> For normal operation, jumpers are placed across the top 4
> spaces to connect the PIC pins to where they normally go. To
> program, the jumpers are removed and a cable is plugged in

That's a pretty easy way to do it (and you can glue the 4 jumpers
together). I've been looking around for a "switching" header to
bypass the need to isolate the PIC before programming. I've
made one from a piece of edge connector and springy contacts
from an edge socket like this (four side by side, 0V isn't broken)

|/
|\
||
||
ab

where "a" goes to the PIC and "b" goes to the rest of the circuit,
and the ICSP breaks the contact and connects to "a" but it was a
real fiddly PITA. Works OK but it's uncertain how long this homer
will keep good ohmic contact when the unit is out in the field, even
with gold plating. And I don't fancy trying to make more than a few
of them. Anyone know of anything suitable off-the-shelf ?

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