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Old 8th Nov 2020, 12:33 am   #82
Buzby123's Avatar
Join Date: Oct 2011
Location: Culcheth, Cheshire, UK.
Posts: 335
Default Re: I found it! A very sorry looking MK14.

Hello all,

Sorry, not had a chance today to even power it up.

Yes, the chip is a 7442. Not sure if that was original from SoC, or if I put it there. Some of the other chips are definatley not SoC, 'cos they've got RS part numbers !.

When the chips were in Micky there was my off-board display, with transistors and FND500's I think, so maybe the on-board chips were not so important then.

Regarding the display, is it the correct one, and have I wired it correctly ?.

The PCBs, both original and replica, have two empty holes at the left end of the display connector. ( I used these forty years ago to supply power to my off-board display. )

At least with this PCB I'm not debugging the wiring, just the chips.

Hopefully I'll get some time tomorrow.


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