Date: 2006-06-08 22:21:38
Hi everybody, I'm trying to repair an PET 2001-8C. When I turn the PET on it displays a lot of garbage on the screen. But just on the 3rd quarter of the screen. It's the same garbage every time. I switched or tested the TTL's in the video circuit but nothing changes. I switched the 6550's main RAM with video RAM but also no change. I switched the 6550 Char ROM with another ROM now there is different garbage on the screen so the ROM is being read. I replaced the 6502 but no change. The PET should display without the 6502 running so I did some test without the 6502 installed. I took some pictures: http://www.xs4all.nl/~lagendr/Diverse/PET 2001.htm I reseated all chips that are in sockets. The video circuit chips are now also in sockets (not the cheap ones.) Is there anybody who has a idea what's wrong with my PET? Greetings Richard Message was sent through the cbm-hackers mailing list
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