jCPU: My homebuilt 8-bit Ben Eater inspired CPU =============================================== A few months ago, inspired by Ben Eater's wonderful Youtube video series, I built my very own 8-bit CPU from scratch, on breadboards using basic digital logic components (gates, latches, EEPROMs). I have documented the entire adventure on my Youtube channel: https://www.youtube.com/channel/UCH09NwwJsfThwLKvc6kxl4Q This repository contains the supporting software for this project. It is divided into a number of sub-projects: + arduino/ contains the Arduino C++ code, which is used to program the various EEPROMs used in the project. ---+ arduino/DigitalDisplay/ programs an EEPROM to display decimal digits, based on 8-bit bainry input. See https://www.youtube.com/watch?v=b3iytSzYhSs ---+ arduino/Erase/ erases an entire EEPROM, resetting every byte to 0xFF ---+ arduino/Microcode/ programs microcode into the 4 EEPROMs, which make up the control unit. See https://www.youtube.com/watch?v=CE615IDVVNA and https://www.youtube.com/watch?v=O_mTxnFYLXE ---+ arduino/libraries/MyEEPROM/ support library to provide high-level EEPROM read- and write-functions. See https://www.youtube.com/watch?v=b3iytSzYhSs + assembler/ A very simple assembler, written in C, using UN*X lex and yacc, which can translate the assembly files in programs/ to machine code, suitable for the 8-bit CPU. See https://www.youtube.com/watch?v=-_u6HhAb5mo&t=1509s + programs/ Contains several example programs in assembly for the 8-bit CPU. Some (primes.s and qsport.s) are hand-compiled from corresponding C-code. Others were written in assembly from scratch. + schematics/ generated PDF, and source .sch (gEDA schematics) files, for electrical schematics describing the various parts of the 8-bit CPU. Shown throughout the videos in the series.