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  • csc316's Avatar
    August 17th, 2019, 09:01 PM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    Still looking for help with this, but I've made some progress. A few 74LS244 chips have been replaced, as they had rusted through pins. Replaced...
    11 replies | 404 view(s)
  • csc316's Avatar
    August 1st, 2019, 12:57 PM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    My replies don't seem to post. So sorry if this is a duplicate post. Pin 37 shows a decent square wave, shown below. I've got nothing on J7's...
    11 replies | 404 view(s)
  • csc316's Avatar
    July 31st, 2019, 12:58 PM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    Another tidbit of info, I have no voltage on supply pin 24 of UD8. Checking traces now...
    11 replies | 404 view(s)
  • csc316's Avatar
    July 31st, 2019, 11:03 AM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    Nothing on 6502 pin 7 (0V), with or without the chirp.
    11 replies | 404 view(s)
  • csc316's Avatar
    July 31st, 2019, 10:53 AM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    I'm getting 5v constant on pin 3 of J7 (that's the Vsync, right?). Same on pin 5 of J7 (Hsync, right?). That's with or without the rare chirp.
    11 replies | 404 view(s)
  • csc316's Avatar
    July 31st, 2019, 10:37 AM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    Also, regulators are pretty cool, even the -5v one without any heat sink. No chips get hot.
    11 replies | 404 view(s)
  • csc316's Avatar
    July 31st, 2019, 10:35 AM
    csc316 replied to a thread Another dead SuperPET! in Commodore
    My multimeter and scope have always agreed perfectly in the past. But now that you mention it, the three voltage regulators I was using as...
    11 replies | 404 view(s)
  • csc316's Avatar
    July 30th, 2019, 01:01 PM
    Well, you very helpful folks appear to like a challenge with these things. So here's me begging for help! The story so far: Purchased a dead...
    11 replies | 404 view(s)
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