Dear Geniuses,

I've been fighting this little debate in my head for some time as to WHAT
pullup resistors do (aren't there pulldowns too?). If you set all the port
bits to 1, doesn't that logically mean they're high? I have a basic idea of
what they are, but I don't know it well enough to utilize it in my projects. I
would greatly appreciate any light that can be shed (this sentence doesn't
sound right..) on this subject.

I thank you all,

Tim Hamel