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Old 22nd Mar 2021, 6:13 pm   #217
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 8,539
Default Re: I found it! A very sorry looking MK14.

Maybe it's just your photo but it looks like you have taken out two pads on the top side just above-left and above-right of IC16. You haven't drilled them right through but you have used a drill bit to remove those top side pads, or it looks very much that way to me.

If you did, you would have done that to disconnect the outputs of the address decoder from the CE2 inputs of the onboard RAMs so you could direct those chip enables to something else, possibly your battery backed RAMs, which you may have had mapped into the address space normally occupied by the onboard 2111s?
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