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Old 8th Dec 2020, 10:06 pm   #145
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 6,754
Default Re: I found it! A very sorry looking MK14.

I listed those checks in 'risk order' hence trying the PROMs and SC/MP last as they are the most unique parts which you wouldn't want damaged by, ie, undetected faulty TTL IC.

So it's looking like you have failure of your new-OS PROMs now? If you want, send just those ones back to me and I'll check them again. If one has now failed I can try to over-programme it (reprogram it with the same code) on the off chance that one of the fuses might have managed to re-grow (apparently that can happen, they have a similar problem to the well known 'tin whisker' disease which commonly affects certain types of germanium transistor).
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