Posted By
filker
on 2018-01-12
16:00:28
|  Re: Possible 8501 replacement kit?
At last, about two decades later, I repaired my problematic Plus/4. It was working only when it's cooled down to ~0 degree Celsius!.. It turned out that the 6551 was the problem. I had checked it years ago and desoldered its +5V though. Only the complete removal of the 6551 solved the problem (after inspecting all the traces and changing almost all the diodes, caps, RAMs, etc.).
Anyway, now I can try this modified 6510 in place of 8501. I'm planning to mod the kernal by myself for serial I/O remapping.
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