> >>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.
> >
> > Or use PORTB with it's internal pullups.

I think we had problems with switches in pins with pull-ups. The PIC
pull-ups were a little on the weak side, and the environmet was very noisy
(big AC machines switching on and off in the nearby). This was IIRC with a
PIC12CE674. Watch the noise.

No problem with matrix keyboards and PIC pull-ups in other projects,
thought.


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