A stand-alone, BASIC-programmable microcontroller and microcomputer in one! The fastest, cheapest, most hackable 8-bit computer ever.

This is a reconstruction of the original 1981-82 IBM PC BIOS source code using scanning and transcription of the BIOS listings found in the IBM Technical Reference manuals.

Repository for information about setting up and using Sony NEWS workstations and NEWS-OS, Sony's Unix distribution from the late 1980s to the mid/late 1990s.

This is a small adapter, in the form of a daughter board, which fits into the socket of the "Sally" CPU of the Atari 800XL microcomputer. It replaces that CPU with a CMOS, modern, low-power, fully static, currently in production W65C02S and some auxiliary logic. The project has been featured in three videos in my YouTube channel ("The Byte Attic,"

Open Hardware 16/32/64 Kb Cartridge for the Commodore 16, 116 and Plus/4

Reverse-engineering documentation about the Q1 microcomputers, the world's first true microcomputers (1972) with integrated microprocessors.

A virtual Atari ST disk over serial for Windows, Linux and macOS

Open Hardware 64 Kb RAM Expansion for the Commodore 16

VC83 BASIC for 6502

Replace the Commodore Datassette with any audio source!

User Port Cartridge for the Commodore 16, 116 and Plus/4

Draegerman for Agon Light and Console8

An AdLib card for your Commodore 16/116/+4!

Catalog of games and software for the Soviet home computer Elektronika BK-0010[-01] and BK-0011[M]

✳️ PTSource X86 DOS OS Builder is a flexible system creation toolkit designed to help you build minimal custom DOS-compatible operating systems for x86 hardware, based on the Microsoft DOS open-source codebase.

My VIC-20 apps projects

Internal 64 kB RAM Expansion for the Commodore 16

Replace the Commodore Datassette with any audio source!

Expansion Port Expander for the Commodore 16, 116 and Plus/4

A BBC BASIC v3 port of the horror interactive fiction game coded for the Commodore 64 by Mark S. Boucher