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Old 16th Mar 2021, 10:36 pm   #1079
ScottishColin
Heptode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 667
Default Re: Non-working Commodore PET 3016

Will do.

I was trying to show the differences between what I thought should be similar readings on UI10 and UI11 - for example:

UI10 2/3 (5V) - 2.16
UI11 2/3 (5V) - 1.67

I'll do them again tomorrow in the order you suggest so we can et a better set of comparisons. Scope readings will also follow.

Colin.


Quote:
Originally Posted by SiriusHardware View Post
Slightly confusing because you have done half of them to +5V and half to 0V, unless I am misunderstanding your results. To clarify:

Measure from +5V (red lead on +5V) to each of

UI10 pins 8-9
UI10 pins 6-7
UI10 pins 4-5
UI10 pins 2-3
UI11 pins 8-9
UI11 pins 6-7
UI11 pins 4-5
UI11 pins 2-3

And report the results, then measure from 0V (black lead on 0V) to each of

UI10 pins 8-9
UI10 pins 6-7
UI10 pins 4-5
UI10 pins 2-3
UI11 pins 8-9
UI11 pins 6-7
UI11 pins 4-5
UI11 pins 2-3

..and report the results.

Regardless of what you find, could you please also do the scope comparison between these eight pin pairs as well. Doesn't have to be tonight, take your time.
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