How Commodore Made a Sync Splitter

Recently we featured an unusual Commodore 8-bit computer on the bench of [Tynemouth Software] — a Commodore 64 in a PET case. One of the unique parts it had was a board which took the composite output from the mainboard and split out the sync pulses for the monitor, and now they’re back to give it a full reverse engineer . Perhaps the first surprise is why this board is necessary at all, after all one might expect an 8-bit machine to have those signals already at hand.