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Old 13th Mar 2021, 1:26 pm   #1009
ScottishColin
Octode
 
Join Date: May 2012
Location: Perth, Scotland
Posts: 1,804
Default Re: Non-working Commodore PET 3016

For the record, no IC in UF9 = checkboard (that wanders a bit as per my previous post).

New UF9 = solid checkerboard

Old UF9 = inverse @ sign.

Colin.


Quote:
Originally Posted by ajgriff View Post
Quote:
Originally Posted by SiriusHardware View Post
The intermittent / unpredictable effects seen were all with the original UF9 (suspected faulty) fitted or with no UF9 fitted. Since a new UF9 device was fitted I think the output has been constant chequerboard ....
Fair comment and I think you're right. However, it does seem strange that when the old UF9 was refittted the @s emerged. Also at one point earlier (before UF9s removal) Colin detected the ; code. Perhaps these anomalies were indeed caused by a faulty UF9. Difficult to be sure.

Alan
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