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

SiriusHardware · 17th Mar 2021, 9:03 pm

I have to be honest, nothing is really jumping out at me there.

Can you try scoping the BD0... BD7 lines, you can find them on the first of each of these pairs of connected pins.

UI10 pins 11-12
UI10 pins 13-14
UI10 pins 15-16
UI10 pins 17-18

UI11 pins 11-12
UI11 pins 13-14
UI11 pins 15-16
UI11 pins 17-18

Also scope Pin 3 of each of the 4108s and pins 4 and 15 of each 4108 as well. No need to post those results, just confirm that all of them have activity on them with proper high / low logic levels.

17th Mar 2021, 9:03 pm	#1108
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,558	Re: Non-working Commodore PET 3016 I have to be honest, nothing is really jumping out at me there. Can you try scoping the BD0... BD7 lines, you can find them on the first of each of these pairs of connected pins. UI10 pins 11-12 UI10 pins 13-14 UI10 pins 15-16 UI10 pins 17-18 UI11 pins 11-12 UI11 pins 13-14 UI11 pins 15-16 UI11 pins 17-18 Also scope Pin 3 of each of the 4108s and pins 4 and 15 of each 4108 as well. No need to post those results, just confirm that all of them have activity on them with proper high / low logic levels.