GitHub - antirez/c64-hw-simulator: Commodore 64 hardware simulator github.com

Antirez has released c64-hw-sim, an open-source simulator that models the Commodore 64’s ASSY 250407 motherboard and components pin by pin, letting users introduce faults such as removed chips, broken pins, and open resistors. It can help users study the hardware or investigate repair hypotheses, but it runs at only about 31–48% of real speed on the listed modern computers and does not model several analog effects or internal chip faults.