TRX64

What it does

API

The public control interface is JSON-RPC 2.0 over WebSocket.checked 15 Oct 2026

Architecture

The project provides a daemon and JSON-RPC API with multiple front ends sharing one emulated machine per process.checked 15 Oct 2026

Cartridges

Supported cartridge formats include generic 8K/16K/Ultimax, Ocean, Magic Desk, EasyFlash, GMod2, GMod4, MegaByter and C64MegaCart.checked 15 Oct 2026

Checkpoints

Full-machine checkpoints support scrubbing and read-only diffs between saved points.checked 15 Oct 2026

CLI cockpit

trx64cli combines a terminal cockpit with an optional native emulator window.checked 15 Oct 2026

Debugging

It provides rewind, byte-exact reverse stepping, write tracking, observers, traces, marks, and sandboxes for reverse engineering.checked 9 Oct 2026

Disk formats

The emulator supports D64 and G64 images in 1541 drives and D81 images in 1581 drives.checked 15 Oct 2026

Documentation

The repository includes a README, a 228-line monitor reference and a separate CLI README.checked 15 Oct 2026

Downloads

The releases page provides prebuilt assets for Linux, macOS, and Windows, including x86_64 and arm64 builds where listed.checked 9 Oct 2026

Expansion hardware

REU, GeoRAM and Ultimate Command Interface devices are supported.checked 15 Oct 2026

Extensibility

Hosts can attach custom IEC devices and disk controllers through documented Rust interfaces.checked 15 Oct 2026

Headless operation

The daemon can run headlessly and advances only when explicitly commanded.checked 15 Oct 2026

Independent report: automation

The announcement says TRX64 can run in Docker for automated testing or locally from the command line.checked 15 Oct 2026

Independent report: implementation

A Lemon64 announcement describes TRX64 as a Rust runtime intended to be broadly comparable with VICE.checked 15 Oct 2026

Independent report: input limitation

The maker stated in the forum announcement that only keyboard and keyboard-as-joystick input were implemented, with no operating-system joystick or mouse support planned.checked 15 Oct 2026

Independent report: media

The same announcement lists D64, G64 and CRT support and describes the 1541 as a true-drive emulation.checked 15 Oct 2026

Independent report: reverse buffer

The announcement describes a default ten-second ring buffer for stepping backward and rerunning code.checked 15 Oct 2026

Installation

Prebuilt archives target macOS, Linux and Windows on x86_64 and arm64; Homebrew and cargo source builds are also documented.checked 15 Oct 2026

Install options

The README documents installation through Homebrew and building from source with cargo build --release.checked 9 Oct 2026

Integrations

TRX64 is described as the runtime backend for C64RE and the C64U / UE2 Emulator, and it offers a typed UniFFI library with Swift bindings.checked 9 Oct 2026

Interfaces

The project offers trx64cli, a terminal cockpit with an optional native emulator window, and C64RE, a browser-based reverse-engineering workbench.checked 9 Oct 2026

Licence

The project is licensed under GPL-3.0-or-later and says its emulation cores derive from VICE under GPL-2.0-or-later.checked 15 Oct 2026

License

The project is licensed under GPL-3.0-or-later.checked 9 Oct 2026

Limit: incomplete replacement

The maker stated that TRX64 supports only a defined subset of C64 emulation and is not a full replacement for a real Ultimate 64.checked 15 Oct 2026