> I've always done an external PUP on input pins. This might sound rather
> dumb,

Yup.

> but if you enable the weak pup on PORTB, can you actually see them
> pulled EXTERNAL to the pin (as in using a logic probe), or is it just
> internal?

THINK about it.  What use would an internal pullup be that isn't reflected
on the input pin?  If the input is high, you want the bit to read 1.  If the
input is low, what would you want it to do?  If it reads 0 then the pullup
has no effect.  If it reads 1, then the input is useless.


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