There are 7 repositories under retroprogramming topic.
Curated list of references for development of DOS applications.
CROSS LIB - A universal 8-bit library and some games built with it
VGA mode 13h programming in x86 Assembly
An isomorphic gamelib for retrocomputers
SHARP X1 (CZ-800 series) compatible free IPL ROM.
The UMPK-80 Emulator (CORE) is an open-source project that aims to provide a simple and modern INTEL 8080 / KR580VM80A-based microcomputer emulator.
My first DOS game: revived!
Original SNES Star Fox source code restored to produce 1:1 retail ROM releases on compile
1990s-style graphical effects for MS-DOS
A simple DOS file CRC-16 program. Pre-release. Written in Borland C++ in 1997.
Iconic "digital rain" effect from The Matrix. Written in Z80 assembler for ZX Spectrum.
A mix of graphical effects for MS-DOS written in C
A remake of 2001 NAAG intro
Retro TRex Game Jam
DRCHECK (Disk Routine Check) is a disk DOS-level surface scanner
A Basic environment coding by ruby
An example of using the SDSC Debug Console in both C & Z80 assembly.
Some easy projects for cc65 compiler suite. Mostly C-written.
A break-out clone coded in Commodore64 Basic
Inspired by AfterDark Flying Toasters screensaver from the 1990s, this is a "screensaver" for the Commodore 64.
A minimalist CHIP-8 interpreter/emulator (ANSI/TERM).
Very simple benchmark involving a cube for Classic Mac OS System 7