Best-selling home computer. Cartridge, IEC, SID, and video replacements are a mature open-hardware scene.
Also known as: C64, C64C, SX-64
Published open-source PCB projects
Open source · MIT ESP32 SIDView
Open ESP32 interface board for visualizing and experimenting with SID audio.
Open source · GPL-3.0-only GenAssister Genesis controller adapter
Open adapter for safely using Sega Genesis controllers on Commodore systems.
Open source · GPL-3.0-only PLAster64
Open programmable logic replacement for the Commodore 64 PLA.
Other catalogued projects
| Mod | License | Notes |
|---|---|---|
| Kung Fu Flash | Open source (GPL-3.0-or-later) | Open STM32 cartridge that loads CRT/PRG/SID files from SD and replaces many classic carts. |
| 1541 Ultimate II+ | Mixed / partial source | IEC/cartridge emulator. VHDL and tools have public trees; assembled units are commercial. |
| Ultimate 64 | Mixed / partial source | FPGA C64 motherboard sold as a drop-in. Gateware licensing is mixed. |
| EasyFlash 3 | Open source (GPL-3.0-or-later) | Open-ish flash cartridge platform used by many CRT releases. |
| OpenC64Cart | Open source | Open KiCad cartridge PCB for Commodore 64 homebrew and flash carts. Drop-in C64 expansion-port board. |
| C64 flash cartridge | Open source (CERN-OHL-1.2) | Open rewritable Commodore 64 game cartridge compatible with the Universal Mega Dumper. |
| SIDKick | Open source | Open-source drop-in MOS 6581/8580 SID replacement. FPGA/MCU based; plays SID tunes on original C64 hardware. |
| SIDKick-pico | Open source | Open RP2040 SID replacement by the SIDKick author. Smaller, cheaper successor to the original SIDKick. |
| Tapuino | Open source | Open Arduino-based C64 tape emulator. Loads TAP files from SD in place of a Datasette. |
| Turbo Chameleon 64 | Proprietary | Commercial FPGA cartridge with C64/C64DTV extras. |
Browse these projects in the 3D PCB mod directory. Open-source rows can be shallow-cloned into the git bucket. Generated board renders belong on the artifact CDN, not in git. See the catalog wiki note.