Gearsystem
Sega Master System / Game Gear / SG-1000 emulator, debugger and embedded MCP server for macOS, Windows, Linux, BSD and RetroArch.
What is Gearsystem?
Gearsystem is a Model Context Protocol (MCP) server that allows AI assistants like Claude, Cursor, and VS Code to sega master system / game gear / sg-1000 emulator, debugger and embedded mcp server for macos, windows, linux, bsd and retroarch.
Sega Master System / Game Gear / SG-1000 emulator, debugger and embedded MCP server for macOS, Windows, Linux, BSD and RetroArch.
This server falls under the Developer Tools category on MCPgee, the world's largest MCP server directory with 33,000+ servers.
Features
- Sega Master System / Game Gear / SG-1000 emulator, debugger
Use Cases
Maintainer
Works with
Installation
Manual Installation
npx gearsystemConfiguration
Configuration Details
claude_desktop_config.json
Performance
Response Metrics
Resource Usage
How to Set Up and Use Gearsystem
Gearsystem is a cycle-accurate Sega Master System, Game Gear, and SG-1000 emulator that includes an embedded MCP server for AI-assisted game debugging. The MCP integration allows AI agents like Claude, GitHub Copilot, or Codex to control emulation, inspect memory, set breakpoints, disassemble code, and analyze hardware state in real time. Retro game developers, ROM hackers, and researchers use it to leverage AI assistants for understanding and debugging classic Sega game code.
Prerequisites
- A compiled Gearsystem binary for your platform (Windows, macOS, Linux, or BSD) — build from source or download a release
- A Sega Master System, Game Gear, or SG-1000 ROM file for testing
- An MCP-compatible client such as Claude Desktop or Claude Code
- Optional: GEARSYSTEM_MCP_HTTP_TOKEN environment variable set if using HTTP transport with authentication
Build or download Gearsystem
Clone the repository and build using CMake, or download a prebuilt binary from the GitHub releases page for your operating system.
git clone https://github.com/drhelius/Gearsystem.git
cd Gearsystem
mkdir build && cd build
cmake .. && makeLaunch Gearsystem with stdio MCP transport
Start Gearsystem in headless mode with the MCP stdio transport enabled so Claude Desktop can connect to it as an MCP server.
./Gearsystem --headless --mcp-stdio /path/to/game.smsOr launch with HTTP MCP transport
Alternatively, use HTTP transport for connections from tools that prefer HTTP. You can bind to a custom address and port.
./Gearsystem --headless --mcp-http --mcp-http-address 127.0.0.1 --mcp-http-port 7777 /path/to/game.smsSet optional authentication token for HTTP transport
If using HTTP transport, you can secure it with a bearer token by setting the GEARSYSTEM_MCP_HTTP_TOKEN environment variable before starting.
export GEARSYSTEM_MCP_HTTP_TOKEN=your_secret_token
./Gearsystem --headless --mcp-http /path/to/game.smsConfigure Claude Desktop to connect via stdio
Add Gearsystem to your claude_desktop_config.json using the stdio transport flags so Claude can control the emulator.
{
"mcpServers": {
"gearsystem": {
"command": "/path/to/Gearsystem",
"args": ["--headless", "--mcp-stdio", "/path/to/game.sms"]
}
}
}Gearsystem Examples
Client configuration
Claude Desktop configuration for Gearsystem using stdio transport in headless debugging mode.
{
"mcpServers": {
"gearsystem": {
"command": "/usr/local/bin/Gearsystem",
"args": ["--headless", "--mcp-stdio", "/home/user/roms/sonic.sms"],
"env": {
"GEARSYSTEM_MCP_HTTP_TOKEN": ""
}
}
}
}Prompts to try
Example prompts to debug Sega Master System games using the Gearsystem MCP server.
- "Read the memory at address 0xC000 and tell me what data is stored there"
- "Disassemble the code starting at the current program counter address"
- "Set a breakpoint at address 0x0150 and resume execution"
- "Show me the current CPU register state including A, BC, DE, HL, and SP"
- "Rewind the emulator 60 frames and re-examine memory state"Troubleshooting Gearsystem
Gearsystem exits immediately when launched headless
Ensure you provide a valid ROM file path as an argument. The --headless flag requires --mcp-stdio or --mcp-http to be specified along with a ROM path, otherwise there is no GUI or transport to keep it running.
Claude Desktop cannot connect to the MCP server
Verify the binary path in your config is absolute and the binary is executable. Use --mcp-stdio transport for Claude Desktop as it expects stdio communication, not HTTP.
HTTP transport connection refused
Check that no other process is using port 7777. Use --mcp-http-port to change the port, and ensure your firewall allows connections on the chosen port from localhost.
Frequently Asked Questions about Gearsystem
What is Gearsystem?
Gearsystem is a Model Context Protocol (MCP) server that sega master system / game gear / sg-1000 emulator, debugger and embedded mcp server for macos, windows, linux, bsd and retroarch. It connects AI assistants to external tools and data sources through a standardized interface.
How do I install Gearsystem?
Follow the installation instructions on the Gearsystem GitHub repository. Clone the repo, install dependencies, and add the server config to your AI client.
Which AI clients work with Gearsystem?
Gearsystem works with all major MCP-compatible AI clients including Claude Desktop, Claude Code, Cursor, VS Code (GitHub Copilot), Windsurf, and Cline.
Is Gearsystem free to use?
Yes, Gearsystem is open source and available under the GPL-3.0 license. You can use it freely in both personal and commercial projects.
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