Thank you all for your help with the Compare Mode.
It seems I have figured out my problem.  Too many interrupts from the main
code.  I have a software 'serout' command that doesn't like to be
interrupted.

I had intended to use to compare module as a software solution to my
current hardware configuration of PWM thru an RC (analog out), then to a
Voltage-to-Frequency convertor.  The PWM that the PIC has doen't need to
cause interrupts.   Now I can refine my V/F convertor and achieve the
square waves I have been looking for.

Unless anyone can tell me why I should try to iron-out a software
frequency driver????
-Dave Celsnak
Senior, Western Michigan University
(Get me out of here, asap!)