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

A FPGA friendly 32 bit RISC-V CPU implementation

The CORE-V CVA6 is a highly configurable, 6-stage RISC-V core for both application and embedded applications. Application class configurations are capable of booting Linux.

Proof of Concepts (PE, PDF...)

OS for z80 calculators

#FreeGEOS source codes. The offical home of the PC/GEOS operating system technology. For personal computing fans. For all developers and assembly lovers. For YOU!

eXtended Memory Manager (XMM) that can manage memory beyond the 4 GB barrier, up to 1 terabyte.

Source code of 8-bit GEOS 6.0 for the MEGA65

NeoScrypt, a Strong Memory Intensive Key Derivation Function

A Blake3 provider implementation for OpenSSL