>> And yes, adding resistors between the micro and the real world is always
a
>> good idea, up to the point where the resistor begins to interfere with
>> getting the job done.
>
>Even between two micros on the same board?  Two more components to
>assemble, two more points of failure?

Well, of course the trick here is to put the pads so that by rotating an SMD
0 ohm resistor 90 degrees, it swaps the pin connections for you ... or you
could make the pads so that they are those little arrow ones where solder is
enough to bridge the gap - ideal for configuration "switches" where you
don't want to put an actual DIL switch.

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