The original sources of MS-DOS 1.25, 2.0, and 4.0 for reference purposes

Microsoft BASIC for 6502 Microprocessor - Version 1.1

A FPGA friendly 32 bit RISC-V CPU implementation

Source code and data of Second Reality by Future Crew in 1993

Monospaced bitmap fonts

A large collection of NES accuracy tests on a single NROM cartridge.

Modern Generic SVGA driver for Windows 3.1

Collection of Game Boy test roms.

BIOS for Intel 8088 based computers

PC-MOS/386 v5.01 and up, including cdrom driver sources.

Fully documented and annotated source code for Elite on the Commodore 64

System Software for Z80/Z180/Z280 Computers

CP/M for the 6502

N64 Bare Metal Mips Assembly Programming

A tiny x86 retro computer

A large repository of Atari ST (and family) source code

A modern, scratch-built, open-source (GPLv3) alternative ROM BIOS for PC, XT, 8088 Clone or Turbo PCs.

A project to create unencumbered open-source ROMs for use on selected retro computers

Atari ST ACSI to SD card converter with a STM32

The Amiga Diagnostic tool

IBM AT 80286 BIOS

Reverse-engineering efforts to generate license keys for Raspberry Pi hardware video decoding

Amiga programming examples

ISA 8-Bit Ethernet Controller

An on-going conversion of Scoopex's incredible Amiga Hardware Programming Series on YouTube into C

Simple Yet Powerful RISC-V Computer

Enhanced DR-DOS kernel and command interpreter ported to JWasm and OpenWatcom C

PS3 payloads for PSGroove/PSFreedom/Other in order to 'jailbreak' the PS3

HippoPlayer - a module player for the classic Amiga

Fastest Amiga Module player ever