No. 19 of 30 ·Commodore 64 Emulators

zig64

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Freedom report

One barScore 5.3

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedPlans, terms and facts published

zig64 is ranked #19 of 30 in Commodore 64 emulators on Freedom251.

Compared on Commodore 64 emulators

Built-in debugger: Yes

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The record

Product: zig64 is a Commodore 64 MOS 6510 emulator core implemented in Zig.
CPU emulation: It implements documented MOS 6502/6510 instructions and addressing modes with cycle-accurate timing.
Video timing: It synchronizes CPU cycles with PAL and NTSC timings and emulates raster beam behavior and bad lines, without generating video output.
SID analysis: It tracks SID register writes by cycle and decodes changes such as waveforms and envelopes.
Program loading: It can load .prg files directly into memory for execution.
Debugging: It provides step-by-step CPU traces, state inspection, and SID change logging.
Disassembly: Its Asm component decodes 6502/6510 instructions into mnemonics and metadata and supports disassembly.
Testing: The README describes integration with Zig’s testing framework for writing unit tests for C64 code.
Integration: The README documents adding zig64 as a dependency and importing its module into a Zig project.
Related project: The README names zigreSID as a related SID sound emulation library for Zig that integrates with zig64 for .sid playback.
License: The project is released under the MIT License, which the README says allows free modification and distribution.
Build and tests: The README gives `zig build` and `zig build test` commands; its Requirements heading lists no requirements.
Intended users: The README presents the core as a foundation for C64 software analysis, SID player routine inspection, and debugging, aimed at developers and enthusiasts.
Maker information: The repository is published by the GitHub account M64GitHub; the opened project page does not state a headquarters or founding date.

Where it ranks on Freedom251

Best Commodore 64 Emulators in 2026#19 of 30

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Sources

github.com/M64GitHub/zig64· checked 5 Oct 2026