Break a virtual Commodore 64 to understand the real board

This Commodore 64 simulator models chips and their connected pins, letting you remove components, short pins and inspect signals without damaging a board. It can help compare a fault hypothesis with visible symptoms. That match is only a clue: analog behavior is approximate and several fault types are absent. Pin-level simulation also runs below real time, so this is a learning and repair aid.

antirez

Why it matters

Fault injection makes otherwise hidden hardware relationships observable.

More context

Try the source build on macOS or Linux with OpenGL. The project supports reproducible seeded behavior and headless fault runs. Treat this as a project discovery; its original release date was not established.

Keep in mind

Power and floating-line constants are approximations, and matching symptoms do not identify a failed chip conclusively.

Original read