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Gearsystem

MCP.Pizza Chef: drhelius

Gearsystem plays Master System, Game Gear, and SG-1000 titles on Windows, macOS, Linux, and BSD, and it ships with a built-in connection for AI assistants such as Claude, GitHub Copilot, and Codex. Once connected, the assistant can start and pause the game, rewind, read the console's memory, and report hardware status. That makes it useful for people writing retro homebrew, editing old cartridges, or simply curious about how a game works underneath. No account or key is required.

Coding
Other

Use This MCP server To

Ask why my homebrew game crashes on a real Master System Rewind the last few seconds of play to catch a bug Read what a game stores in memory during a level Pause the game and step through what the processor does next Play Game Gear and SG-1000 cartridges on my Mac or PC Check which sprites and tiles a game is drawing right now

README

Gearsystem

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Gearsystem is a very accurate, cross-platform Sega Master System / Game Gear / SG-1000 emulator written in C++ that runs on Windows, macOS, Linux, BSD and RetroArch, with an embedded MCP server for debugging and tooling.

This is an open source project with its ongoing development made possible thanks to the support by these awesome backers. If you find it useful, please consider sponsoring.

Don't hesitate to report bugs or ask for new features by opening an issue.

Downloads

Gearsystem FAQ

Which assistants can control it?
The built-in connection is documented for GitHub Copilot, Claude, and Codex, and other MCP-compatible assistants should work the same way.
Do I need an account or key?
No. Everything runs on your own machine and nothing is sent to an outside service.
Can I use this to debug a game I am writing?
Yes — the assistant can pause execution, inspect memory, and report hardware status while the game runs.
What do I need to install?
Download the free app for Windows, macOS, Linux, or BSD, then point your assistant at the emulator's connection details.
Does it come with games?
No. You supply your own cartridge files, and the emulator runs with or without a console BIOS.
Which consoles does it cover?
Sega Master System, Game Gear, SG-1000, Sega Mark III, and Othello Multivision.