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Old 11th Mar 2021, 4:46 pm   #908
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,484
Default Re: Non-working Commodore PET 3016

It's OK for pin 12 to be the odd man out on the output side because, while most of the outputs go to the character generator UF10 that output goes to UG9.

The static signals on SD0-SD7 aren't so welcome, though.

If possible can you do a scope capture of the signals on UF8 pins 5 and 6, one above the other so we can see them both together and the relationship between them? Ideally we want about 10 to 16 cycles of the pin 5 signal and whatever the pin 6 signal looks like at the same time.

When you've got that can you also do a similar dual capture with UF9 socket pin 11 (Video Latch) on the upper trace, again about 10 to 16 cycles of that, and UF8 pin 5 on the lower trace?

And just to confirm, when you said

Quote:
All high at 4.14V (checked with a meter). No waveform.
..that included the RAM (UF7 and UF8) pin 10s as well?
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