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Old 15th Apr 2021, 7:54 am   #1665
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,485
Default Re: Non-working Commodore PET 3016

I am hoping that only two of three of the MC3446s s are dud as that BASIC test program employs the interface's ability to read its own output lines and does a fairly comprehensive test on the interface.

Of course it could be the 6520 but the simple way to find out is to temporarily swap the two 6520s to see if that alters the nature of the fault. If not, then we are back to the MC3446s. Cricklewood's price - if they really have them - is not too bad.
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