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Old 4th Feb 2021, 8:07 pm   #465
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,822
Default Re: Non-working Commodore PET 3016

Quote:
Originally Posted by SiriusHardware View Post
Back in Data Buffer Land, your pairs of pins for scope comparison are:

UE9
2,18
4,16
6,14
8,12

UE10
2,18
4,16
6,14
8,12

We appreciate you can only do this when you have your extra hands available.
I didn't need to trouble the third hand - the only pins I get a discernible square wave from are pins 1 and 19 of both UE9 and UE10. All others give no reading (with the exception of pin 10 which gives a strange non-square reading on both ICs).

Colin.
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