C64 by ChronoCoders
C64 by ChronoCoders is a free emulator for the Commodore 64 and its 1541 disk drive, available for Linux and Windows.
What C64 by ChronoCoders is
C64 by ChronoCoders is a free emulator for the Commodore 64 and its 1541 disk drive, available for Linux and Windows. Written in C11, it models the computer and disk drive as separate machines with independent clock timing connected by an IEC serial bus. The project documents VIC-II graphics modes and sprites, along with SID 6581 sound resampled to 44.1 kHz. It says the emulator runs commercial software, including games verified beyond unit tests. The 1541 model supports LOAD, SAVE, and NEW, and saves disk changes back to a D64 image when the emulator exits cleanly. Controls include keyboard, joystick, and SDL-recognized game controllers, with configurable joystick port and keyboard layout. The GUI binary requires a C11 compiler and SDL2; the documented verified platforms are Linux x86-64 and Windows x86-64 using MSYS2 MinGW64. C64 ROM images are not included, so users must provide legally obtained copies. The repository source uses the MIT License, which does not cover ROMs, disk images, cartridges, or other software used with the emulator. Save-state snapshots are limited to matching platform, build, endianness, and compiler ABI.
Good
- Free emulator for Commodore 64 and 1541
- Models the computer and drive on separate clock domains
- Supports keyboard, joystick, and SDL-recognized controllers
- Writes disk changes back to D64 images on clean exit
- Includes headless operation
Watch out
- C64 ROM images are not included
- GUI build requires a C11 compiler and SDL2
- Verified platforms are Linux x86-64 and Windows x86-64
- Save states require matching platform, build, byte order, and ABI
Who it suits
C64 by ChronoCoders suits users who want to run Commodore 64 software on Linux or Windows and can provide their own ROM images. Its documentation also addresses people extending or porting the code or seeking to understand its behaviour.
Verdict
C64 by ChronoCoders offers detailed C64 and 1541 emulation with D64 disk support. Users need to obtain ROM images themselves, and save states have strict compatibility limits.
The facts
Each one read from C64 by ChronoCoders's own pages, with the date it was checked.
What it does
- Accuracy limits
- The design notes say digital components are modelled to the cycle while the SID filter and mixing use labelled fixed-point approximations.checked 7 Oct 2026
- Audience
- The design notes describe the documentation as intended for people extending or porting the code and people seeking to understand or trust its behaviour.checked 7 Oct 2026
- Audio and graphics
- Its documented features include VIC-II graphics modes and sprites, plus SID 6581 sound resampled to 44.1 kHz.checked 7 Oct 2026
- Build requirements
- The GUI binary requires a C11 compiler and SDL2; the project documents Linux x86-64 and Windows x86-64 using MSYS2 MinGW64 as verified platforms.checked 7 Oct 2026
- Controls
- Keyboard, joystick, and SDL-recognized game controllers are supported, with configurable joystick port and keyboard layout.checked 7 Oct 2026
- CPU and bus
- The C64 and 1541 run in separate clock domains and communicate over a modelled IEC serial bus.checked 7 Oct 2026
- Disk drive
- The 1541 drive supports LOAD, SAVE, and NEW, with disk changes written back to the .d64 file on clean exit.checked 7 Oct 2026
- Disk support
- The 1541 model supports LOAD, SAVE, and NEW, and writes disk changes back to the .d64 file on clean exit.checked 7 Oct 2026
- Graphics
- The VIC-II implementation covers five graphics modes, sprites, collisions, badlines, raster interrupts, and border effects.checked 7 Oct 2026
- Hardware emulation
- It models the C64 and 1541 as separate machines with independent clock domains and a real IEC serial bus.checked 7 Oct 2026
- Headless mode
- The emulator supports a --headless mode and can run without an audio device, pacing to realtime from a wall-clock frame timer.checked 7 Oct 2026
- Input
- Input options include keyboard mapping modes, joystick port switching, cursor-key joystick controls, and SDL-recognized game controllers.checked 7 Oct 2026
- License
- The repository source code is available under the MIT License, which grants use without charge and disclaims warranties.checked 7 Oct 2026
- License limits
- The MIT license covers repository source only; it does not cover ROM images, disk images, cartridges, or other software used with the emulator.checked 7 Oct 2026
- Purpose
- C64 is a cycle-accurate Commodore 64 and 1541 disk-drive emulator written from scratch in C11.checked 7 Oct 2026
- Requirements
- Building requires a C11 compiler and SDL2 for the GUI binary; the project documents Linux x86-64 and Windows x86-64 using MSYS2 MinGW64 as verified platforms.checked 7 Oct 2026
- ROM requirement
- Copyrighted C64 ROM images are not included, so users must provide their own legally obtained copies to run the emulator.checked 7 Oct 2026
- Save states
- Snapshots are limited to the same platform, build, endianness, and compiler ABI.checked 7 Oct 2026
- Snapshots
- Save-state snapshots are limited to the same platform, build, compiler layout, and byte order.checked 7 Oct 2026
- Software compatibility
- The project says it runs commercial software, including real games verified beyond unit tests.checked 7 Oct 2026
- Sound
- The SID 6581 model includes oscillators, four waveforms, sync, ring modulation, ADSR, a multimode filter, and 44.1 kHz resampling.checked 7 Oct 2026
The company
- Maker
- The maker profile identifies Altug Tatlisu and lists New York, US as the location.checked 7 Oct 2026
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