Emulator for Ultimate 64 Elite II / C64 Ultimate firmware (UI, services, TRX64 as C64) — develop and test firmware, including a mcp server
Run the firmware of the Ultimate 64 Elite II and the C64 Ultimate on your computer, and develop and test it without flashing a device.
The Commodore C64 Ultimate firmware 1.1.0 runs as well:
The emulator runs the application part of the firmware unmodified: ultimate.elf, or the application inside a .ue2 update file. That is where the menu, file browser, REST API and web UI come from. The FPGA part of the firmware does not run; the emulator models the hardware the application talks to instead: flash, SD card, USB, network and the menu overlay. The C64 core is replaced by TRX64 behind the same register interface, with SID sound, cartridges and a 1541 drive. An MCP server lets Claude Code sessions start and drive emulator instances for automated tests.
To build from source, see docs/status/install.md. macOS is the main platform. Linux builds and passes CI but has not been used in practice. Windows is not supported.
Firmware and ROMs are not included. You need:
- a firmware image: your own ultimate.elf build or an update.ue2 file - the roms folder of a 1541ultimate checkout, for the menu font and the C64 ROMs
With --net user the web UI is at http://127.0.0.1:8080. ue2emu run --help lists all options. They can also go into a TOML file, started with ue2emu run --config my.toml (example).
- Usage: build, options, config files, install, ROMs, MCP server - Status: what works, by area - Architecture
From the project README.
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