27th Mar 2021, 5:33 pm
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#269
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Octode
Join Date: Mar 2019
Location: Barry, Vale of Glamorgan, Wales, UK.
Posts: 1,362
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Re: I found it! A very sorry looking MK14.
Quote:
Originally Posted by Buzby123
Micky is not having anymore experiments done on him, he has earned a decent retirement.
Vicky however is going to take his place, and the power reduction mod looks like it's the first to be tried.
Below is the /OE signal on the 571s while scanning keyboard and display. As you can see, it spends the vast majority of it's time in the dis-enabled state. The /OE pulses are 500nS wide, and the gaps are mostly 3uS to 15uS, so a power reduction of 90% is likely.
I'll try this mod next week, in a new thread.
Cheers,
Buzby
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Sounds interesting - nice find.
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