frntc

Sidekick64. Sidekick64: A Versatile Software-Defined Cartridge for the C64, C128, C16, plus/4, and VIC20

SIDKick-pico. SIDKick pico is an inexpensive dual-SID-replacement for the C64 and C128

RAD. RAD Expansion Unit for C64/C128

SIDKick. SIDKick -- the first complete SID 6581/8580-drop-in-replacement that you can build yourself

RAD-Doom. RAD-Doom (Doom on C64/C128 using the RAD Expansion Unit)

RasPIC64. Framework for bidirectional communication between a Raspberry Pi 3B/3B+ and a Commodore 64