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Old 30th Jul 2021, 7:13 pm   #36
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,485
Default Re: MK14 Programming Interface

If you do document the wiring for the JMP replica watch out for the fact that the top two pins from the Pi are swapped over on the JMP version. Since these are hard wired for the standard MK14 on your uploader PCB, it will instead be necessary to swap the top two column lines over as they go from the uploader to the JMP.

This is best illustrated by the first of two circuit images in this post in the original uploader thread.

https://vintage-radio.net/forum/show...4&postcount=30

The second circuit looks tidier because the Pi pins used to operate the upper two optos have been discreetly swapped, but on your PCB that would involve having to cut and redirect the connections to the Pi.

In the real world, better to leave the Pi connections untouched and swap the wires over as they go from the uploader to the MK14 (as per the first of the two diagrams).
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