Posted By
Muzer
on 2021-02-03
15:15:05
|  Re: Plus/4 black screen diagnosis (not CPU/TED/PLA)
Ran the test today, seems like one of the bits is buggered; screen was alternating between the checkerboard and "D" rather than checkerboard and "@". However leaving it running for a while partway through some seemingly-random areas of the screen changed to displaying "?" and the horizontal line graphics character (not entirely sure which one). Ordered a complete set of new RAM chips in case there's more than one having problems, in that case.
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