> Pick an arrangement - I use power, Vpp, PGD, PGC, Gnd for all my
> designs, just b/c the first ICSP PIC board I made, that's what I did,
> pretty arbitrarily chosen.  Maybe pick an order such that if the cable
> is plugged in backwards it doesn't short though.  (but I haven't blown
> anything up the few times I put the cable on the board backwards.)
> Like... power, PGC, gnd, Vpp, PGD?  not sure.  Maybe having Vpp on a
> programming pin is worse if cable swapped.  Or make a 6-pin and key it.

I use Vpp, Vdd, Gnd, PGD and PGC.  The reason for that is simple:
I can plug the header into a breadboard such that the last two pins
go directly into the same rows as RB7 and 6.  Easy.

Mike H.
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