On 10/26/2016 03:00 AM, Clockmeister wrote: > > Whilst mask ROM (and RAM for that matter) failures are common on vintage > equipment, the last two VIC-20's with a black screen that I repaired had > a bad 6561-101. > In my case both were easy to diagnose by simply plugging in a cartridge > or blind loading a game. On both occasions the game you could hear the > game playing even though there was a black screen. While we're at it... Does someone know the difference between the 6561E and the 6561-101? Another common failure in a VIC-20 are the MOS 65245 if they are present on the board in question. They can be replaced with 74LS245. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2016-10-26 09:01:17
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