In this episode Adrian builds Sven Petersens (@svenpetersen191) Commodore Diagnostic Test Harness PCBs. These are used in conjunction with the Commodore Diagnostic ROM 586220 for complete testing of the C64 and most of the C128.
Adiran Black On Building a Commodore 64 Diagnostic Test Harness
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 Commodore Diagnostic Test Harness PCBs.){kind=link}