Thanks Melanie

Yes, what you suggested is what I did initially to find that adding DEFINE OSC 20 changed the timing on a blinking LED (using some PAUSE statements) back to what it was at 4 MHZ.

I guess I should have looked at page 172 of the manual a little closer.

From that I gather then, only the "timing - related" commands will operate at basically a 4MHX clock rate, - and everything will be faster by a factor of 5 ..

I need the extra speed to get through a lot of IF-THEN statements faster.

Thanks

Ken