | pc.Increment() 1410 | opcodesLDValueToAddr(tmp.GetValue(), af.GetHigh()) 1411 | } 1412 | 1413 | func opcode0xEB() { 1414 | invalidOPCode() 1415 | } 1416 | 1417 | func opcode0xEC() { 1418 | invalidOPCode() 1419 | } 1420 | 1421 | func opcode0xED() { 1422 | invalidOPCode() 1423 | } 1424 | 1425 | func opcode0xEE() { 1426 | // XOR n 1427 | opcodesXOR(mem.Read(pc.GetValue())) 1428 | pc.Increment() 1429 | } 1430 | 1431 | func opcode0xEF() { 1432 | // RST 28H 1433 | stackPush(&pc) 1434 | pc.SetValue(0x28) 1435 | } 1436 | 1437 | func opcode0xF0() { 1438 | // LD A,(0xFF00+n) 1439 | opcodesLDAddrToReg(af.GetHighReg(), 0xFF00+uint16(mem.Read(pc.GetValue()))) 1440 | pc.Increment() 1441 | } 1442 | 1443 | func opcode0xF1() { 1444 | // POP AF 1445 | stackPop(&af) 1446 | af.SetLow(af.GetLow() & 0xF0) 1447 | } 1448 | 1449 | func opcode0xF2() { 1450 | // LD A,(C) 1451 | opcodesLDAddrToReg(af.GetHighReg(), 0xFF00+uint16(bc.GetLow())) 1452 | } 1453 | 1454 | func opcode0xF3() { 1455 | // DI 1456 | ime = false 1457 | imeCycles = 0 1458 | } 1459 | 1460 | func opcode0xF4() { 1461 | invalidOPCode() 1462 | } 1463 | 1464 | func opcode0xF5() { 1465 | // PUSH AF 1466 | stackPush(&af) 1467 | } 1468 | 1469 | func opcode0xF6() { 1470 | // OR n 1471 | opcodesOR(mem.Read(pc.GetValue())) 1472 | pc.Increment() 1473 | } 1474 | 1475 | func opcode0xF7() { 1476 | // RST 30H 1477 | stackPush(&pc) 1478 | pc.SetValue(0x0030) 1479 | } 1480 | 1481 | func opcode0xF8() { 1482 | // LD HL,SP+n 1483 | offset := int8(mem.Read(pc.GetValue())) 1484 | value := int(sp.GetValue()) + int(offset) 1485 | result := uint16(value) 1486 | clearAllFlags() 1487 | if ((sp.GetValue() ^ uint16(offset) ^ result) & 0x100) == 0x100 { 1488 | setFlag(flagCarry) 1489 | } 1490 | if ((sp.GetValue() ^ uint16(offset) ^ result) & 0x10) == 0x10 { 1491 | setFlag(flagHalf) 1492 | } 1493 | hl.SetValue(result) 1494 | pc.Increment() 1495 | } 1496 | 1497 | func opcode0xF9() { 1498 | // LD SP,HL 1499 | sp.SetValue(hl.GetValue()) 1500 | } 1501 | 1502 | func opcode0xFA() { 1503 | // LD A,(nn) 1504 | var tmp SixteenBitReg 1505 | tmp.SetLow(mem.Read(pc.GetValue())) 1506 | pc.Increment() 1507 | tmp.SetHigh(mem.Read(pc.GetValue())) 1508 | pc.Increment() 1509 | opcodesLDAddrToReg(af.GetHighReg(), tmp.GetValue()) 1510 | } 1511 | 1512 | func opcode0xFB() { 1513 | // EI 1514 | imeCycles = (int(machineCycles[0xFB]) * 4) + 1 1515 | } 1516 | 1517 | func opcode0xFC() { 1518 | invalidOPCode() 1519 | } 1520 | 1521 | func opcode0xFD() { 1522 | invalidOPCode() 1523 | } 1524 | 1525 | func opcode0xFE() { 1526 | // CP n 1527 | opcodesCP(mem.Read(pc.GetValue())) 1528 | pc.Increment() 1529 | } 1530 | 1531 | func opcode0xFF() { 1532 | // RST 38H 1533 | stackPush(&pc) 1534 | pc.SetValue(0x0038) 1535 | } 1536 | -------------------------------------------------------------------------------- /gb/cpu/registers.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | // EightBitReg models an 8 bit processor register 4 | type EightBitReg struct { 5 | value uint8 6 | } 7 | 8 | // SixteenBitReg models a 16 bit processor register 9 | type SixteenBitReg struct { 10 | high EightBitReg 11 | low EightBitReg 12 | } 13 | 14 | // SetValue sets the 8 bit value of the register 15 | func (reg *EightBitReg) SetValue(value uint8) { 16 | reg.value = value 17 | } 18 | 19 | // GetValue returns the 8 bit value of the register 20 | func (reg *EightBitReg) GetValue() uint8 { 21 | return reg.value 22 | } 23 | 24 | // Increment increments (++) the 8 bit value of the register 25 | func (reg *EightBitReg) Increment() { 26 | reg.value++ 27 | } 28 | 29 | // Decrement decrements (--) the 8 bit value of the register 30 | func (reg *EightBitReg) Decrement() { 31 | reg.value-- 32 | } 33 | 34 | // SetHigh sets the 8 bit value of the 16 bit higher part 35 | func (reg *SixteenBitReg) SetHigh(value uint8) { 36 | reg.high.value = value 37 | } 38 | 39 | // GetHigh returns the 8 bit value of the 16 bit higher part 40 | func (reg *SixteenBitReg) GetHigh() uint8 { 41 | return reg.high.value 42 | } 43 | 44 | // GetHighReg returns the 8 bit register of the 16 bit higher part 45 | func (reg *SixteenBitReg) GetHighReg() *EightBitReg { 46 | return ®.high 47 | } 48 | 49 | // SetLow sets the 8 bit value of the 16 bit lower part 50 | func (reg *SixteenBitReg) SetLow(value uint8) { 51 | reg.low.value = value 52 | } 53 | 54 | // GetLow returns the 8 bit value of the 16 bit lower part 55 | func (reg *SixteenBitReg) GetLow() uint8 { 56 | return reg.low.value 57 | } 58 | 59 | // GetLowReg returns the 8 bit register of the 16 bit lower part 60 | func (reg *SixteenBitReg) GetLowReg() *EightBitReg { 61 | return ®.low 62 | } 63 | 64 | // SetValue sets the 16 bit value of the register 65 | func (reg *SixteenBitReg) SetValue(value uint16) { 66 | reg.low.SetValue(uint8(value & 0xFF)) 67 | reg.high.SetValue(uint8((value >> 8) & 0xFF)) 68 | } 69 | 70 | // GetValue returns the 16 bit value of the register 71 | func (reg *SixteenBitReg) GetValue() uint16 { 72 | high := uint16(reg.high.GetValue()) 73 | low := uint16(reg.low.GetValue()) 74 | return (high << 8) | low 75 | } 76 | 77 | // Increment increments (++) the 16 bit value of the register 78 | func (reg *SixteenBitReg) Increment() { 79 | value := reg.GetValue() 80 | value++ 81 | reg.SetValue(value) 82 | } 83 | 84 | // Decrement decrements (--) the 16 bit value of the register 85 | func (reg *SixteenBitReg) Decrement() { 86 | value := reg.GetValue() 87 | value-- 88 | reg.SetValue(value) 89 | } 90 | -------------------------------------------------------------------------------- /gb/cpu/serial.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | import "github.com/drhelius/demo-emulator/gb/util" 4 | 5 | var ( 6 | serialBit int 7 | serialCycles uint 8 | ) 9 | 10 | func updateSerial() { 11 | sc := mem.Read(0xFF02) 12 | 13 | if util.IsSetBit(sc, 7) && util.IsSetBit(sc, 0) { 14 | serialCycles += clockCycles 15 | 16 | if serialBit < 0 { 17 | serialBit = 0 18 | serialCycles = 0 19 | return 20 | } 21 | 22 | if serialCycles >= 512 { 23 | if serialBit > 7 { 24 | mem.Write(0xFF02, sc&0x7F) 25 | RequestInterrupt(InterruptSerial) 26 | serialBit = -1 27 | return 28 | } 29 | 30 | sb := mem.Read(0xFF01) 31 | sb <<= 1 32 | sb |= 0x01 33 | mem.Write(0xFF01, sb) 34 | 35 | serialCycles -= 512 36 | serialBit++ 37 | } 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /gb/cpu/timers.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | import "github.com/drhelius/demo-emulator/gb/util" 4 | 5 | var ( 6 | divCycles uint 7 | timaCycles uint 8 | ) 9 | 10 | // ResetDivCycles sets divCycles to 0 11 | func ResetDivCycles() { 12 | divCycles = 0 13 | } 14 | 15 | // ResetTimaCycles sets timaCycles to 0 16 | func ResetTimaCycles() { 17 | timaCycles = 0 18 | } 19 | 20 | func updateTimers() { 21 | divCycles += clockCycles 22 | 23 | for divCycles >= 256 { 24 | divCycles -= 256 25 | div := mem.Read(0xFF04) 26 | div++ 27 | mem.Write(0xFF04, div) 28 | } 29 | 30 | tac := mem.Read(0xFF07) 31 | 32 | // if tima is running 33 | if util.IsSetBit(tac, 2) { 34 | timaCycles += clockCycles 35 | 36 | var freq uint 37 | 38 | switch tac & 0x03 { 39 | case 0: 40 | freq = 1024 41 | case 1: 42 | freq = 16 43 | case 2: 44 | freq = 64 45 | case 3: 46 | freq = 256 47 | } 48 | 49 | for timaCycles >= freq { 50 | timaCycles -= freq 51 | tima := mem.Read(0xFF05) 52 | 53 | if tima == 0xFF { 54 | tima = mem.Read(0xFF06) 55 | RequestInterrupt(InterruptTimer) 56 | } else { 57 | tima++ 58 | } 59 | 60 | mem.Write(0xFF05, tima) 61 | } 62 | } 63 | } 64 | -------------------------------------------------------------------------------- /gb/cpu/timing.go: -------------------------------------------------------------------------------- 1 | package cpu 2 | 3 | // machine cycles for normal opcodes 4 | var machineCycles = [256]uint{ 5 | 1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, 6 | 1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, 7 | 2, 3, 2, 2, 1, 1, 2, 1, 2, 2, 2, 2, 1, 1, 2, 1, 8 | 2, 3, 2, 2, 3, 3, 3, 1, 2, 2, 2, 2, 1, 1, 2, 1, 9 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 10 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 11 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 12 | 2, 2, 2, 2, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 13 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 14 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 15 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 16 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 17 | 2, 3, 3, 4, 3, 4, 2, 4, 2, 4, 3, 0, 3, 6, 2, 4, 18 | 2, 3, 3, 0, 3, 4, 2, 4, 2, 4, 3, 0, 3, 0, 2, 4, 19 | 3, 3, 2, 0, 0, 4, 2, 4, 4, 1, 4, 0, 0, 0, 2, 4, 20 | 3, 3, 2, 1, 0, 4, 2, 4, 3, 2, 4, 1, 0, 0, 2, 4} 21 | 22 | // machine cycles for normal opcodes plus cycles used in branches 23 | var machineCyclesBranched = [256]uint{ 24 | 1, 3, 2, 2, 1, 1, 2, 1, 5, 2, 2, 2, 1, 1, 2, 1, 25 | 1, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, 26 | 3, 3, 2, 2, 1, 1, 2, 1, 3, 2, 2, 2, 1, 1, 2, 1, 27 | 3, 3, 2, 2, 3, 3, 3, 1, 3, 2, 2, 2, 1, 1, 2, 1, 28 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 29 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 30 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 31 | 2, 2, 2, 2, 2, 2, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 32 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 33 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 34 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 35 | 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 2, 1, 36 | 5, 3, 4, 4, 6, 4, 2, 4, 5, 4, 4, 0, 6, 6, 2, 4, 37 | 5, 3, 4, 0, 6, 4, 2, 4, 5, 4, 4, 0, 6, 0, 2, 4, 38 | 3, 3, 2, 0, 0, 4, 2, 4, 4, 1, 4, 0, 0, 0, 2, 4, 39 | 3, 3, 2, 1, 0, 4, 2, 4, 3, 2, 4, 1, 0, 0, 2, 4} 40 | 41 | // machine cycles for CB opcodes 42 | var machineCyclesCB = [256]uint{ 43 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 44 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 45 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 46 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 47 | 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 48 | 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 49 | 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 50 | 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 2, 2, 2, 2, 3, 2, 51 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 52 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 53 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 54 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 55 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 56 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 57 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2, 58 | 2, 2, 2, 2, 2, 2, 4, 2, 2, 2, 2, 2, 2, 2, 4, 2} 59 | -------------------------------------------------------------------------------- /gb/input/input.go: -------------------------------------------------------------------------------- 1 | package input 2 | 3 | import ( 4 | "github.com/drhelius/demo-emulator/gb/cpu" 5 | "github.com/drhelius/demo-emulator/gb/util" 6 | ) 7 | 8 | var ( 9 | joypadState uint8 10 | p1 uint8 11 | inputCycles uint 12 | ) 13 | 14 | func init() { 15 | joypadState = 0xFF 16 | p1 = 0xFF 17 | } 18 | 19 | // Tick runs the input eumulation n cycles 20 | func Tick(cycles uint) { 21 | inputCycles += cycles 22 | 23 | // Joypad Poll Speed (64 Hz) 24 | if inputCycles >= 65536 { 25 | inputCycles -= 65536 26 | update() 27 | } 28 | } 29 | 30 | // Read returns the P1 register 31 | func Read() uint8 { 32 | return p1 33 | } 34 | 35 | // Write stores the P1 register 36 | func Write(value uint8) { 37 | p1 = (p1 & 0xCF) | (value & 0x30) 38 | update() 39 | } 40 | 41 | // ButtonPressed tells the input system that a button has been pressed 42 | func ButtonPressed(button util.GameboyButton) { 43 | joypadState = util.UnsetBit(joypadState, uint8(button)) 44 | } 45 | 46 | // ButtonReleased tells the input system that a button has been released 47 | func ButtonReleased(button util.GameboyButton) { 48 | joypadState = util.SetBit(joypadState, uint8(button)) 49 | } 50 | 51 | func update() { 52 | current := p1 & 0xF0 53 | 54 | switch current & 0x30 { 55 | case 0x10: 56 | topJoypad := (joypadState >> 4) & 0x0F 57 | current |= topJoypad 58 | case 0x20: 59 | bottomJoypad := joypadState & 0x0F 60 | current |= bottomJoypad 61 | case 0x30: 62 | current |= 0x0F 63 | } 64 | 65 | if (p1 & ^current & 0x0F) != 0 { 66 | cpu.RequestInterrupt(cpu.InterruptJoypad) 67 | } 68 | 69 | p1 = current 70 | } 71 | -------------------------------------------------------------------------------- /gb/mapper/mapper.go: -------------------------------------------------------------------------------- 1 | package mapper 2 | 3 | // Mapper is the interface to implement MBCs 4 | type Mapper interface { 5 | GetMemoryMap() []uint8 6 | GetROM() []uint8 7 | Setup([]uint8) 8 | Read(uint16) uint8 9 | Write(uint16, uint8) 10 | } 11 | -------------------------------------------------------------------------------- /gb/mbcs/common.go: -------------------------------------------------------------------------------- 1 | package mbcs 2 | 3 | // WriteCommon emulates the internal RAM 0xC000-0xD000 4 | // and the mirror of the internal RAM 0xE000-0xFE00 5 | func WriteCommon(addr uint16, value uint8, mem []uint8) { 6 | switch { 7 | case (addr >= 0xC000) && (addr < 0xDE00): 8 | mem[addr] = value 9 | mem[addr+0x2000] = value 10 | case (addr >= 0xE000) && (addr < 0xFE00): 11 | mem[addr] = value 12 | mem[addr-0x2000] = value 13 | default: 14 | mem[addr] = value 15 | } 16 | } 17 | -------------------------------------------------------------------------------- /gb/mbcs/io.go: -------------------------------------------------------------------------------- 1 | package mbcs 2 | 3 | import ( 4 | "github.com/drhelius/demo-emulator/gb/cpu" 5 | "github.com/drhelius/demo-emulator/gb/input" 6 | "github.com/drhelius/demo-emulator/gb/mapper" 7 | "github.com/drhelius/demo-emulator/gb/util" 8 | "github.com/drhelius/demo-emulator/gb/video" 9 | ) 10 | 11 | // ReadIO returns the values of the special IO registers 12 | func ReadIO(addr uint16, mem []uint8) uint8 { 13 | switch addr { 14 | case 0xFF00: 15 | // P1 16 | return input.Read() 17 | case 0xFF07: 18 | // TAC 19 | return mem[addr] | 0xF8 20 | case 0xFF0F: 21 | // IF 22 | return mem[addr] | 0xE0 23 | case 0xFF41: 24 | // STAT 25 | return mem[addr] | 0x80 26 | case 0xFF44: 27 | // LY 28 | if video.ScreenEnabled { 29 | return mem[0xFF44] 30 | } 31 | return 0x00 32 | case 0xFF4F: 33 | // VBK 34 | return mem[addr] | 0xFE 35 | } 36 | 37 | return mem[addr] 38 | } 39 | 40 | // WriteIO stores the values of the special IO registers 41 | func WriteIO(addr uint16, value uint8, mem []uint8, m mapper.Mapper) { 42 | switch addr { 43 | case 0xFF00: 44 | // P1 45 | input.Write(value) 46 | case 0xFF04: 47 | // DIV 48 | cpu.ResetDivCycles() 49 | mem[addr] = 0x00 50 | case 0xFF07: 51 | // TAC 52 | value &= 0x07 53 | currentTac := mem[addr] 54 | if (currentTac & 0x03) != (value & 0x03) { 55 | cpu.ResetTimaCycles() 56 | mem[0xFF05] = mem[0xFF06] 57 | } 58 | mem[addr] = value 59 | case 0xFF0F: 60 | // IF 61 | mem[addr] = value & 0x1F 62 | case 0xFF40: 63 | // LCDC 64 | currentLcdc := mem[addr] 65 | newLcdc := value 66 | mem[addr] = newLcdc 67 | if !util.IsSetBit(currentLcdc, 5) && util.IsSetBit(newLcdc, 5) { 68 | video.ResetWindowLine() 69 | } 70 | if util.IsSetBit(value, 7) { 71 | video.EnableScreen() 72 | } else { 73 | video.DisableScreen() 74 | } 75 | case 0xFF41: 76 | // STAT 77 | currentStat := mem[addr] & 0x07 78 | newStat := (value & 0x78) | (currentStat & 0x07) 79 | mem[addr] = newStat 80 | lcdc := mem[0xFF40] 81 | if util.IsSetBit(lcdc, 7) { 82 | video.CompareLYToLYC() 83 | } 84 | mem[addr] = value 85 | case 0xFF44: 86 | // LY 87 | currentLy := mem[addr] 88 | if util.IsSetBit(currentLy, 7) && !util.IsSetBit(value, 7) { 89 | video.DisableScreen() 90 | } 91 | mem[addr] = value 92 | case 0xFF45: 93 | // LYC 94 | currentLyc := mem[addr] 95 | if currentLyc != value { 96 | mem[addr] = value 97 | lcdc := mem[0xFF40] 98 | if util.IsSetBit(lcdc, 7) { 99 | video.CompareLYToLYC() 100 | } 101 | } 102 | case 0xFF46: 103 | // DMA 104 | mem[addr] = value 105 | address := uint16(value) << 8 106 | if address >= 0x8000 && address < 0xE000 { 107 | for i := uint16(0x0000); i < 0x00A0; i++ { 108 | m.Write(0xFE00+i, m.Read(address+i)) 109 | } 110 | } 111 | case 0xFFFF: 112 | // IE 113 | mem[addr] = value & 0x1F 114 | default: 115 | mem[addr] = value 116 | } 117 | } 118 | -------------------------------------------------------------------------------- /gb/mbcs/iovalues.go: -------------------------------------------------------------------------------- 1 | package mbcs 2 | 3 | // the initial values observed on a real Game Boy 4 | // for the IO registers 0xFF00-0xFF 5 | var initialValuesForFFXX = [256]uint8{ 6 | 0xCF, 0x00, 0x7E, 0xFF, 0xD3, 0x00, 0x00, 0xF8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE1, 7 | 0x80, 0xBF, 0xF3, 0xFF, 0xBF, 0xFF, 0x3F, 0x00, 0xFF, 0xBF, 0x7F, 0xFF, 0x9F, 0xFF, 0xBF, 0xFF, 8 | 0xFF, 0x00, 0x00, 0xBF, 0x77, 0xF3, 0xF1, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 9 | 0x71, 0x72, 0xD5, 0x91, 0x58, 0xBB, 0x2A, 0xFA, 0xCF, 0x3C, 0x54, 0x75, 0x48, 0xCF, 0x8F, 0xD9, 10 | 0x91, 0x80, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFC, 0xFF, 0xFF, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 11 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 12 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 13 | 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 14 | 0x2B, 0x0B, 0x64, 0x2F, 0xAF, 0x15, 0x60, 0x6D, 0x61, 0x4E, 0xAC, 0x45, 0x0F, 0xDA, 0x92, 0xF3, 15 | 0x83, 0x38, 0xE4, 0x4E, 0xA7, 0x6C, 0x38, 0x58, 0xBE, 0xEA, 0xE5, 0x81, 0xB4, 0xCB, 0xBF, 0x7B, 16 | 0x59, 0xAD, 0x50, 0x13, 0x5E, 0xF6, 0xB3, 0xC1, 0xDC, 0xDF, 0x9E, 0x68, 0xD7, 0x59, 0x26, 0xF3, 17 | 0x62, 0x54, 0xF8, 0x36, 0xB7, 0x78, 0x6A, 0x22, 0xA7, 0xDD, 0x88, 0x15, 0xCA, 0x96, 0x39, 0xD3, 18 | 0xE6, 0x55, 0x6E, 0xEA, 0x90, 0x76, 0xB8, 0xFF, 0x50, 0xCD, 0xB5, 0x1B, 0x1F, 0xA5, 0x4D, 0x2E, 19 | 0xB4, 0x09, 0x47, 0x8A, 0xC4, 0x5A, 0x8C, 0x4E, 0xE7, 0x29, 0x50, 0x88, 0xA8, 0x66, 0x85, 0x4B, 20 | 0xAA, 0x38, 0xE7, 0x6B, 0x45, 0x3E, 0x30, 0x37, 0xBA, 0xC5, 0x31, 0xF2, 0x71, 0xB4, 0xCF, 0x29, 21 | 0xBC, 0x7F, 0x7E, 0xD0, 0xC7, 0xC3, 0xBD, 0xCF, 0x59, 0xEA, 0x39, 0x01, 0x2E, 0x00, 0x69, 0x00} 22 | -------------------------------------------------------------------------------- /gb/mbcs/mbc1.go: -------------------------------------------------------------------------------- 1 | package mbcs 2 | 3 | import "fmt" 4 | 5 | // MBC1 is a mapper implementation to emulate 6 | // cartridges with a MBC1 memory bank controller 7 | type MBC1 struct { 8 | memoryMap []uint8 9 | rom []uint8 10 | ram []uint8 11 | mode uint8 12 | romBank uint 13 | ramBank uint16 14 | ramEnabled bool 15 | romBankHighBits uint 16 | higherROMBank uint 17 | higherRAMBank uint16 18 | ramSize uint8 19 | } 20 | 21 | // GetMemoryMap returns the memory array 22 | func (m *MBC1) GetMemoryMap() []uint8 { 23 | return m.memoryMap 24 | } 25 | 26 | // GetROM returns the rom array 27 | func (m *MBC1) GetROM() []uint8 { 28 | return m.rom 29 | } 30 | 31 | // Setup Receives the rom data and intializes memory 32 | func (m *MBC1) Setup(r []uint8) { 33 | m.rom = r 34 | m.romBank = 1 35 | 36 | m.memoryMap = make([]uint8, 0x10000) 37 | m.ram = make([]uint8, 0x8000) 38 | 39 | for i := 0; i < 0x100; i++ { 40 | m.memoryMap[0xFF00+i] = initialValuesForFFXX[i] 41 | } 42 | 43 | m.ramSize = m.rom[0x149] 44 | ramBanks := 0 45 | 46 | switch m.ramSize { 47 | case 0x00: 48 | ramBanks = 0 49 | m.higherRAMBank = 0x00 50 | case 0x01: 51 | fallthrough 52 | case 0x02: 53 | ramBanks = 1 54 | m.higherRAMBank = 0x00 55 | default: 56 | ramBanks = 4 57 | m.higherRAMBank = 0x03 58 | break 59 | } 60 | 61 | m.higherROMBank = uint(max(pow2Ceil(len(m.rom)/0x4000), 2) - 1) 62 | 63 | fmt.Printf("%d ROM banks\n", m.higherROMBank+1) 64 | fmt.Printf("%d RAM banks\n", ramBanks) 65 | } 66 | 67 | // Read returns the 8 bit value at the 16 bit address of the memory 68 | func (m *MBC1) Read(addr uint16) uint8 { 69 | switch { 70 | case (addr >= 0x0000) && (addr < 0x4000): 71 | // ROM bank 0 72 | return m.rom[addr] 73 | case (addr >= 0x4000) && (addr < 0x8000): 74 | // ROM bank X 75 | return m.rom[(uint(addr)-0x4000)+(m.romBank*0x4000)] 76 | case (addr >= 0xA000) && (addr < 0xC000): 77 | // RAM bank 78 | if m.ramEnabled { 79 | if m.mode == 0 { 80 | return m.ram[addr-0xA000] 81 | } 82 | return m.ram[(addr-0xA000)+(m.ramBank*0x2000)] 83 | } 84 | fmt.Printf("*** attempting to read from disabled RAM %X\n", addr) 85 | return 0xFF 86 | case addr >= 0xFF00: 87 | // IO registers 88 | return ReadIO(addr, m.memoryMap) 89 | } 90 | return m.memoryMap[addr] 91 | } 92 | 93 | // Write stores the 8 bit value at the 16 bit address of the memory 94 | func (m *MBC1) Write(addr uint16, value uint8) { 95 | switch { 96 | case (addr >= 0x0000) && (addr < 0x2000): 97 | // enable / disable RAM 98 | if m.ramSize > 0 { 99 | m.ramEnabled = ((value & 0x0F) == 0x0A) 100 | } 101 | case (addr >= 0x2000) && (addr < 0x4000): 102 | // select ROM bank 103 | if m.mode == 0 { 104 | m.romBank = uint(value&0x1F) | (m.romBankHighBits << 5) 105 | } else { 106 | m.romBank = uint(value & 0x1F) 107 | } 108 | if m.romBank == 0x00 || m.romBank == 0x20 || m.romBank == 0x40 || m.romBank == 0x60 { 109 | m.romBank++ 110 | } 111 | m.romBank &= m.higherROMBank 112 | case (addr >= 0x4000) && (addr < 0x6000): 113 | if m.mode == 1 { 114 | // select RAM bank 115 | m.ramBank = uint16(value & 0x03) 116 | m.ramBank &= m.higherRAMBank 117 | } else { 118 | // select high bits of ROM bank 119 | m.romBankHighBits = uint(value & 0x03) 120 | m.romBank = (m.romBank & 0x1F) | (m.romBankHighBits << 5) 121 | if m.romBank == 0x00 || m.romBank == 0x20 || m.romBank == 0x40 || m.romBank == 0x60 { 122 | m.romBank++ 123 | } 124 | m.romBank &= m.higherROMBank 125 | } 126 | case (addr >= 0x6000) && (addr < 0x8000): 127 | // operation mode 128 | if (m.ramSize != 3) && ((value & 0x01) != 0) { 129 | fmt.Printf("*** attempting to change MBC1 to mode 1 with incorrect RAM banks %X %X\n", addr, value) 130 | } else { 131 | m.mode = value & 0x01 132 | } 133 | case (addr >= 0xA000) && (addr < 0xC000): 134 | // cartridge RAM 135 | if m.ramEnabled { 136 | if m.mode == 0 { 137 | m.ram[addr-0xA000] = value 138 | } else { 139 | m.ram[(addr-0xA000)+(m.ramBank*0x2000)] = value 140 | } 141 | } else { 142 | fmt.Printf("*** attempting to write to disabled RAM %X %X\n", addr, value) 143 | } 144 | case (addr >= 0xC000) && (addr < 0xFE00): 145 | // internal RAM 146 | WriteCommon(addr, value, m.memoryMap) 147 | case addr >= 0xFF00: 148 | // IO registers 149 | WriteIO(addr, value, m.memoryMap, m) 150 | default: 151 | m.memoryMap[addr] = value 152 | } 153 | } 154 | 155 | func max(a, b int) int { 156 | if a < b { 157 | return b 158 | } 159 | return a 160 | } 161 | 162 | func pow2Ceil(n int) int { 163 | n-- 164 | n |= n >> 1 165 | n |= n >> 2 166 | n |= n >> 4 167 | n |= n >> 8 168 | n++ 169 | return n 170 | } 171 | -------------------------------------------------------------------------------- /gb/mbcs/romonly.go: -------------------------------------------------------------------------------- 1 | package mbcs 2 | 3 | import "fmt" 4 | 5 | // RomOnly is a mapper implementation to emulate 6 | // cartridges with only a ROM chip 7 | type RomOnly struct { 8 | memoryMap []uint8 9 | rom []uint8 10 | } 11 | 12 | // GetMemoryMap returns the memory array 13 | func (m *RomOnly) GetMemoryMap() []uint8 { 14 | return m.memoryMap 15 | } 16 | 17 | // GetROM returns the rom array 18 | func (m *RomOnly) GetROM() []uint8 { 19 | return m.rom 20 | } 21 | 22 | // Setup Receives the rom data and intializes memory 23 | func (m *RomOnly) Setup(r []uint8) { 24 | m.rom = r 25 | m.memoryMap = make([]uint8, 0x10000) 26 | 27 | for i := 0; i < 0x100; i++ { 28 | m.memoryMap[0xFF00+i] = initialValuesForFFXX[i] 29 | } 30 | } 31 | 32 | // Read returns the 8 bit value at the 16 bit address of the memory 33 | func (m *RomOnly) Read(addr uint16) uint8 { 34 | switch { 35 | case addr < 0x8000: 36 | // ROM 37 | return m.rom[addr] 38 | case addr >= 0xFF00: 39 | // IO Registers 40 | return ReadIO(addr, m.memoryMap) 41 | } 42 | return m.memoryMap[addr] 43 | } 44 | 45 | // Write stores the 8 bit value at the 16 bit address of the memory 46 | func (m *RomOnly) Write(addr uint16, value uint8) { 47 | switch { 48 | case addr < 0x8000: 49 | // ROM 50 | fmt.Printf("*** attempting to write on ROM address %X %X\n", addr, value) 51 | case (addr >= 0xC000) && (addr < 0xFE00): 52 | // Internal RAM 53 | WriteCommon(addr, value, m.memoryMap) 54 | case addr >= 0xFF00: 55 | // IO Registers 56 | WriteIO(addr, value, m.memoryMap, m) 57 | default: 58 | m.memoryMap[addr] = value 59 | } 60 | } 61 | -------------------------------------------------------------------------------- /gb/util/constants.go: -------------------------------------------------------------------------------- 1 | package util 2 | 3 | // GbWidth is the original Game Boy LCD Width in pixels 4 | const GbWidth = 160 5 | 6 | // GbHeight is the original Game Boy LCD Height in pixels 7 | const GbHeight = 144 8 | -------------------------------------------------------------------------------- /gb/util/functions.go: -------------------------------------------------------------------------------- 1 | package util 2 | 3 | // SetBit sets the selected bit to 1 inside a byte and returns the new byte 4 | func SetBit(value uint8, bit uint8) uint8 { 5 | return value | (0x01 << bit) 6 | } 7 | 8 | // UnsetBit clears the selected bit to 0 inside a byte and returns the new byte 9 | func UnsetBit(value uint8, bit uint8) uint8 { 10 | return value & (^(0x01 << bit)) 11 | } 12 | 13 | // IsSetBit returns true if the selected bit inside a byte is 1 14 | func IsSetBit(value uint8, bit uint8) bool { 15 | return (value & (0x01 << bit)) != 0 16 | } 17 | -------------------------------------------------------------------------------- /gb/util/types.go: -------------------------------------------------------------------------------- 1 | package util 2 | 3 | // GameboyButton is the type representing the buttons of the Game Boy 4 | type GameboyButton int 5 | 6 | // These are all the buttons on the Game Boy 7 | const ( 8 | AButton GameboyButton = 4 9 | BButton GameboyButton = 5 10 | StartButton GameboyButton = 7 11 | SelectButton GameboyButton = 6 12 | RightButton GameboyButton = 0 13 | LeftButton GameboyButton = 1 14 | UpButton GameboyButton = 2 15 | DownButton GameboyButton = 3 16 | ) 17 | -------------------------------------------------------------------------------- /gb/video/background.go: -------------------------------------------------------------------------------- 1 | package video 2 | 3 | import "github.com/drhelius/demo-emulator/gb/util" 4 | 5 | func renderBG(line uint8) { 6 | lcdc := mem.GetMemoryMap()[0xFF40] 7 | lineWidth := uint(line) * uint(util.GbWidth) 8 | 9 | if util.IsSetBit(lcdc, 0) { 10 | var tiles uint = 0x8800 11 | if util.IsSetBit(lcdc, 4) { 12 | tiles = 0x8000 13 | } 14 | var maploc uint = 0x9800 15 | if util.IsSetBit(lcdc, 3) { 16 | maploc = 0x9C00 17 | } 18 | 19 | scx := mem.GetMemoryMap()[0xFF43] 20 | scy := mem.GetMemoryMap()[0xFF42] 21 | lineAdjusted := line + scy 22 | y32 := (uint(lineAdjusted) / 8) * 32 23 | pixely := uint(lineAdjusted) % 8 24 | pixely2 := pixely * 2 25 | 26 | var x uint 27 | for ; x < 32; x++ { 28 | var tile uint8 29 | 30 | if tiles == 0x8800 { 31 | tile = uint8(int(int8(mem.GetMemoryMap()[maploc+y32+x])) + 128) 32 | } else { 33 | tile = mem.Read(uint16(maploc + y32 + x)) 34 | } 35 | 36 | mapOffsetX := x * 8 37 | tile16 := uint(tile) * 16 38 | tileAddress := tiles + tile16 + pixely2 39 | 40 | byte1 := mem.Read(uint16(tileAddress)) 41 | byte2 := mem.Read(uint16(tileAddress) + 1) 42 | 43 | var pixelx uint8 44 | for ; pixelx < 8; pixelx++ { 45 | bufferX := uint8(mapOffsetX) + pixelx - scx 46 | 47 | if bufferX >= util.GbWidth { 48 | continue 49 | } 50 | var pixel uint8 51 | if (byte1 & (0x1 << (7 - pixelx))) != 0 { 52 | pixel = 1 53 | } 54 | if (byte2 & (0x1 << (7 - pixelx))) != 0 { 55 | pixel |= 2 56 | } 57 | 58 | position := lineWidth + uint(bufferX) 59 | 60 | colorCacheBuffer[position] = pixel & 0x03 61 | 62 | palette := mem.GetMemoryMap()[0xFF47] 63 | color := (palette >> (pixel * 2)) & 0x03 64 | GbFrameBuffer[position] = color 65 | } 66 | } 67 | } else { 68 | var x uint 69 | for ; x < util.GbWidth; x++ { 70 | position := lineWidth + x 71 | GbFrameBuffer[position] = 0 72 | colorCacheBuffer[position] = 0 73 | } 74 | } 75 | } 76 | -------------------------------------------------------------------------------- /gb/video/sprites.go: -------------------------------------------------------------------------------- 1 | package video 2 | 3 | import "github.com/drhelius/demo-emulator/gb/util" 4 | 5 | var ( 6 | spriteCacheBuffer [util.GbWidth * util.GbHeight]int 7 | ) 8 | 9 | func renderSprites(line uint8) { 10 | 11 | lcdc := mem.GetMemoryMap()[0xFF40] 12 | 13 | if !util.IsSetBit(lcdc, 1) { 14 | return 15 | } 16 | 17 | spriteHeight := 8 18 | var spriteHeightMask uint8 = 0xFF 19 | if util.IsSetBit(lcdc, 2) { 20 | spriteHeight = 16 21 | spriteHeightMask = 0xFE 22 | } 23 | 24 | lineWidth := int(line) * util.GbWidth 25 | 26 | sprite := 39 27 | for ; sprite >= 0; sprite-- { 28 | sprite4 := sprite * 4 29 | spriteY := int(mem.GetMemoryMap()[0xFE00+sprite4]) - 16 30 | 31 | if (spriteY > int(line)) || ((spriteY + spriteHeight) <= int(line)) { 32 | continue 33 | } 34 | 35 | spriteX := int(mem.GetMemoryMap()[0xFE00+sprite4+1]) - 8 36 | 37 | if (spriteX < -7) || (spriteX >= util.GbWidth) { 38 | continue 39 | } 40 | 41 | spriteTile16 := int(mem.GetMemoryMap()[0xFE00+sprite4+2]&spriteHeightMask) * 16 42 | spriteFlags := mem.GetMemoryMap()[0xFE00+sprite4+3] 43 | 44 | spritePallete := util.IsSetBit(spriteFlags, 4) 45 | xflip := util.IsSetBit(spriteFlags, 5) 46 | yflip := util.IsSetBit(spriteFlags, 6) 47 | aboveBG := !util.IsSetBit(spriteFlags, 7) 48 | 49 | tiles := 0x8000 50 | pixelY := int(line) - spriteY 51 | if yflip { 52 | pixelY = (spriteHeight - 1) - (int(line) - spriteY) 53 | } 54 | 55 | pixelY2 := 0 56 | offset := 0 57 | 58 | if (spriteHeight == 16) && (pixelY >= 8) { 59 | pixelY2 = (pixelY - 8) * 2 60 | offset = 16 61 | } else { 62 | pixelY2 = pixelY * 2 63 | } 64 | 65 | tileAddress := tiles + spriteTile16 + pixelY2 + offset 66 | 67 | byte1 := mem.GetMemoryMap()[tileAddress] 68 | byte2 := mem.GetMemoryMap()[tileAddress+1] 69 | 70 | var pixelx int 71 | for ; pixelx < 8; pixelx++ { 72 | 73 | var pixelxFlipped = 7 - uint(pixelx) 74 | if xflip { 75 | pixelxFlipped = uint(pixelx) 76 | } 77 | 78 | var pixel uint8 79 | 80 | if (byte1 & (0x01 << pixelxFlipped)) != 0 { 81 | pixel = 0x01 82 | } 83 | if (byte2 & (0x01 << pixelxFlipped)) != 0 { 84 | pixel |= 0x02 85 | } 86 | 87 | if pixel == 0 { 88 | continue 89 | } 90 | 91 | bufferX := spriteX + pixelx 92 | 93 | if (bufferX < 0) || (bufferX >= util.GbWidth) { 94 | continue 95 | } 96 | 97 | position := lineWidth + bufferX 98 | 99 | colorCache := colorCacheBuffer[position] 100 | 101 | spriteCache := spriteCacheBuffer[position] 102 | if util.IsSetBit(colorCache, 3) && (spriteCache < spriteX) { 103 | continue 104 | } 105 | 106 | if !aboveBG && ((colorCache & 0x03) != 0) { 107 | continue 108 | } 109 | 110 | colorCacheBuffer[position] = util.SetBit(colorCache, 3) 111 | spriteCacheBuffer[position] = spriteX 112 | 113 | var paletteAddr uint16 = 0xFF48 114 | if spritePallete { 115 | paletteAddr = 0xFF49 116 | } 117 | 118 | palette := mem.GetMemoryMap()[paletteAddr] 119 | color := (palette >> (pixel * 2)) & 0x03 120 | GbFrameBuffer[position] = color 121 | } 122 | } 123 | } 124 | -------------------------------------------------------------------------------- /gb/video/video.go: -------------------------------------------------------------------------------- 1 | package video 2 | 3 | import ( 4 | "github.com/drhelius/demo-emulator/gb/cpu" 5 | "github.com/drhelius/demo-emulator/gb/mapper" 6 | "github.com/drhelius/demo-emulator/gb/util" 7 | ) 8 | 9 | var ( 10 | // GbFrameBuffer is the internal Game Boy frame buffer 11 | GbFrameBuffer [util.GbWidth * util.GbHeight]uint8 12 | // ScreenEnabled keeps track of the screen state 13 | ScreenEnabled bool 14 | statusMode uint8 15 | statusModeCycles uint 16 | subStatusModeCycles uint 17 | lyCounter uint8 18 | vblankLine uint8 19 | mem mapper.Mapper 20 | colorCacheBuffer [util.GbWidth * util.GbHeight]uint8 21 | ) 22 | 23 | func init() { 24 | // the Game Boy starts on V-BLANK 25 | statusMode = 1 26 | lyCounter = 144 27 | ScreenEnabled = true 28 | } 29 | 30 | // SetMapper injects the memory impl 31 | func SetMapper(m mapper.Mapper) { 32 | mem = m 33 | } 34 | 35 | // Tick runs the video eumulation n cycles 36 | // Then updates the frameBuffer and returns true if the simulation reached the vblank 37 | func Tick(cycles uint) bool { 38 | vblank := false 39 | statusModeCycles += cycles 40 | 41 | if ScreenEnabled { 42 | switch statusMode { 43 | // During H-BLANK 44 | case 0: 45 | if statusModeCycles >= 204 { 46 | statusModeCycles -= 204 47 | statusMode = 2 48 | lyCounter++ 49 | mem.GetMemoryMap()[0xFF44] = lyCounter 50 | CompareLYToLYC() 51 | 52 | // if last visible line, change to vblank 53 | if lyCounter == 144 { 54 | statusMode = 1 55 | vblankLine = 0 56 | subStatusModeCycles = statusModeCycles 57 | cpu.RequestInterrupt(cpu.InterruptVBlank) 58 | stat := mem.GetMemoryMap()[0xFF41] 59 | if util.IsSetBit(stat, 4) { 60 | cpu.RequestInterrupt(cpu.InterruptLCDSTAT) 61 | } 62 | vblank = true 63 | windowLine = 0 64 | } else { 65 | stat := mem.GetMemoryMap()[0xFF41] 66 | if util.IsSetBit(stat, 5) { 67 | cpu.RequestInterrupt(cpu.InterruptLCDSTAT) 68 | } 69 | } 70 | 71 | updateStatRegister() 72 | } 73 | // During V-BLANK 74 | case 1: 75 | subStatusModeCycles += cycles 76 | 77 | // advance a line each 456 cycles 78 | if subStatusModeCycles >= 456 { 79 | subStatusModeCycles -= 456 80 | vblankLine++ 81 | 82 | if vblankLine <= 9 { 83 | lyCounter++ 84 | mem.GetMemoryMap()[0xFF44] = lyCounter 85 | CompareLYToLYC() 86 | } 87 | } 88 | 89 | // line 0 starts one line before the end of V-BLANK 90 | if (statusModeCycles >= 4104) && (subStatusModeCycles >= 4) && (lyCounter == 153) { 91 | lyCounter = 0 92 | mem.GetMemoryMap()[0xFF44] = lyCounter 93 | CompareLYToLYC() 94 | } 95 | 96 | // end of V-BLANK 97 | if statusModeCycles >= 4560 { 98 | statusModeCycles -= 4560 99 | statusMode = 2 100 | updateStatRegister() 101 | stat := mem.GetMemoryMap()[0xFF41] 102 | if util.IsSetBit(stat, 5) { 103 | cpu.RequestInterrupt(cpu.InterruptLCDSTAT) 104 | } 105 | } 106 | // During searching OAM RAM 107 | case 2: 108 | if statusModeCycles >= 80 { 109 | statusModeCycles -= 80 110 | statusMode = 3 111 | updateStatRegister() 112 | } 113 | // During transfering data to LCD driver 114 | case 3: 115 | if statusModeCycles >= 172 { 116 | statusModeCycles -= 172 117 | statusMode = 0 118 | scanLine(lyCounter) 119 | updateStatRegister() 120 | stat := mem.GetMemoryMap()[0xFF41] 121 | if util.IsSetBit(stat, 3) { 122 | cpu.RequestInterrupt(cpu.InterruptLCDSTAT) 123 | } 124 | } 125 | } 126 | // if ScreenEnabled == false 127 | } else { 128 | // force a vblank each frame even if 129 | // the screen is disabled 130 | if statusModeCycles >= 70224 { 131 | statusModeCycles -= 70224 132 | vblank = true 133 | } 134 | } 135 | 136 | return vblank 137 | } 138 | 139 | // EnableScreen enables the screen 140 | func EnableScreen() { 141 | if !ScreenEnabled { 142 | ScreenEnabled = true 143 | statusMode = 0 144 | statusModeCycles = 0 145 | subStatusModeCycles = 0 146 | lyCounter = 0 147 | vblankLine = 0 148 | windowLine = 0 149 | 150 | mem.GetMemoryMap()[0xFF44] = lyCounter 151 | 152 | stat := mem.GetMemoryMap()[0xFF41] 153 | if util.IsSetBit(stat, 5) { 154 | cpu.RequestInterrupt(cpu.InterruptLCDSTAT) 155 | } 156 | 157 | CompareLYToLYC() 158 | } 159 | } 160 | 161 | // DisableScreen disables the screen 162 | func DisableScreen() { 163 | ScreenEnabled = false 164 | mem.GetMemoryMap()[0xFF44] = 0x00 165 | stat := mem.GetMemoryMap()[0xFF41] 166 | stat &= 0x7C 167 | mem.GetMemoryMap()[0xFF41] = stat 168 | statusMode = 0 169 | statusModeCycles = 0 170 | subStatusModeCycles = 0 171 | lyCounter = 0 172 | } 173 | 174 | // CompareLYToLYC compares LY counter with LYC register 175 | func CompareLYToLYC() { 176 | if ScreenEnabled { 177 | lyc := mem.GetMemoryMap()[0xFF45] 178 | stat := mem.GetMemoryMap()[0xFF41] 179 | 180 | if lyc == lyCounter { 181 | stat = util.SetBit(stat, 2) 182 | if util.IsSetBit(stat, 6) { 183 | cpu.RequestInterrupt(cpu.InterruptLCDSTAT) 184 | } 185 | } else { 186 | stat = util.UnsetBit(stat, 2) 187 | } 188 | 189 | mem.GetMemoryMap()[0xFF41] = stat 190 | } 191 | } 192 | 193 | func scanLine(line uint8) { 194 | lcdc := mem.GetMemoryMap()[0xFF40] 195 | 196 | if ScreenEnabled && util.IsSetBit(lcdc, 7) { 197 | renderBG(line) 198 | renderWindow(line) 199 | renderSprites(line) 200 | } else { 201 | var x uint8 202 | for ; x < util.GbWidth; x++ { 203 | GbFrameBuffer[(line*util.GbWidth)+x] = 0 204 | } 205 | } 206 | } 207 | 208 | func updateStatRegister() { 209 | // Updates the STAT register with current mode 210 | stat := mem.GetMemoryMap()[0xFF41] 211 | mem.GetMemoryMap()[0xFF41] = (stat & 0xFC) | (statusMode & 0x3) 212 | } 213 | -------------------------------------------------------------------------------- /gb/video/window.go: -------------------------------------------------------------------------------- 1 | package video 2 | 3 | import "github.com/drhelius/demo-emulator/gb/util" 4 | 5 | var ( 6 | windowLine uint 7 | ) 8 | 9 | // ResetWindowLine resetes the current line of the window 10 | func ResetWindowLine() { 11 | wy := mem.GetMemoryMap()[0xFF4A] 12 | 13 | if (windowLine == 0) && (lyCounter < 144) && (lyCounter > wy) { 14 | windowLine = 144 15 | } 16 | } 17 | 18 | func renderWindow(line uint8) { 19 | if windowLine > 143 { 20 | return 21 | } 22 | 23 | lcdc := mem.GetMemoryMap()[0xFF40] 24 | if !util.IsSetBit(lcdc, 5) { 25 | return 26 | } 27 | 28 | wx := int(mem.GetMemoryMap()[0xFF4B]) - 7 29 | if wx > 159 { 30 | return 31 | } 32 | 33 | wy := mem.GetMemoryMap()[0xFF4A] 34 | if (wy > 143) || (wy > line) { 35 | return 36 | } 37 | 38 | var tilesAddr uint = 0x8800 39 | if util.IsSetBit(lcdc, 4) { 40 | tilesAddr = 0x8000 41 | } 42 | var mapAddr uint = 0x9800 43 | if util.IsSetBit(lcdc, 6) { 44 | mapAddr = 0x9C00 45 | } 46 | 47 | lineAdjusted := windowLine 48 | y32 := (lineAdjusted / 8) * 32 49 | pixely := lineAdjusted % 8 50 | pixely2 := pixely * 2 51 | lineWidth := uint(line) * util.GbWidth 52 | 53 | var x uint 54 | for ; x < 32; x++ { 55 | var tile int 56 | 57 | if tilesAddr == 0x8800 { 58 | tile = int(int8(mem.GetMemoryMap()[mapAddr+y32+x])) 59 | tile += 128 60 | } else { 61 | tile = int(mem.GetMemoryMap()[mapAddr+y32+x]) 62 | } 63 | 64 | mapOffsetX := x * 8 65 | tile16 := uint(tile) * 16 66 | tileAddress := tilesAddr + tile16 + pixely2 67 | 68 | byte1 := mem.GetMemoryMap()[tileAddress] 69 | byte2 := mem.GetMemoryMap()[tileAddress+1] 70 | 71 | var pixelx uint8 72 | for ; pixelx < 8; pixelx++ { 73 | bufferX := (int(mapOffsetX) + int(pixelx) + wx) 74 | 75 | if (bufferX < 0) || (bufferX >= util.GbWidth) { 76 | continue 77 | } 78 | 79 | var pixel uint8 80 | if (byte1 & (0x1 << (7 - pixelx))) != 0 { 81 | pixel = 1 82 | } 83 | if (byte2 & (0x1 << (7 - pixelx))) != 0 { 84 | pixel |= 2 85 | } 86 | 87 | position := lineWidth + uint(bufferX) 88 | colorCacheBuffer[position] = pixel & 0x03 89 | 90 | palette := mem.GetMemoryMap()[0xFF47] 91 | color := (palette >> (pixel * 2)) & 0x03 92 | GbFrameBuffer[position] = color 93 | 94 | } 95 | } 96 | windowLine++ 97 | } 98 | -------------------------------------------------------------------------------- /glfw/glfw.go: -------------------------------------------------------------------------------- 1 | package glfw 2 | 3 | import ( 4 | "fmt" 5 | "log" 6 | "runtime" 7 | 8 | "github.com/drhelius/demo-emulator/gb/core" 9 | "github.com/drhelius/demo-emulator/gb/util" 10 | "github.com/go-gl/glfw/v3.2/glfw" 11 | ) 12 | 13 | // multiplier to control the size of the Window 14 | // Width = GbWidth * zoom, Height = GbHeight * zoom 15 | const zoom = 5 16 | 17 | var window *glfw.Window 18 | 19 | func init() { 20 | // GLFW event handling must run on the main OS thread 21 | runtime.LockOSThread() 22 | } 23 | 24 | // Setup initializes the windowing system 25 | func Setup() { 26 | if err := glfw.Init(); err != nil { 27 | log.Fatalln("failed to initialize glfw:", err) 28 | } 29 | 30 | fmt.Println("glfw init ok") 31 | 32 | // fixed size window 33 | glfw.WindowHint(glfw.Resizable, glfw.False) 34 | 35 | // sets the OpenGL version to 2.1 36 | glfw.WindowHint(glfw.ContextVersionMajor, 2) 37 | glfw.WindowHint(glfw.ContextVersionMinor, 1) 38 | 39 | var err error 40 | window, err = glfw.CreateWindow(util.GbWidth*zoom, util.GbHeight*zoom, "Hack & Sangria - GB Emu", nil, nil) 41 | if err != nil { 42 | panic(err) 43 | } 44 | 45 | // sets the callback to receive input events 46 | window.SetKeyCallback(onKey) 47 | 48 | // move the rendering context to this thread 49 | window.MakeContextCurrent() 50 | 51 | // enable vsync, forces 60fps on most displays 52 | glfw.SwapInterval(1) 53 | 54 | fmt.Println("window ok") 55 | } 56 | 57 | // Update swaps the buffers and updates the input 58 | func Update() { 59 | window.SwapBuffers() 60 | glfw.PollEvents() 61 | } 62 | 63 | // WindowClosed checks if the window has been closed by the user 64 | func WindowClosed() bool { 65 | return window.ShouldClose() 66 | } 67 | 68 | // Teardown shut downs the windowing system 69 | func Teardown() { 70 | glfw.Terminate() 71 | } 72 | 73 | func onKey(window *glfw.Window, k glfw.Key, s int, action glfw.Action, mods glfw.ModifierKey) { 74 | 75 | // check for key press / release events 76 | // and notifiy the emulator accordingly 77 | 78 | switch glfw.Key(k) { 79 | case glfw.KeyEnter: 80 | if action == glfw.Press { 81 | core.ButtonPressed(util.StartButton) 82 | } else if action == glfw.Release { 83 | core.ButtonReleased(util.StartButton) 84 | } 85 | case glfw.KeySpace: 86 | if action == glfw.Press { 87 | core.ButtonPressed(util.SelectButton) 88 | } else if action == glfw.Release { 89 | core.ButtonReleased(util.SelectButton) 90 | } 91 | case glfw.KeyS: 92 | if action == glfw.Press { 93 | core.ButtonPressed(util.AButton) 94 | } else if action == glfw.Release { 95 | core.ButtonReleased(util.AButton) 96 | } 97 | case glfw.KeyA: 98 | if action == glfw.Press { 99 | core.ButtonPressed(util.BButton) 100 | } else if action == glfw.Release { 101 | core.ButtonReleased(util.BButton) 102 | } 103 | case glfw.KeyUp: 104 | if action == glfw.Press { 105 | core.ButtonPressed(util.UpButton) 106 | } else if action == glfw.Release { 107 | core.ButtonReleased(util.UpButton) 108 | } 109 | case glfw.KeyDown: 110 | if action == glfw.Press { 111 | core.ButtonPressed(util.DownButton) 112 | } else if action == glfw.Release { 113 | core.ButtonReleased(util.DownButton) 114 | } 115 | case glfw.KeyLeft: 116 | if action == glfw.Press { 117 | core.ButtonPressed(util.LeftButton) 118 | } else if action == glfw.Release { 119 | core.ButtonReleased(util.LeftButton) 120 | } 121 | case glfw.KeyRight: 122 | if action == glfw.Press { 123 | core.ButtonPressed(util.RightButton) 124 | } else if action == glfw.Release { 125 | core.ButtonReleased(util.RightButton) 126 | } 127 | default: 128 | return 129 | } 130 | } 131 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "flag" 5 | "fmt" 6 | 7 | "github.com/drhelius/demo-emulator/gb/core" 8 | "github.com/drhelius/demo-emulator/gb/util" 9 | "github.com/drhelius/demo-emulator/glfw" 10 | "github.com/drhelius/demo-emulator/opengl" 11 | ) 12 | 13 | var colorFrameBuffer [util.GbWidth * util.GbHeight * 4]uint8 14 | 15 | func main() { 16 | // init windowing system 17 | glfw.Setup() 18 | 19 | // init rendering system 20 | opengl.Setup(colorFrameBuffer[:]) 21 | 22 | loadROM() 23 | 24 | loop() 25 | 26 | opengl.Teardown() 27 | glfw.Teardown() 28 | } 29 | 30 | func loadROM() { 31 | // get the rom path from a command line argument 32 | romPathPtr := flag.String("rom", "", "rom path") 33 | flag.Parse() 34 | 35 | // tell the emulator to load the rom from a path 36 | core.LoadROM(*romPathPtr) 37 | } 38 | 39 | func loop() { 40 | fmt.Println("starting loop...") 41 | 42 | // while the user doesn't close the window 43 | for !glfw.WindowClosed() { 44 | 45 | // run the emulation one frame 46 | // it should be called 60 times in a second 47 | core.RunToVBlank(colorFrameBuffer[:]) 48 | 49 | // render de results 50 | opengl.Render() 51 | 52 | // present the rendering in a window 53 | // and update input 54 | glfw.Update() 55 | } 56 | } 57 | -------------------------------------------------------------------------------- /opengl/opengl.go: -------------------------------------------------------------------------------- 1 | package opengl 2 | 3 | import ( 4 | "fmt" 5 | 6 | "github.com/drhelius/demo-emulator/gb/util" 7 | "github.com/go-gl/gl/v2.1/gl" 8 | ) 9 | 10 | var ( 11 | texture uint32 12 | colorFrameBuffer []uint8 13 | ) 14 | 15 | // Setup initializes OpenGL 16 | func Setup(fb []uint8) { 17 | 18 | // a reference to the array of pixels generated by the 19 | // emulator that will be presented on the screen 20 | colorFrameBuffer = fb 21 | 22 | if err := gl.Init(); err != nil { 23 | panic(err) 24 | } 25 | 26 | fmt.Println("gl init ok") 27 | 28 | // enable textures and create one texture to dump the contents 29 | // of the emulator frame buffer 30 | // this texture has the same size as the Game Boy screen 31 | gl.Enable(gl.TEXTURE_2D) 32 | gl.GenTextures(1, &texture) 33 | gl.BindTexture(gl.TEXTURE_2D, texture) 34 | gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, util.GbWidth, util.GbHeight, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(&colorFrameBuffer[0])) 35 | 36 | fmt.Println("gl setup ok") 37 | } 38 | 39 | // Render draws the current frame 40 | func Render() { 41 | 42 | // bind the texture we create before and transfer 43 | // the contents of the emulator frame buffer to it 44 | // this way the texture will store the updated pixels 45 | // of the frame buffer 46 | gl.BindTexture(gl.TEXTURE_2D, texture) 47 | gl.TexSubImage2D(gl.TEXTURE_2D, 0, 0, 0, util.GbWidth, util.GbHeight, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(&colorFrameBuffer[0])) 48 | 49 | // disable any filtering to avoid bluring the texture 50 | gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST) 51 | gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST) 52 | 53 | // set an orthogonal projection (2D) with the size of 54 | // the Game Boy Screen 55 | gl.MatrixMode(gl.PROJECTION) 56 | gl.LoadIdentity() 57 | gl.Ortho(0.0, util.GbWidth, 0.0, util.GbHeight, -1.0, 1.0) 58 | gl.MatrixMode(gl.MODELVIEW) 59 | 60 | // render a single quad with the size of the Game Boy 61 | // screen and with the contents of the emulator 62 | // frame buffer (already in the texture) 63 | gl.Begin(gl.QUADS) 64 | gl.TexCoord2d(0.0, 1.0) 65 | gl.Vertex2d(0.0, 0.0) 66 | gl.TexCoord2d(1.0, 1.0) 67 | gl.Vertex2d(util.GbWidth, 0.0) 68 | gl.TexCoord2d(1.0, 0.0) 69 | gl.Vertex2d(util.GbWidth, util.GbHeight) 70 | gl.TexCoord2d(0.0, 0.0) 71 | gl.Vertex2d(0.0, util.GbHeight) 72 | gl.End() 73 | } 74 | 75 | // Teardown shut downs OpenGL 76 | func Teardown() { 77 | gl.DeleteTextures(1, &texture) 78 | } 79 | -------------------------------------------------------------------------------- /screenshots/screenshot1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/screenshots/screenshot1.png -------------------------------------------------------------------------------- /screenshots/screenshot2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/screenshots/screenshot2.png -------------------------------------------------------------------------------- /slides/Golang Emus.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/slides/Golang Emus.pdf -------------------------------------------------------------------------------- /test_roms/cpu_instrs/cpu_instrs.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/cpu_instrs.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/01-special.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/01-special.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/02-interrupts.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/02-interrupts.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/03-op sp,hl.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/03-op sp,hl.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/04-op r,imm.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/04-op r,imm.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/05-op rp.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/05-op rp.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/06-ld r,r.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/06-ld r,r.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/07-jr,jp,call,ret,rst.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/07-jr,jp,call,ret,rst.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/08-misc instrs.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/08-misc instrs.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/09-op r,r.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/09-op r,r.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/10-bit ops.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/10-bit ops.gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/individual/11-op a,(hl).gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/cpu_instrs/individual/11-op a,(hl).gb -------------------------------------------------------------------------------- /test_roms/cpu_instrs/readme.txt: -------------------------------------------------------------------------------- 1 | Game Boy CPU Instruction Behavior Test 2 | -------------------------------------- 3 | This ROM tests the behavior of all CPU instructions except STOP and the 4 | 11 illegal opcodes. The tests are fairly thorough, running instructions 5 | with boundary data and verifying both the result and that other 6 | registers are not modified. Instructions which perform the same 7 | operation on different registers are each tested just as thoroughly, in 8 | case an emulator implements each independently. Some sub-tests take half 9 | minute to complete. 10 | 11 | Failed instructions are listed as 12 | 13 | [CB] opcode 14 | 15 | Some errors cannot of course be diagnosed properly, since the test 16 | framework itself relies on basic instruction behavior being correct. 17 | 18 | 19 | Internal operation 20 | ------------------ 21 | The main tests use a framework that runs each instruction in a loop, 22 | varying the register values on input and examining them on output. 23 | Rather than keep a table of correct values, it simply calculates a 24 | CRC-32 checksum of all the output, then compares this with the correct 25 | value. Instructions are divided into several groups, each with a 26 | different set of input values suited for their behavior; for example, 27 | the bit test instructions are fed $01, $02, $04 ... $40, $80, to ensure 28 | each bit is handled properly, while the arithmetic instructions are fed 29 | $01, $0F, $10, $7F, $FF, to exercise carry and half-carry. A few 30 | instructions require a custom test due to their uniqueness. 31 | 32 | 33 | Multi-ROM 34 | --------- 35 | In the main directory is a single ROM which runs all the tests. It 36 | prints a test's number, runs the test, then "ok" if it passes, otherwise 37 | a failure code. Once all tests have completed it either reports that all 38 | tests passed, or prints the number of failed tests. Finally, it makes 39 | several beeps. If a test fails, it can be run on its own by finding the 40 | corresponding ROM in individual/. 41 | 42 | Ths compact format on screen is to avoid having the results scroll off 43 | the top, so the test can be started and allowed to run without having to 44 | constantly monitor the display. 45 | 46 | Currently there is no well-defined way for an emulator test rig to 47 | programatically find the result of the test; contact me if you're trying 48 | to do completely automated testing of your emulator. One simple approach 49 | is to take a screenshot after all tests have run, or even just a 50 | checksum of one, and compare this with a previous run. 51 | 52 | 53 | Failure codes 54 | ------------- 55 | Failed tests may print a failure code, and also short description of the 56 | problem. For more information about a failure code, look in the 57 | corresponding source file in source/; the point in the code where 58 | "set_test n" occurs is where that failure code will be generated. 59 | Failure code 1 is a general failure of the test; any further information 60 | will be printed. 61 | 62 | Note that once a sub-test fails, no further tests for that file are run. 63 | 64 | 65 | Console output 66 | -------------- 67 | Information is printed on screen in a way that needs only minimum LCD 68 | support, and won't hang if LCD output isn't supported at all. 69 | Specifically, while polling LY to wait for vblank, it will time out if 70 | it takes too long, so LY always reading back as the same value won't 71 | hang the test. It's also OK if scrolling isn't supported; in this case, 72 | text will appear starting at the top of the screen. 73 | 74 | Everything printed on screen is also sent to the game link port by 75 | writing the character to SB, then writing $81 to SC. This is useful for 76 | tests which print lots of information that scrolls off screen. 77 | 78 | 79 | Source code 80 | ----------- 81 | Source code is included for all tests, in source/. It can be used to 82 | build the individual test ROMs. Code for the multi test isn't included 83 | due to the complexity of putting everything together. 84 | 85 | Code is written for the wla-dx assembler. To assemble a particular test, 86 | execute 87 | 88 | wla -o "source_filename.s" test.o 89 | wlalink linkfile test.gb 90 | 91 | Test code uses a common shell framework contained in common/. 92 | 93 | 94 | Internal framework operation 95 | ---------------------------- 96 | Tests use a common framework for setting things up, reporting results, 97 | and ending. All files first include "shell.inc", which sets up the ROM 98 | header and shell code, and includes other commonly-used modules. 99 | 100 | One oddity is that test code is first copied to internal RAM at $D000, 101 | then executed there. This allows self-modification, and ensures the code 102 | is executed the same way it is on my devcart, which doesn't have a 103 | rewritable ROM as most do. 104 | 105 | Some macros are used to simplify common tasks: 106 | 107 | Macro Behavior 108 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 109 | wreg addr,data Writes data to addr using LDH 110 | lda addr Loads byte from addr into A using LDH 111 | sta addr Stores A at addr using LDH 112 | delay n Delays n cycles, where NOP = 1 cycle 113 | delay_msec n Delays n milliseconds 114 | set_test n,"Cause" Sets failure code and optional string 115 | 116 | Routines and macros are documented where they are defined. 117 | 118 | -- 119 | Shay Green 120 | -------------------------------------------------------------------------------- /test_roms/instr_timing/instr_timing.gb: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/instr_timing/instr_timing.gb -------------------------------------------------------------------------------- /test_roms/instr_timing/readme.txt: -------------------------------------------------------------------------------- 1 | Game Boy CPU Instruction Timing Test 2 | ------------------------------------ 3 | This ROM tests the timings of all CPU instructions except HALT, STOP, 4 | and the 11 illegal opcodes. For conditional instructions, it tests taken 5 | and not taken timings. This test requires proper timer operation (TAC, 6 | TIMA, TMA). 7 | 8 | Failed instructions are listed as 9 | 10 | [CB] opcode:measured time-correct time 11 | 12 | Times are in terms of instruction cycles, where NOP takes one cycle. 13 | 14 | 15 | Verified cycle timing tables 16 | ---------------------------- 17 | The test internally uses a table of proper cycle times, which can be 18 | used in an emulator to ensure proper timing. The only changes below are 19 | removal of the .byte prefixes, and addition of commas at the ends, so 20 | that they can be used without changes in most programming languages. For 21 | added correctness assurance, the original tables can be found at the end 22 | of the source code. 23 | 24 | Normal instructions: 25 | 26 | 1,3,2,2,1,1,2,1,5,2,2,2,1,1,2,1, 27 | 0,3,2,2,1,1,2,1,3,2,2,2,1,1,2,1, 28 | 2,3,2,2,1,1,2,1,2,2,2,2,1,1,2,1, 29 | 2,3,2,2,3,3,3,1,2,2,2,2,1,1,2,1, 30 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 31 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 32 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 33 | 2,2,2,2,2,2,0,2,1,1,1,1,1,1,2,1, 34 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 35 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 36 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 37 | 1,1,1,1,1,1,2,1,1,1,1,1,1,1,2,1, 38 | 2,3,3,4,3,4,2,4,2,4,3,0,3,6,2,4, 39 | 2,3,3,0,3,4,2,4,2,4,3,0,3,0,2,4, 40 | 3,3,2,0,0,4,2,4,4,1,4,0,0,0,2,4, 41 | 3,3,2,1,0,4,2,4,3,2,4,1,0,0,2,4 42 | 43 | CB-prefixed instructions: 44 | 45 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 46 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 47 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 48 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 49 | 2,2,2,2,2,2,3,2,2,2,2,2,2,2,3,2, 50 | 2,2,2,2,2,2,3,2,2,2,2,2,2,2,3,2, 51 | 2,2,2,2,2,2,3,2,2,2,2,2,2,2,3,2, 52 | 2,2,2,2,2,2,3,2,2,2,2,2,2,2,3,2, 53 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 54 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 55 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 56 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 57 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 58 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 59 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2, 60 | 2,2,2,2,2,2,4,2,2,2,2,2,2,2,4,2 61 | 62 | 63 | Internal operation 64 | ------------------ 65 | Before each instruction is executed, the test sets up registers and 66 | memory in such a way that the instruction will cleanly execute and then 67 | end up at a common destination, without trashing anything important. The 68 | timing itself is done by first synchronizing to the timer via a loop, 69 | executing the instruction, then using a similar loop to determine how 70 | many clocks elapsed. 71 | 72 | 73 | Failure codes 74 | ------------- 75 | Failed tests may print a failure code, and also short description of the 76 | problem. For more information about a failure code, look in the 77 | corresponding source file in source/; the point in the code where 78 | "set_test n" occurs is where that failure code will be generated. 79 | Failure code 1 is a general failure of the test; any further information 80 | will be printed. 81 | 82 | Note that once a sub-test fails, no further tests for that file are run. 83 | 84 | 85 | Console output 86 | -------------- 87 | Information is printed on screen in a way that needs only minimum LCD 88 | support, and won't hang if LCD output isn't supported at all. 89 | Specifically, while polling LY to wait for vblank, it will time out if 90 | it takes too long, so LY always reading back as the same value won't 91 | hang the test. It's also OK if scrolling isn't supported; in this case, 92 | text will appear starting at the top of the screen. 93 | 94 | Everything printed on screen is also sent to the game link port by 95 | writing the character to SB, then writing $81 to SC. This is useful for 96 | tests which print lots of information that scrolls off screen. 97 | 98 | 99 | Source code 100 | ----------- 101 | Source code is included for all tests, in source/. It can be used to 102 | build the individual test ROMs. Code for the multi test isn't included 103 | due to the complexity of putting everything together. 104 | 105 | Code is written for the wla-dx assembler. To assemble a particular test, 106 | execute 107 | 108 | wla -o "source_filename.s" test.o 109 | wlalink linkfile test.gb 110 | 111 | Test code uses a common shell framework contained in common/. 112 | 113 | 114 | Internal framework operation 115 | ---------------------------- 116 | Tests use a common framework for setting things up, reporting results, 117 | and ending. All files first include "shell.inc", which sets up the ROM 118 | header and shell code, and includes other commonly-used modules. 119 | 120 | One oddity is that test code is first copied to internal RAM at $D000, 121 | then executed there. This allows self-modification, and ensures the code 122 | is executed the same way it is on my devcart, which doesn't have a 123 | rewritable ROM as most do. 124 | 125 | Some macros are used to simplify common tasks: 126 | 127 | Macro Behavior 128 | - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 129 | wreg addr,data Writes data to addr using LDH 130 | lda addr Loads byte from addr into A using LDH 131 | sta addr Stores A at addr using LDH 132 | delay n Delays n cycles, where NOP = 1 cycle 133 | delay_msec n Delays n milliseconds 134 | set_test n,"Cause" Sets failure code and optional string 135 | 136 | Routines and macros are documented where they are defined. 137 | 138 | -- 139 | Shay Green 140 | -------------------------------------------------------------------------------- /test_roms/testgb/PUZZLE.GB: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/testgb/PUZZLE.GB -------------------------------------------------------------------------------- /test_roms/testgb/RPN.GB: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/testgb/RPN.GB -------------------------------------------------------------------------------- /test_roms/testgb/SOUND.GB: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/testgb/SOUND.GB -------------------------------------------------------------------------------- /test_roms/testgb/SPACE.GB: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/testgb/SPACE.GB -------------------------------------------------------------------------------- /test_roms/testgb/SPRITE.GB: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/testgb/SPRITE.GB -------------------------------------------------------------------------------- /test_roms/testgb/TEST.GB: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/testgb/TEST.GB -------------------------------------------------------------------------------- /test_roms/workshop.rom: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/drhelius/demo-emulator/20fbe5669ec274ea9fdca7eb805a5c789519a93c/test_roms/workshop.rom --------------------------------------------------------------------------------