├── images ├── femaleheader.jpg ├── rev1 │ ├── build.jpg │ ├── pcb_top.png │ ├── par_pcb_top.png │ ├── pcb_bottom.png │ ├── 1541installed.jpg │ ├── SX64installed.jpg │ ├── par_pcb_bottom.png │ └── 1541parinstalled.jpg ├── stackableheader.jpg └── stackableheader2.jpg ├── schematics ├── CBM Drive ID Switch Rev 1.1.pdf └── CBM Drive ID Switch Parallel Rev 1.pdf ├── gerbers ├── CBM Drive ID Switch Rev 1.1 v22_2023-03-19.zip └── CBM Drive ID Switch Parallel Rev 1 v4_2023-03-19.zip ├── firmware ├── compiled │ ├── CBM_drive_ID_switch_fw_v1_1_48_48a.hex │ ├── CBM_drive_ID_switch_fw_v1_1_88_88a.hex │ ├── CBM_drive_ID_switch_fw_v1_1_48p_48pa_48pb.hex │ ├── CBM_drive_ID_switch_fw_v1_1_88p_88pa_88pb.hex │ └── CBM_drive_ID_switch_fw_v1_1_328_328p_328pb.hex └── source │ └── CBM_drive_ID_switch_fw_v1_1 │ └── CBM_drive_ID_switch_fw_v1_1.ino ├── README.md └── LICENSE /images/femaleheader.jpg: -------------------------------------------------------------------------------- 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/firmware/source/CBM_drive_ID_switch_fw_v1_1/CBM_drive_ID_switch_fw_v1_1.ino: -------------------------------------------------------------------------------- 1 | /* 2 | ######################################################################################### 3 | # # 4 | # ID switch sketch for CBM disk drives # 5 | # To be used with the Retroninja CBM Drive ID Switch in all CBM IEC drives # 6 | # # 7 | # Version 1.1 # 8 | # https://github.com/retronynjah # 9 | # # 10 | ######################################################################################### 11 | */ 12 | 13 | #include 14 | 15 | // searchString is the command that is used for switching ROM. 16 | // It is passed by the 1541-II in reverse order so the variable should be reversed too. 17 | // The command should be preceded by a ROM number between 1 and 4 when used. 18 | // The below reversed searchString in hex ascii is MORNR@ which is specified like this on the C64: 1@RNROM, 2@RNROM and so on. 19 | //byte searchString[] = {0x4D,0x4F,0x52,0x4E,0x52,0x40}; 20 | //1@RNDRVID 21 | //DIVRDNR@ 22 | byte searchString[] = {0x44,0x49,0x56,0x52,0x44,0x4E,0x52,0x40}; 23 | 24 | // pin defitions 25 | #define RESETPIN 10 26 | #define CLOCKPIN 13 27 | #define LEDPIN A0 28 | #define LOWBIT 8 29 | #define HIGHBIT 9 30 | 31 | int commandLength = sizeof(searchString); 32 | int bytesCorrect = 0; 33 | volatile bool state; 34 | static byte byteCurr; 35 | 36 | void pciSetup(byte pin) 37 | { 38 | *digitalPinToPCMSK(pin) |= bit (digitalPinToPCMSKbit(pin)); // enable pin 39 | PCIFR |= bit (digitalPinToPCICRbit(pin)); // clear any outstanding interrupt 40 | PCICR |= bit (digitalPinToPCICRbit(pin)); // enable interrupt for the group 41 | } 42 | 43 | 44 | 45 | ISR (PCINT0_vect) // handle pin change interrupt for D8 to D13 here 46 | { 47 | // read state of pin 13 48 | state = PINB & B00100000; 49 | } 50 | 51 | 52 | void cleareeprom(){ 53 | for (int i = 0 ; i < EEPROM.length() ; i++) { 54 | EEPROM.write(i, 0); 55 | } 56 | } 57 | 58 | 59 | void resetdrive(){ 60 | 61 | digitalWrite(RESETPIN, LOW); 62 | pinMode(RESETPIN, OUTPUT); 63 | delay(50); 64 | digitalWrite(RESETPIN, HIGH); 65 | pinMode(RESETPIN, INPUT); 66 | 67 | } 68 | 69 | 70 | void switchid(byte deviceid){ 71 | switch (deviceid){ 72 | case 8: 73 | // device 8 74 | digitalWrite(LOWBIT , LOW); 75 | digitalWrite(HIGHBIT , LOW); 76 | break; 77 | case 9: 78 | // device 9 79 | digitalWrite(LOWBIT , HIGH); 80 | digitalWrite(HIGHBIT , LOW); 81 | break; 82 | case 0: 83 | // device 10 84 | digitalWrite(LOWBIT , LOW); 85 | digitalWrite(HIGHBIT , HIGH); 86 | break; 87 | case 1: 88 | // device 11 89 | digitalWrite(LOWBIT , HIGH); 90 | digitalWrite(HIGHBIT , HIGH); 91 | break; 92 | default: 93 | break; 94 | } 95 | 96 | byte savedid = EEPROM.read(0); 97 | if (savedid != deviceid){ 98 | EEPROM.write(0, deviceid); 99 | } 100 | delay(50); 101 | resetdrive(); 102 | /* 103 | for (int x = 0; x <= deviceid; x++){ 104 | digitalWrite (LEDPIN, HIGH); 105 | delay(30); 106 | digitalWrite (LEDPIN, LOW); 107 | delay(250); 108 | } 109 | delay (200); 110 | */ 111 | } 112 | 113 | 114 | void setup() { 115 | 116 | pinMode(LOWBIT, OUTPUT); // device ID low bit (6522 pin 15) 117 | pinMode(HIGHBIT, OUTPUT); // device ID high bit (6522 pin 16) 118 | digitalWrite(LOWBIT,HIGH); 119 | digitalWrite(HIGHBIT,HIGH); 120 | pinMode(CLOCKPIN, INPUT); // R/!W 121 | pinMode(RESETPIN, INPUT); // Keep reset pin as input while not performing reset. 122 | 123 | pinMode (LEDPIN, OUTPUT); 124 | 125 | // set data pins as inputs 126 | DDRD = B00000000; 127 | 128 | // retrieve last used device ID from ATmega EEPROM and switch ID using CIA pin 15/16 129 | int lastid = EEPROM.read(0); 130 | if (lastid > 9){ 131 | cleareeprom(); 132 | lastid = 8; 133 | } 134 | switchid(lastid); 135 | 136 | // enable pin change interrupt on pin D13(PB5) connected to R/W on 6522 137 | pciSetup(CLOCKPIN); 138 | 139 | } 140 | 141 | 142 | void loop() { 143 | 144 | if (state == HIGH){ 145 | byteCurr = PIND; 146 | state=LOW; 147 | 148 | // we don't have full search string yet. check if current byte is what we are looking for 149 | if (byteCurr == searchString[bytesCorrect]){ 150 | // It is the byte we're waiting for. increase byte counter 151 | bytesCorrect++; 152 | if (bytesCorrect == commandLength){ 153 | // we have our full search string. wait for next byte 154 | while(state == LOW){} 155 | byteCurr = PIND; 156 | // This byte should be the id number 157 | // valid numbers are 1-4 (ASCII 49-52) 158 | if ((byteCurr >= 48)&&(byteCurr<=57)){ 159 | // rom number within valid range. Switch rom 160 | switchid(byteCurr - 48); 161 | } 162 | else if(byteCurr == searchString[0]){ 163 | // it was the first byte in string, starting with new string 164 | bytesCorrect = 1; 165 | } 166 | else{ 167 | bytesCorrect = 0; 168 | } 169 | } 170 | } 171 | // byte isn't what we are looking for, is it the first byte in the string then? 172 | else if(byteCurr == searchString[0]){ 173 | // it was the first byte in string, starting with new string 174 | bytesCorrect = 1; 175 | } 176 | else { 177 | // byte not correct at all. Start over from the beginning 178 | bytesCorrect = 0; 179 | } 180 | } 181 | 182 | } 183 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # CBM Drive ID Switch 2 | PCB rendering PCB rendering 3 | 4 | This is a software controlled device ID switch for Commodore disk drives. It can be installed in any Commodore IEC disk drive but it only makes sense to install it in the drives that lack external DIP switches for ID selection but handy for the 1541 drive and for computers with built-in disk drives such as SX-64, C128D and C128DCR. 5 | 6 | ## How it works 7 | There's a microcontroller on the PCB that listens for strings of text on the drive data bus. Once a predefined string of bytes arrives on the bus, it flips the drive ID select pins on the VIA and resets the drive. 8 | The command that the drive listens for is x@RNDRVID where x is a number representing the drive ID to switch to. 9 | Valid device numbers are 8, 9, 10, 11. In the switch command, these are specified as 8, 9, 0, 1. I.e. 0@RNDRVID is the command for switching to device #10. See the usage section for more information on the command. 10 | 11 | 12 | ## Installation 13 | 14 | The installation is quite simple if the VIA chips are socketed. Just remove the correct VIA chip (MOS 6522) indicated in the table below, then install the switch in the socket and install the VIA chip in the switch. There is a notch printed on the top of the switch. This notch should be aligned with the notch on the socket. 15 | If the VIA is soldered to the PCB you will need to first desolder the VIA and install a socket (unless you want to solder the switch to the PCB which I wouldn't recommend). If you need to remove the VIA chip from the switch, be careful with the compoments on top of the PCB. Don't use any sharp objects to pry the chip out of the headers. 16 | 17 | 18 | |Model | VIA | 19 | |:-----------: |:-----------: | 20 | |1541 | UC3 or UAB1 | 21 | |1571 (in 128D) | U9 | 22 | |128DCR | U106 | 23 | |SX-64 | UBC3 | 24 | 25 | 26 | Switch installed in a CBM 1541 27 | Switch installed in an SX-64 28 | 29 | ## Usage 30 | 31 | The device ID can be switched from basic using regular CBM DOS commands or by using DOS wedge commands from JiffyDOS or similar. 32 | Once the ID has been switched, the ID is saved and the drive will startup with the new ID until the ID is changed again. Resetting or power cycling the drive doesn't affect the saved ID. 33 | 34 | In the below examples we switch ID of device #8 to device #9. 35 | 36 | #### From CBM DOS 37 | 38 | The easiest command to use to get bytes on the drive bus is the LOAD command but other disk commands can be used too. 39 | ```LOAD "9@RNDRVID",8``` 40 | This generates a file not found error (unless you have a file named 9@RNDRVID ;) ). This error is to be expected and nothing to worry about. 41 | 42 | #### From JiffyDOS 43 | ```@"9@RNDRVID",8``` 44 | or activate the drive first using CTRL+D or using @8 and use this command: 45 | ```@9@RNDRVID``` 46 | 47 | 48 | ## BOM 49 | 50 | 51 | |Qty|Identifier |Part |Comments | 52 | |---|---------- |---------------------------|-----------------------------------| 53 | | 1 |IC2 |ATmega48A (TQFP32) |Or compatible | 54 | | 1 |IC4 |SN74AHCT273NSR (SO20) | | 55 | | 1 |IC5 |SN74AHCT1G04DBVR (SOT23-5) | | 56 | | 3 |C1,C2,C5 |100nF 0805 |Ceramic capacitor | 57 | | 2 |C3,C4 |30pF 0805 |Ceramic capacitor | 58 | | 1 |R1 |10kΩ 0805 | | 59 | | 1 |Y1 |ECS-200-20-3X-TR |Crystal 20MHz | 60 | | 2 | |Female header row |20pin 2.54mm (for VIA chip) | 61 | | 2 | |Male header row |20pin 2.54mm (round or flat pins) | 62 | | 1 |D1 |LED 0805 |Optional | 63 | | 1 |R2 |560Ω 0805 |Optional | 64 | 65 | You can use any larger pin-compatible ATmega MCU such as ATmega88 or ATmega328. 66 | All variants seem to work including the not 100% pin-compatible PB version. 67 | The test points TP1 and TP2 are connected to ATmega pins PC1 and PC2 (Arduino pins A1 and A2) and can possibly be used for debugging or for some external connections. 68 | The optional LED (D1) and its resistor can also be used for debugging purposes but are difficult to see when VIA is installed so the may as well be left out. 69 | 70 | Installaion in the plastic version of C128D with the 1571 controller board covered by an RF shield requires a low profile switch. Flat stackable headers (Arduino shield headers) soldered from the top side is recommended in this case. 71 | Stackable type header 72 | Place a socket under the PCB and insert the stackable header pins through the PCB and solder them in place from the top side. The PCB can be removed from socket after soldering a pin on each end. The angle of the pins can then be adjusted before soldering the rest of the pins. 73 | Stackable header inserted for soldering 74 | When done, cut off the header part so that only the bottom part of the pins are left. 75 | I haven't found any 20-pin stackable headers but two 10-pin headers on each side works fine. 76 | 77 | Round machined headers add a few millimeters to the height but is fine in C128DCR, SX-64 and 1541 which all have more headroom. 78 | 79 | 80 | Completed switch 81 | 82 | 83 | ## Parallel version 84 | I also made a version with a header for a parallel cable since parallel connections can be made using the same VIA. 85 | PCB rendering PCB rendering 86 | 87 | It can be used with SpeedDos ROM+Kernal and a userport adapter such as the one designed by Sven Petersen: 88 | https://github.com/svenpetersen1965/1541-parallel-adapter-SpeedDOS 89 | The header on the Drive ID Switch has the same pinout as the one on Sven Petersen's 1541 adapter. 90 | With the proper cable, the parallel interface can also be used for nibble transfers with a Zoomfloppy or similar interface. 91 | 92 | Switch installed in an SX-64 93 | 94 | The pin-out of the parallel connector is connected to VIA pins according to the below table. 95 | 96 | |Header pin |VIA pin | 97 | |-----------|-----------| 98 | |1 |CA2 (39) | 99 | |2 |PA0 (2) | 100 | |3 |PA1 (3) | 101 | |4 |PA2 (4) | 102 | |5 |PA3 (5) | 103 | |6 |PA4 (6) | 104 | |7 |PA5 (7) | 105 | |8 |PA6 (8) | 106 | |9 |PA7 (9) | 107 | |10 |CB1 (18) | 108 | -------------------------------------------------------------------------------- /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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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 | 635 | Copyright (C) 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 | Copyright (C) 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 | --------------------------------------------------------------------------------