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…

A FPGA friendly 32 bit RISC-V CPU implementation

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

Incompatible Timesharing System

An Operating System for Z80 computers, written in assembly

A project to resurrect Unix on the PDP-7 from a scan of the original assembly code

sectorforth is a 16-bit x86 Forth that fits in a 512-byte boot sector.

Original source code for Impulse Tracker, a music tracker for DOS

CP/M for the 6502

A 6502 based laptop design

Pong revolution.

Atari ST tool to clean the Ghost virus

A public-domain OS based on MMURTL.

The f/One family of DOS Extenders