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

SiriusHardware · 18th Mar 2021, 8:18 pm

Well, that's still interesting despite the brief diversion as it means we really don't have a BANK SEL signal.

If you could now please scope the input pins on UB2 pins 9, 10,12,13 and let us see what's there? Ideally we need a 3-input scope at this point, but never mind.

Can you capture:-

UB2 pin 9 (channel 1) and UB2 pin 10 (channel 2)

UB2 pin 9 (channel 1) and UB2 pin 12 (channel 2)

UB2 pin 9 (channel 1) and UB2 pin 13 (channel 2)

Try to get at least one complete cycle of the pin 9 waveform on the screen in each case.

18th Mar 2021, 8:18 pm	#1165
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,560	Re: Non-working Commodore PET 3016 Well, that's still interesting despite the brief diversion as it means we really don't have a BANK SEL signal. If you could now please scope the input pins on UB2 pins 9, 10,12,13 and let us see what's there? Ideally we need a 3-input scope at this point, but never mind. Can you capture:- UB2 pin 9 (channel 1) and UB2 pin 10 (channel 2) UB2 pin 9 (channel 1) and UB2 pin 12 (channel 2) UB2 pin 9 (channel 1) and UB2 pin 13 (channel 2) Try to get at least one complete cycle of the pin 9 waveform on the screen in each case.