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

julie_m · 11th Apr 2021, 7:02 pm

That's exactly what I was expecting to see; and it exonerates UC7, and pushes the blame towards UC9. Pins 12, 13, 14 and 15 are the 8s, 4s, 2s and units of a binary number which is counting up in sequence from 0000 (0) to 1001 (9).

It's probably time to think about ordering a replacement 74LS145 and a high-quality turned pin socket ..... 74HCT145 or 74HC145 probably would substitute fine, if needs must.

11th Apr 2021, 7:02 pm	#1563
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Non-working Commodore PET 3016 That's exactly what I was expecting to see; and it exonerates UC7, and pushes the blame towards UC9. Pins 12, 13, 14 and 15 are the 8s, 4s, 2s and units of a binary number which is counting up in sequence from 0000 (0) to 1001 (9). It's probably time to think about ordering a replacement 74LS145 and a high-quality turned pin socket ..... 74HCT145 or 74HC145 probably would substitute fine, if needs must. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.