C64 Bridge is a comprehensive, well-documented community open-source MCP server (GPL-2.0, npm package c64bridge, v1.0.2) that connects AI clients to C64 Ultimate / Ultimate 64, U2-family cartridges, and VICE through 17 grouped tools covering programming, memory, graphics, audio, storage, printing, and knowledge retrieval. It is not an official Commodore product but is listed in the Official MCP Registry and ships extensive LLM-facing safety and knowledge resources, making it a strong fit for serious C64 retro developers; it is unsuitable without matching hardware or an emulator.
C64 Bridge is an MCP server built on the official TypeScript @modelcontextprotocol/sdk that gives an AI agent one place to drive a Commodore 64 environment. It targets C64 Ultimate, Ultimate 64, U2-family cartridges (U2/U2+/U2+L), and the VICE emulator, with runtime backend switching via c64_select_backend. It exposes 17 grouped tools, 27 resources (covering BASIC, 6510 assembly, SID, VIC-II, memory maps, KERNAL, printers, and more), and 10 prompts for running BASIC and assembly programs, reading and writing memory, rendering PETSCII graphics and sprites, playing and composing SID music, managing disks and drives, controlling printers, and optional RAG knowledge retrieval. The server communicates over stdio, with an optional HTTP bridge intended only for manual inspection.
Requires Node.js 24+ and npm. Start with npx -y c64bridge@latest. In your MCP client config (e.g., .vscode/mcp.), add a server entry with command npx and args ["-y","c64bridge@latest"], optionally setting env vars such as C64_MODE (c64u/u2/vice), C64U_HOST, C64U_PORT, C64U_PASSWORD, VICE_BINARY, VICE_VISIBLE, and VICE_WARP. Backend configuration can also be provided via the JSON file pointed to by C64BRIDGE_CONFIG (default ~/.c64bridge.).
{"servers":{"c64bridge":{"command":"npx","args":["-y","c64bridge@latest"]}}}