Harold Hallikainen wrote:

>> Why don't you tri-state the output lines that you don't read? No need for
>> extra parts, and no chance of connecting two outputs together.

> Excellent idea! Just write to the TRIS instead of LAT! And, it takes no
> parts!

Just don't forget that these "outputs" are now usually floating inputs
while tri-stated. So you should make sure that they never stay long in that
state. This usually is given, as you usually poll quickly and cyclically
through all drive lines. 

The "proper" approach would be pull-ups on the output lines. But that's
extra parts, and equal in parts count to your approach of series resistors
in the output lines.

Gerhard
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