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The key matrix is 4x10, so 14 wires needed. A 15 way sub-D would work
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Ah, you are forgetting about the two wires needed for the reset output from the uploader. That's too useful to leave out, it allows the uploader to force the MK14 back to the monitor if it already happens to be running a program, so it can upload another one.
Also, if you were using a deluxe external keypad you might want to have a reset switch on there as well.