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Breadbin466
What it is
Breadbin466 is a free Commodore 64 emulator written from scratch in Rust, focused on accurately modeling one PAL Assy 250466 machine. Its cycle-driven emulation covers the MOS 6510 CPU and VIC-II video timing, generation, and bus arbitration. The MOS 6581R4AR sound model draws on characterization of a physical chip, while the cycle-driven 1541 drive includes its own CPU, mechanics, GCR read channel, IEC communication, fastloaders, and protected-disk behavior. Other emulated hardware includes CIA interfaces and timers, a 1351 mouse, a 1530 Datassette with TAP playback and recording, cartridges, and a 512 KB REU. It reads D64, G64, NIB, NBZ, and D7Z disk images, with tools to create, convert, and reclaim space in images. The integrated debugger offers breakpoints, disassembly, history, and configurable tracing. It also lists PCM WAV capture and command-line automation. Native menus and Inspector windows are available across macOS, Windows, and Linux. Version 0.99.0 is described as feature-complete, with wider testing still needed before 1.0.
For and against
For
- Models a specific PAL Assy 250466 machine.
- Supports five disk-image formats, including D7Z.
- Includes an integrated debugger and tracing.
- Runs on macOS, Windows, and Linux.
- Free plan; emulator licensed under MIT.
Against
- Version 0.99.0 still needs broader testing before 1.0.
- Linux support is through source builds.
- Commodore ROM images are excluded from the MIT license.
The verdict
Breadbin466 combines detailed C64 hardware emulation with disk-image tools, audio capture, and debugging. The project describes version 0.99.0 as feature-complete, while noting broader testing remains before 1.0.
Who it suits
Breadbin466 suits people looking to run software for a PAL Assy 250466 C64 model, or work with its disk images and emulated hardware. Its debugger and command-line automation may also suit users who need to inspect or characterize sessions.
Plans and prices
Breadbin466
MIT-licensed emulator · Commodore ROM images are not covered by the MIT License
Read 29 Sep 2026 · github.com
On the record
- Audio capture
- The project lists session-long PCM WAV audio capture and command-line automation facilities for testing and characterisation.github.com · read 29 Sep 2026
- Availability
- The repository says macOS and Windows builds are available through release downloads and Linux is supported through source builds.github.com · read 29 Sep 2026
- CPU and video
- It emulates a cycle-driven MOS 6510 CPU and VIC-II raster timing, video generation, and bus arbitration.github.com · read 29 Sep 2026
- Debugging
- The integrated debugger includes breakpoints, disassembly, history, and configurable execution, read, and write tracing.github.com · read 29 Sep 2026
- Desktop features
- Native menus and Inspector windows are provided on macOS, Windows, and Linux, with fixed-refresh display pacing and 44.1 kHz audio preferred.github.com · read 29 Sep 2026
- Disk drive
- The cycle-driven Commodore 1541 emulation includes its own CPU, VIAs, mechanics, GCR read channel, IEC communication, fastloaders, and protected disk behavior.github.com · read 29 Sep 2026
- 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.github.com · read 29 Sep 2026
- License
- The emulator is licensed under MIT, while the Commodore ROM images distributed with it are explicitly excluded from that license.github.com · read 29 Sep 2026
- Other hardware
- Features include CIA timers and interfaces, a 1351 proportional mouse, a 1530 Datassette with TAP playback and recording, cartridges, and a 1764 REU with 512 KB.github.com · read 29 Sep 2026
- Project status
- Version 0.99.0 is described as feature-complete and ready for community testing, with broader testing remaining before 1.0.github.com · read 29 Sep 2026
- Purpose
- Breadbin466 is a from-scratch Commodore 64 emulator written in Rust that focuses on accurately modeling one PAL Assy 250466 machine.github.com · read 29 Sep 2026
- Sound
- Its MOS 6581R4AR SID model is based on characterisation of a physical datecode 2286 chip and models oscillator, DAC, mixing, and filter behavior.github.com · read 29 Sep 2026
- Support
- Users can send feedback to [email protected] or report reproducible problems through GitHub Issues.github.com · read 29 Sep 2026