Thanks for all of the help. I guess my first step is to go get another crystal that is definitely designed for parallel resonance. How do you tell if a crystal is designed as such? I looked in my Digi-Key catalog and they don't have anything called a parallel crystal. Can you assume that if the load capacitance is given, that it is parallel? For the price of some of these crystals, I can get a TTL clock oscillator. In the PIC data book, they show a buffer on the output of the oscillator, is this required if I am only running one device (the PIC) from the clock? Thanks, Norm