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

SiriusHardware · 3rd Mar 2021, 11:44 pm

OK, it was possible that the 16MHz output from UG1 (6) was genuinely weak and, although able to drive UG5, not able to drive UH3.

If it looks the same back on UI1 (4) then it is probably just your scope not quite able to show the square shape of the 16MHz signal.

Unfortunately this throws it back in the direction of UH3 being faulty, unless anyone else has any ideas? If UH3 was in a socket / removable you could write a little sketch to test it using your Arduino, but I imagine it is soldered.

3rd Mar 2021, 11:44 pm	#787
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,556	Re: Non-working Commodore PET 3016 OK, it was possible that the 16MHz output from UG1 (6) was genuinely weak and, although able to drive UG5, not able to drive UH3. If it looks the same back on UI1 (4) then it is probably just your scope not quite able to show the square shape of the 16MHz signal. Unfortunately this throws it back in the direction of UH3 being faulty, unless anyone else has any ideas? If UH3 was in a socket / removable you could write a little sketch to test it using your Arduino, but I imagine it is soldered.