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ajgriff · 12th Oct 2021, 9:59 pm

Excellent and well done to you both. A textbook illustration of how tricky it can be to track down intermittent faults. Have a close look at the pin 4 connector in the JP8 plug as just suggested by Sirius.

I'll probably be even less able to help with the next phase as I'm used to the earlier 2001 with static rather than dynamic RAM. However it would be useful to know the specifics of the RAM in your machine. Are they 4116s and are there two banks of eight?

Alan

12th Oct 2021, 9:59 pm	#62
ajgriff Nonode Join Date: May 2004 Location: Halifax, West Yorkshire, UK. Posts: 2,587	Re: Commodore PET 2001 voltage regulators Excellent and well done to you both. A textbook illustration of how tricky it can be to track down intermittent faults. Have a close look at the pin 4 connector in the JP8 plug as just suggested by Sirius. I'll probably be even less able to help with the next phase as I'm used to the earlier 2001 with static rather than dynamic RAM. However it would be useful to know the specifics of the RAM in your machine. Are they 4116s and are there two banks of eight? Alan