Best Open Source Assembly ROMs

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Browse free open source Assembly ROMs and projects below. Use the toggles on the left to filter open source Assembly ROMs by OS, license, language, programming language, and project status.

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1

EmuTOS

Free operating system for Atari computers, and more.

EmuTOS is a TOS compatible operating system for Atari ST series computers, and more. It is made from Digital Research's GPLed original sources and is a free and open source alternative to Atari proprietary ROMs.

7 Reviews

Downloads: 747 This Week

Last Update: 2026-09-23
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2

C-BIOS

C-BIOS is an open source BIOS for MSX computers.

C-BIOS is an open source BIOS for MSX computers. C-BIOS can be shipped with MSX emulators so they are usable out-of-the-box. This project aims to improve C-BIOS by fixing incompatibilities with the MSX BIOS and the development of a Disk ROM.

Downloads: 72 This Week

Last Update: 2022-09-08
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3

OpenSE BASIC

A free replacement firmware for the T/S 2000 derived from the T/S 1000 ROM.

6 Reviews

Downloads: 6 This Week

Last Update: 2013-04-16
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4

Cambridge Z88

Software development for 4Mb portable, using Z80 CPU and AA batteries

This project is for the portable computer "Cambridge Z88", produced by Sir Clive Sinclair (of ZX Spectrum fame). We continue to support software development (ROM, 3rd party apps on memory cards and desktop applications). We have moved to https://cambridgez88.jira.com/wiki (development, source code and documentation). However, we continue to publish files for download here.

Downloads: 15 This Week

Last Update: 2024-04-23
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5

Another Kernel

A kernel for your device

Downloads: 3 This Week

Last Update: 2023-09-20
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6

MK88 BIOS

Modiifed BIOS for MK88 PC

This project is aimed to produce modified MK88 BIOS with new features: 1. Improved keyboard driver 2. Support for cp866 encoding 3. Support for DS/DD drives 4. Support for ROM extension cards

Downloads: 0 This Week

Last Update: 2026-06-01
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7

MSX system sourcefiles

Sources of various MSX systems ROMS. The project aims at a complete commented assembly source file.

Downloads: 0 This Week

Last Update: 2026-09-20
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