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

julie_m · 11th Apr 2021, 9:11 am

If you get desperate to do those measurements, each of the pins of UC9 under test will need one end of a 10K resistor connected to it; with the other end connected to UC9 pin 16 or any other convenient +5V pin.

Also, I think UC9 pin 8 is actually 0V; so the last three tests probably should be comparing pins 7 and 9, pins 9 and 10 and pins 10 and 11 respectively.

11th Apr 2021, 9:11 am	#1550
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Non-working Commodore PET 3016 If you get desperate to do those measurements, each of the pins of UC9 under test will need one end of a 10K resistor connected to it; with the other end connected to UC9 pin 16 or any other convenient +5V pin. Also, I think UC9 pin 8 is actually 0V; so the last three tests probably should be comparing pins 7 and 9, pins 9 and 10 and pins 10 and 11 respectively. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.