Free operating system for Atari computers, and more.
Software development for 4Mb portable, using Z80 CPU and AA batteries
A single-user single-task ROM-based OS for my 8-bit homebrew computer
C-BIOS is an open source BIOS for MSX computers.
Sega system-16 emulator
Complete, Fast, Accurate, Game Boy/CGB/SGB Emulator.