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

A cross-platform x86 assembler with an Intel-like syntax

bootOS is a monolithic operating system in 512 bytes of x86 machine code.

#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!

An Operating System for Z80 computers, written in assembly

BIOS for Intel 8088 based computers

Source code of GEOS 2.0 for the Commodore 64 and 128

bootBASIC is a BASIC language in 512 bytes of x86 machine code.

RadASM v2

Exercises for Assembly language course

Code for the 6502 microprocessor, mostly for the Replica 1 computer.

Commodore 64 BASIC and KERNAL Source

Proto Language AsSeMbler for All (formerly Apple)

Tiny assembler for 8086/8088, able to run over DOS for 8086/8088 machines.

Home of the HX DOS Extender and its included DPMI-host HDPMI.

Legacy: TTL-only CPU featuring UART I/O, an expansion port, 512KB SSD at up to 10MHz clock speed

Apple Disk Transfer ProDOS (ADTPro)

IP65 - a TCP/IP stack for 6502 based computers

Various emulator-related infos from all over the net.

Code related to the Motorola 68000 microprocessor.

FAT12/16/32 Bootsector for .COMs/.EXEs

A tiny operating system based on x86 architecture.

A new 8086-based reimagining of PC DOS and BASIC

Legacy: Full TTL-only home computer with VGA and PS/2 and twice the processing power of a Commodore 64

implementation of git.io/2048 written in LC-3 assembly, an educational computer architecture

OpenDos

This is the PICkitPlus device database repository. This is the device database used by PICkitPlus for the PICkit 2 and PICkit 3 programmers. The parts database is partially supported by the origina…

Virtual Machine, MOS 6502 emulator.

Multi-Floppy BIOS Extension