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Old 24th Feb 2021, 7:08 pm   #657
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,817
Default Re: Non-working Commodore PET 3016

When you say right hand side, do you mean (for example) pin 18 on UC3 and all others on the right hand side of the attached schematic?

Thanks.

Colin.


Quote:
Originally Posted by SiriusHardware View Post
No problem using the scope to measure frequency (I had not realised it had that feature).

In addiction to Marks's suggestion re: The chip selects, repeat the same address line process but this time looking at the buffered address lines BA0 to BA15 on the right hand side of UC3 / UB3.

Scope them to make sure the size and appearance is as expected and also that the frequencies mirror those of the CPU A0-A15 lines.
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