> It could be that what you were using before is a parallel cut crystal,
since
> there is a section in the 16F87x manual stating that only series cut
> crystals will operate.  I'd imagine that all the PICs are the same that
way,
> though I haven't checked.

Parallel versus series "cut" really has nothing to do with how the crystal
is cut but rather which operating mode is required to achieve the specified
frequency.  The series resonant and parallel resonant frequencies are
slightly different.


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