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

Source code of GEOS 2.0 for the Commodore 64 and 128

Microsoft BASIC for 6502 (Commodore, Apple, KIM-1, AIM-65, OSI, ...)

Official RC2014 repository for hardware schematics / software and more!

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

GEOS KERNAL v2.0 - commented source code for GEOS 2.0 C64 with cleanups and optimizations

A C64 based palette editor for c0pperdragon's C64-Video-Enhancement project

Experimental MEGAG65 extensions to C64 BASIC 2

Fictional computer system based on an emulated 6502 CPU.

Ultibo baremetal port of 8086tiny: a tiny PC emulator/virtual machine