├── 8-bit Computer Final Build 3 Digit Display.JPG ├── 8-bit Computer Final Build 4 Digit Display.JPG ├── Ben Eater SAP 8-bit computer diagram 4-9-2017.vsd ├── Ben Eater SAP 8-bit computer diagram 4-9-2017.xps ├── EEPROM Data Reference + Instructions + Anode v3.xlsx ├── Jump Circuit.pdf ├── My Build Parts List with Links and Prices updated 4-12-2017.xlsx ├── My Build Parts List.pdf ├── My Programs.pdf ├── My Roms Programming.rar ├── Picture of Breadboard Layout.JPG ├── README.md ├── RI Write Triger Circuit 2.png └── Ram Write Modifications.png /8-bit Computer Final Build 3 Digit Display.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/8-bit Computer Final Build 3 Digit Display.JPG -------------------------------------------------------------------------------- /8-bit Computer Final Build 4 Digit Display.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/8-bit Computer Final Build 4 Digit Display.JPG -------------------------------------------------------------------------------- /Ben Eater SAP 8-bit computer diagram 4-9-2017.vsd: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/Ben Eater SAP 8-bit computer diagram 4-9-2017.vsd -------------------------------------------------------------------------------- /Ben Eater SAP 8-bit computer diagram 4-9-2017.xps: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/Ben Eater SAP 8-bit computer diagram 4-9-2017.xps -------------------------------------------------------------------------------- /EEPROM Data Reference + Instructions + Anode v3.xlsx: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/EEPROM Data Reference + Instructions + Anode v3.xlsx -------------------------------------------------------------------------------- /Jump Circuit.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/Jump Circuit.pdf -------------------------------------------------------------------------------- /My Build Parts List with Links and Prices updated 4-12-2017.xlsx: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/My Build Parts List with Links and Prices updated 4-12-2017.xlsx -------------------------------------------------------------------------------- /My Build Parts List.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/My Build Parts List.pdf -------------------------------------------------------------------------------- /My Programs.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/My Programs.pdf -------------------------------------------------------------------------------- /My Roms Programming.rar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/My Roms Programming.rar -------------------------------------------------------------------------------- /Picture of Breadboard Layout.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/Picture of Breadboard Layout.JPG -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # 8-bit-SAP-Breadboard-Computer-by-Space-Man 2 | 3 | This is my build of Ben Eater's 8-bit breadboard computer. 4 | Posted videos of my Build. 5 | https://www.youtube.com/channel/UCy30KFB296CIdccvAtxhpkA 6 | 7 | Ben Eater's 8 Bit computer videos. 8 | Building an 8-bit breadboard computer! 9 | https://www.youtube.com/playlist?list=PLowKtXNTBypGqImE405J2565dvjafglHU 10 | 11 | Ben Eater SAP 8-bit computer diagram 4-9-2017.vsd This is a MS Office Visio file (.vsd). You can get a Visio viewer if you don't have Visio. I included an XPS file format as well. Using the Visio file you will find it helpful when building it as you can highlight a connection line and it will show you the two connection points. 12 | 13 | List of Issues encounter building the computer 14 | 15 | Adder Circuit 3-10-2017 ( Reversed Data Lines ) 16 | 17 | Clock Circuit 3-13-2017 (1 MEG Resistor connected to 5v not Ground) 18 | 19 | Clock Circuit – Debounce adjustment need .5 second delay ( 1uf x 470K = 470ms) 20 | 21 | MAR MI Address Lines reversed 22 | 23 | PC – Added Clear Signal 24 | 25 | OP Code – Reset was tide to HIGH Causing count to 7 not 5 26 | 27 | Added Reset Buttons 28 | 29 | RI needs to be High to Write to RAM, Since a NAND gate inverts the signal w/Clock 30 | 31 | Corrected Jump Circuit Only One Nand gate IC ( 4 Nand Gates Used) 32 | 33 | Fixed RAM Write issue - Needed to isolate the clock from the RC circuit. Fixed feedback noise. 34 | 35 | Added 10K Resistor to Write button in Program Mode (Pull-up to 5 v instead of Floating) 36 | 37 | Added RC Circuit to absorb spikes during switching between Run and Program mode. (Not in Picture but in Diagram) This Fixed issue where switching between Run and Program mode caused Memory Write signal to go low clearing RAM contents. 38 | 39 | -------------------------------------------------------------------------------- /RI Write Triger Circuit 2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/RI Write Triger Circuit 2.png -------------------------------------------------------------------------------- /Ram Write Modifications.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/space1649/8-bit-SAP-Breadboard-Computer-by-Space-Man/3dc8388798de1f56130c106197572f796818c56a/Ram Write Modifications.png --------------------------------------------------------------------------------