Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.

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

Collection of malware source code for a variety of platforms in an array of different programming languages.

Hello world in every computer language. Thanks to everyone who contributes to this, make sure to see contributing.md for contribution instructions!

File formats dissections and more...

A running-jumping-swordfighting game I made on the Apple II from 1985-89

Dozens of minimal operating systems to learn x86 system programming. Tested on Ubuntu 17.10 host in QEMU 2.10 and real hardware. Userland cheat at: https://github.com/cirosantilli/linux-kernel-modu…

Disassembly of Pokémon Red/Blue

Disassembly of Pokémon Crystal

Soul of a tiny new machine. More thorough tests → More comprehensible and rewrite-friendly software → More resilient society.

An upgrade to Pokémon Crystal. Brings features and content up to date, and adds some original content.

Monospaced bitmap fonts

Doom/FX for Super Nintendo with SuperFX GSU2A

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

Official repository for 8086tiny: a tiny PC emulator/virtual machine

Psychological warfare in reverse engineering

Incompatible Timesharing System

Disassembly of Legend of Zelda: Links Awakening DX

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

The Touhou PC-98 Restoration Project

Tetris that fits into the boot sector.

Hello World in all possible programmnig languages

Ping-Pong-like game in Assembly that works without OS

The open-source city building game for Game Boy Color.

A Game Boy emulator for the TI-84 Plus CE and TI-83 Premium CE.

Fully documented source code for the classic game Elite on the Nintendo Entertainment System (NES)

Sonic 1 Disassembly

CP/M for the 6502