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

SiriusHardware · 13th Jan 2021, 1:17 pm

Here you go:-

https://www.cricklewoodelectronics.com/74191.html

However, I would make an enquiry with them to see if their ICs really are 'original' 74191 and not 74(something)191. If the one actually fitted in UG5 position is already a 74LS type then by all means just find and fit one of those.

If Cricklewood's ICs really are 74191 at that price I suggest you buy at least two, one to keep as a spare, as there is no telling how much longer 'original' TTL ICs will continue to be available for.

Before you do any of this, check one more time to see whether you do or do not have 1MHz out on UG5 pin 7. (With the power on, obviously). The there / not there nature of that fault worries me a little bit.

13th Jan 2021, 1:17 pm	#103
SiriusHardware Dekatron Join Date: Aug 2011 Location: Newcastle, Tyne and Wear, UK. Posts: 11,575	Re: Non-working Commodore PET 3016 Here you go:- https://www.cricklewoodelectronics.com/74191.html However, I would make an enquiry with them to see if their ICs really are 'original' 74191 and not 74(something)191. If the one actually fitted in UG5 position is already a 74LS type then by all means just find and fit one of those. If Cricklewood's ICs really are 74191 at that price I suggest you buy at least two, one to keep as a spare, as there is no telling how much longer 'original' TTL ICs will continue to be available for. Before you do any of this, check one more time to see whether you do or do not have 1MHz out on UG5 pin 7. (With the power on, obviously). The there / not there nature of that fault worries me a little bit.