Breadbin466 vs TRX64
Breadbin466
github.comTRX64
github.comSide by side
| Figure | Breadbin466 | TRX64 |
|---|---|---|
| Price from | Free | Free |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | — | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| API | — | Yes |
| Self-hosted | — | Yes |
| Plans published | 1 | 2 |
| Spec score · Commodore 64 Emulators | 8.0 (#7) | 8.4 (#2) |
| Debugging | The integrated debugger includes breakpoints, disassembly, history, and configurable execution, read, and write tracing. | It provides rewind, byte-exact reverse stepping, write tracking, observers, traces, marks, and sandboxes for reverse engineering. |
| Disk formats | It supports D64, G64, NIB, NBZ, and the project's open D7Z disk-image format, plus disk-image creation, conversion, and space-reclamation tools. | The emulator supports D64 and G64 images in 1541 drives and D81 images in 1581 drives. |
| License | The emulator is licensed under MIT, while the Commodore ROM images distributed with it are explicitly excluded from that license. | The project is licensed under GPL-3.0-or-later. |
| Purpose | Breadbin466 is a from-scratch Commodore 64 emulator written in Rust that focuses on accurately modeling one PAL Assy 250466 machine. | TRX64 is a cycle-accurate Commodore 64, 1541, and 1581 emulation runtime written in Rust. |
| Support | Users can send feedback to [email protected] or report reproducible problems through GitHub Issues. | The maker directs users to GitHub issues and says they cannot provide real support. |
Plans
In their own words
Breadbin466
Breadbin466 is a free Commodore 64 emulator written in Rust, focused on modeling one PAL Assy 250466 machine. Its cycle-driven emulation covers the MOS 6510 CPU and VIC-II video timing and generation, including bus arbitration. The SID sound model draws on a physical datecode 2286 chip and models oscillator, DAC, mixing, and filter behavior. Its Commodore 1541 drive emulation includes a separate CPU, VIAs, mechanics, GCR read channel, IEC communication, fastloaders, and protected-disk behavior. Other modeled hardware includes CIA interfaces, a 1351 proportional mouse, a Datassette with TAP playback and recording, cartridges, and a 512 KB REU. It supports D64, G64, NIB, NBZ, and D7Z disk images, with tools for image creation, conversion, and space reclamation. The integrated debugger provides breakpoints, disassembly, history, and configurable tracing. Native menus and Inspector windows are provided on macOS, Windows, and Linux. Version 0.99.0 is described as feature-complete, with broader testing still remaining before 1.0.
TRX64
TRX64 is a free, open-source Rust runtime for cycle-accurate emulation of the Commodore 64, 1541, and 1581. Its reverse-engineering tools include rewind, byte-exact reverse stepping, write tracking, observers, traces, marks, and sandboxes. A daemon exposes JSON-RPC 2.0 over WebSocket, with project capabilities available through JSON-RPC methods. Users can work with trx64cli, a terminal cockpit with an optional native emulator window, or C64RE, a browser-based reverse-engineering workbench. The daemon supports c64, u64, and 128 machine selections, with PAL and NTSC C64 models documented. Media and hardware support includes D64/G64 disks in 1541 drives, D81 disks in 1581 drives, cartridge types, REU, GeoRAM, and the Ultimate Command Interface. It also supports machine snapshots, reverse-debug buffers, trace logs, and VICE .vsf snapshot conversion. Releases are available for Linux, macOS, and Windows, with builds for x86_64 and arm64 where listed. C64 ROMs, including the 1581 DOS ROM, are not included and must be supplied separately.