>My thought is that if you take a 20 MHz chip
>and crank it  >to 25 or 30,

You would be better off using an 18F... series chip with a 10MHz crystal,
and 4x PLL so it is running at 40MHz internally. This is a proper mode and
means that it is running within spec, and not overclocked. You also get the
wider range 18 series instructions and simplified memory model.

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