Re: I found it! A very sorry looking MK14.
If your problem is ROMs, how unlucky are you to have at least one duff IC in both sets of PROMs? If RAM, how unlucky to have at least three faulty ones out of four? It would have taken some odd kind of catastrophe to wipe all of those out but leave the TTL untouched.
The SC/MP itself, I would imagine you can only really prove by substitution.
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