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Old 26th Feb 2021, 8:06 pm   #692
Join Date: May 2012
Location: Perth, Scotland
Posts: 667
Default Re: Non-working Commodore PET 3016

Do you mean connect a 4.7k resistor to pin20 of UD9 to a nearby 5V (eg pin 24 of UD9)?


Originally Posted by Mark1960 View Post
If you still see the halfway signals on UE9-2, try connecting a 4.7 k resistor as pullup to nearby 5v. This will hopefully show if that halfway signal is floating or being driven in opposite directions by two different outputs.
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