computer

A microcomputer built from Soviet-era parts, developed for a History research project looking into technology behind the Iron Curtain.

The computer's design is based around a U880 processor, manufactured by the East German government. It has 8 KB of ROM and 4 KB of RAM. (unfortunately, the Soviet ROM and RAM parts I purchased didn't work, so the actual computer uses modern-day but functionally equivalent parts.) For input and output, it features a serial port, a 128x64 LCD display (a modern-day substitute for the bulky CRT monitors of the time, to make the computer easier to transport and use), and 6 buttons. These specifications, combined with the datecodes on the different parts, place the computer somewhere in the late 80s.

This repository serves as a place to link to the respositories for the different components involved in the computer's design and construction.

computer-hw: The electrical schematic and PCB layout files, in KiCad and PDF formats.
computer-fw: The source code to the computer's firmware, written in Z80 assembly language.
computer-emu: An emulator for the computer, written in Go, which allows you to test changes made to the code without needing to go through the annoying process of reprogramming the flash chips.
z80asm: A custom assembler for the computer, capable of producing Z80 machine code that works with the weird ROM layout of the system.

thatoddmailbox/computer

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