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Old 17th Sep 2020, 12:13 pm   #44
Buzby123's Avatar
Join Date: Oct 2011
Location: Culcheth, Cheshire, UK.
Posts: 406
Default Re: I found it !. A very sorry looking MK14

I'm beginning to think it would be easier to design and build a new MK14. This hacked board of mine is giving me grief.

I've taken the 8154 out, and swapped the ceramic 8060 for a plastic one, just in case I make a slip.

Powered up, drawing 0.42A, looks OK. Clock is running, 8060 data lines all wiggling about. DB0-3 solid 0-5v, but DB4-7 show some 'half-way' levels. Not too worried about them yet.

Most address lines on 8060 look reasonable, but AD09,10,11 don't look happy at all.

I now need to find where these go. The SOC drawing is no use, because I completely re-hashed the address decoding, and most of it is now on that verowired daughter board !.

Wish me luck !.


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