Re: Nascom repair - Looking for clues please
Looking at the screen shots again the 2 lines of garbage are the same on both pictures so that looks like uninitialized ram content. It looks like the video RAM is being read correctly ( so all the address counters in the video section are working ) but not written to. Also the 2102 memory chips hold 1 bit each so a faulty RAM chip could not produce that pattern.
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