Case Studies in Retro Computer Repair (#12): Diagnosing and Fixing a Commodore 64 with a Previous Kernel ROM Modification

Introduction I purchased this untested English Commodore 64 from a local friend. Unfortunately, it booted to a black screen and hit my desk for repair. Interestingly, it passed all the diagnostic tests and would boot games from cartridge. However, when booting to BASIC it would yield a black screen. Case

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