> Oh.  Rats!  I suppose it would be OK if you have the entire port set to
> be inputs, as in a keyboard scanner?

I'm sure that's an original purpose of PortB - a 4x4 keypad interface

You might find something useful here

AN566 - Using the Port B Interrupt on Change as an External Interrupt

http://ww1.microchip.com/downloads/en/AppNotes/00566b.pdf

AN552 - Implementing Wake Up on Keystroke

http://ww1.microchip.com/downloads/en/AppNotes/00552e.pdf

AN552 Source code

http://ww1.microchip.com/downloads/en/AppNotes/00552.zip

Interestingly, this application does not use IoC, although the
4x4 keypad is right across PortB (figure 2)

AN557 - 4-channel Digital Voltmeter with display and keypad

http://ww1.microchip.com/downloads/en/AppNotes/00557c.pdf

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