Posted By
TLC
on 2010-10-14
11:54:22
|  Re: Partially Functional PLUS/4
Your machine doesn't appear to be "very" sick (...if such distinction is applicable for a case like that :-D )... the problem should be related to what you've already found (did you mean U12?... that's indeed a ram chip), or some other damage around there.
And like you suspected, after that many years (AFAIK they stopped producing the machines around 1986) sometimes the ic sockets can also be blamed (the CPU, the TED, the FPLA and the ROMs are socketed) ...although, these sockets are considerably better than those frequently blamed for problems of the early VIC-20s and PETs, so, problems like that are still relatively rare.
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