Re: Sun Microcomputer II Motortester 1215
There's nothing there that looks even remotely difficult to reverse-engineer if you had the time and inclination.
Thinking about the fault, it seems that the functions that use the ADC are playing up, the ones that work probably don't use it (things like timing measurements). So that's where I'd start, check the input and reference (and supply voltages) in that area.
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