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

Doom/FX for Super Nintendo with SuperFX GSU2A

The development kit for over a hundred z80 family machines - c compiler, assembler, linker, libraries.

Disassembly of Legend of Zelda: Links Awakening DX

Source code for 'Low-Level Programming' by Igor Zhirkov

An Operating System for Z80 computers, written in assembly

BIOS for Intel 8088 based computers

Fully documented and annotated source code for the cassette version of Elite on the BBC Micro

Assembly Programming and Computer Architecture for Software Engineers

Command-line cross-compiler of assembly language for Z80 CPU.

Sonic 1 Disassembly

Minimal 68000-based single board computer

Fully annotated disassembly of the original Metal Gear game (MSX2, Konami, 1987, RC750)

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

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

Sonic 2 Disassembly

A complete disassembly of The Legend of Zelda

Sonic and Knuckles Disassembly

Disassembly of Super Mario Bros 3

Source code of some NES games

Atari ST ACSI to SD card converter with a STM32

Sample source code games Atari 2600

The Amiga Diagnostic tool

Pinball Fantasies (MS-DOS Port)

SMW Disassembly X

Source code for an unpublished Days of Thunder game for the NES, not to be confused with the published game released by the same publisher this game was developed for, Mindscape, in 1990.

Apple Disk Transfer ProDOS (ADTPro)