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Old 8th Nov 2020, 10:14 am   #87
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 7,293
Default Re: I found it! A very sorry looking MK14.

I can see why, when you were driving extended / external display hardware, you changed that IC from an open collector type to a TTL-output type but for the 'classic' MK14 display setup you probably need to change it to a 7445 - note this was an 'original' 7445 and not 74xx45.

That still won't be the root cause of the problem though.
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