UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Non-working Commodore PET 3016

SiriusHardware · 22nd Jan 2021, 2:02 pm

That's useful to have confirmed but I did say earlier that it was not necessary to make the measurements in #203 and #206 - a bit of brain-fade on my part, I thought you had measured a low voltage on RDY, not the high voltage you actually measured.

Focus now on using your scope to look first at the 1MHz output on UG5 pin 7 (which we are sure is there, so it's a good practice target) and then move to 6502 pins 9, 10, 11 (at least) to see if you have any activity on those pins.

22nd Jan 2021, 2:02 pm	#212
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,586	Re: Non-working Commodore PET 3016 That's useful to have confirmed but I did say earlier that it was not necessary to make the measurements in #203 and #206 - a bit of brain-fade on my part, I thought you had measured a low voltage on RDY, not the high voltage you actually measured. Focus now on using your scope to look first at the 1MHz output on UG5 pin 7 (which we are sure is there, so it's a good practice target) and then move to 6502 pins 9, 10, 11 (at least) to see if you have any activity on those pins.