C64 Bridge

io.github.chrisgleissner/c64bridge · v1.1.0

MCP server for Commodore 64 Ultimate hardware and VICE emulator control.

Website Source code Set it up

Connect Runs on your machine

Terminal

claude mcp add c64bridge -e LOG_LEVEL=<LOG_LEVEL> -e C64BRIDGE_CONFIG=<C64BRIDGE_CONFIG> -e C64BRIDGE_ALLOWED_DIRS=<C64BRIDGE_ALLOWED_DIRS> -e C64BRIDGE_ACCESS=<C64BRIDGE_ACCESS> -e C64BRIDGE_HTTP_TOKEN=<C64BRIDGE_HTTP_TOKEN> -e C64BRIDGE_DIAGNOSTICS_KEEP=<C64BRIDGE_DIAGNOSTICS_KEEP> -e C64BRIDGE_VERBOSE_SCHEMA=<C64BRIDGE_VERBOSE_SCHEMA> -e C64_MODE=<C64_MODE> -e C64U_HOST=<C64U_HOST> -e C64U_PORT=<C64U_PORT> -e C64U_PASSWORD=<C64U_PASSWORD> -e U2_HOST=<U2_HOST> -e U2_PORT=<U2_PORT> -e U2_PASSWORD=<U2_PASSWORD> -e VICE_BINARY=<VICE_BINARY> -e VICE_VISIBLE=<VICE_VISIBLE> -e VICE_WARP=<VICE_WARP> -e GITHUB_TOKEN=<GITHUB_TOKEN> -- npx -y [email protected]

claude_desktop_config.json

{
  "mcpServers": {
    "c64bridge": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "LOG_LEVEL": "<LOG_LEVEL>",
        "C64BRIDGE_CONFIG": "<C64BRIDGE_CONFIG>",
        "C64BRIDGE_ALLOWED_DIRS": "<C64BRIDGE_ALLOWED_DIRS>",
        "C64BRIDGE_ACCESS": "<C64BRIDGE_ACCESS>",
        "C64BRIDGE_HTTP_TOKEN": "<C64BRIDGE_HTTP_TOKEN>",
        "C64BRIDGE_DIAGNOSTICS_KEEP": "<C64BRIDGE_DIAGNOSTICS_KEEP>",
        "C64BRIDGE_VERBOSE_SCHEMA": "<C64BRIDGE_VERBOSE_SCHEMA>",
        "C64_MODE": "<C64_MODE>",
        "C64U_HOST": "<C64U_HOST>",
        "C64U_PORT": "<C64U_PORT>",
        "C64U_PASSWORD": "<C64U_PASSWORD>",
        "U2_HOST": "<U2_HOST>",
        "U2_PORT": "<U2_PORT>",
        "U2_PASSWORD": "<U2_PASSWORD>",
        "VICE_BINARY": "<VICE_BINARY>",
        "VICE_VISIBLE": "<VICE_VISIBLE>",
        "VICE_WARP": "<VICE_WARP>",
        "GITHUB_TOKEN": "<GITHUB_TOKEN>"
      }
    }
  }
}

~/.cursor/mcp.json

{
  "mcpServers": {
    "c64bridge": {
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "LOG_LEVEL": "<LOG_LEVEL>",
        "C64BRIDGE_CONFIG": "<C64BRIDGE_CONFIG>",
        "C64BRIDGE_ALLOWED_DIRS": "<C64BRIDGE_ALLOWED_DIRS>",
        "C64BRIDGE_ACCESS": "<C64BRIDGE_ACCESS>",
        "C64BRIDGE_HTTP_TOKEN": "<C64BRIDGE_HTTP_TOKEN>",
        "C64BRIDGE_DIAGNOSTICS_KEEP": "<C64BRIDGE_DIAGNOSTICS_KEEP>",
        "C64BRIDGE_VERBOSE_SCHEMA": "<C64BRIDGE_VERBOSE_SCHEMA>",
        "C64_MODE": "<C64_MODE>",
        "C64U_HOST": "<C64U_HOST>",
        "C64U_PORT": "<C64U_PORT>",
        "C64U_PASSWORD": "<C64U_PASSWORD>",
        "U2_HOST": "<U2_HOST>",
        "U2_PORT": "<U2_PORT>",
        "U2_PASSWORD": "<U2_PASSWORD>",
        "VICE_BINARY": "<VICE_BINARY>",
        "VICE_VISIBLE": "<VICE_VISIBLE>",
        "VICE_WARP": "<VICE_WARP>",
        "GITHUB_TOKEN": "<GITHUB_TOKEN>"
      }
    }
  }
}

.vscode/mcp.json

{
  "servers": {
    "c64bridge": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "[email protected]"
      ],
      "env": {
        "LOG_LEVEL": "<LOG_LEVEL>",
        "C64BRIDGE_CONFIG": "<C64BRIDGE_CONFIG>",
        "C64BRIDGE_ALLOWED_DIRS": "<C64BRIDGE_ALLOWED_DIRS>",
        "C64BRIDGE_ACCESS": "<C64BRIDGE_ACCESS>",
        "C64BRIDGE_HTTP_TOKEN": "<C64BRIDGE_HTTP_TOKEN>",
        "C64BRIDGE_DIAGNOSTICS_KEEP": "<C64BRIDGE_DIAGNOSTICS_KEEP>",
        "C64BRIDGE_VERBOSE_SCHEMA": "<C64BRIDGE_VERBOSE_SCHEMA>",
        "C64_MODE": "<C64_MODE>",
        "C64U_HOST": "<C64U_HOST>",
        "C64U_PORT": "<C64U_PORT>",
        "C64U_PASSWORD": "<C64U_PASSWORD>",
        "U2_HOST": "<U2_HOST>",
        "U2_PORT": "<U2_PORT>",
        "U2_PASSWORD": "<U2_PASSWORD>",
        "VICE_BINARY": "<VICE_BINARY>",
        "VICE_VISIBLE": "<VICE_VISIBLE>",
        "VICE_WARP": "<VICE_WARP>",
        "GITHUB_TOKEN": "<GITHUB_TOKEN>"
      }
    }
  }
}

Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.

Tools

This server runs locally, so its tools are listed by your MCP client once it starts.

Environment variables

Name	Description
`LOG_LEVEL` Optional	Logger verbosity.
`C64BRIDGE_CONFIG` Optional	Path to the C64 Bridge configuration file.
`C64BRIDGE_ALLOWED_DIRS` Optional	Additional directories allowed for host file paths in tool arguments, separated by the path delimiter; * disables the check.
`C64BRIDGE_ACCESS` Optional	Access mode limiting which operations may be called.
`C64BRIDGE_HTTP_TOKEN` Optional, secret	Bearer token required by the optional HTTP transport.
`C64BRIDGE_DIAGNOSTICS_KEEP` Optional	Number of diagnostics files kept at startup (files older than 30 days are always removed).
`C64BRIDGE_VERBOSE_SCHEMA` Optional	Set to 1 to include full per-operation schemas in tools/list.
`C64_MODE` Optional	Active backend (c64u/U64 hardware, u2/U2-family cartridge, or vice emulator).
`C64U_HOST` Optional	Ultimate 64 host name or IP address.
`C64U_PORT` Optional	Ultimate 64 REST port.
`C64U_PASSWORD` Optional, secret	Ultimate 64 network password sent as X-Password.
`U2_HOST` Optional	U2/U2+/U2+L host name or IP address when C64_MODE=u2.
`U2_PORT` Optional	U2-family REST port when C64_MODE=u2.
`U2_PASSWORD` Optional, secret	U2-family network password sent as X-Password.
`VICE_BINARY` Optional	VICE emulator binary to launch.
`VICE_VISIBLE` Optional	Launch VICE with a visible window when possible.
`VICE_WARP` Optional	Enable VICE warp mode.
`GITHUB_TOKEN` Optional, secret	GitHub token for optional RAG discovery against GitHub.

Details

Package	`[email protected]` (NPM, stdio)
First published	13 Nov 2026
Last updated	13 Nov 2026
Registry name	`io.github.chrisgleissner/c64bridge`

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Installed and run on your own machine, so there is no public endpoint to check.

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