On Tue, Apr 18, 2017 at 1:20 PM, <email@example.com> wrote: > >> On 2017-04-18, at 13:05, Francesco Messineo <firstname.lastname@example.org> wrote: >> >> Hi all, >> I have found a real tricky fault on my C64C. I'll try to describe the >> symptoms, in case anyone is curious enough to help in troubleshooting >> it. I am not a newbie in repairing C64s, but this one made me just >> wondering without even giving me a clue on where to start probing for >> possible faults (if I had a logic analyzer I would know what to do, >> but I haven't got one). > > Logic analysers may not help in some edge cases like this one. > > The nouns you mention (VSP, sprites, ..) seem to be pointing towards the VIC. I'd check its voltages, frequencies and eventually swap it. no VSP errors showed from a tool that's supposed to check for their existence on a C64, so yes, the VSP was mentioned and likely excluded. The crashes are very repeatable infacts, all happens every time at the same point of some programs. Most (all I could try) programs show no random or repeatable errors. I don't have any other MOS 8565 VIC-II chip to try swapping it. I only have old 6569s Thanks Frank Message was sent through the cbm-hackers mailing listReceived on 2017-04-18 12:02:04
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