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> Hi there,
> I am new to design with the PIC. I am about to present a class LED =
> driving demo using a PIC 16F84. I recently ordered my parts but realised =
> I forgot to order the 4Mhz clock oscillator. I don't have enough time =
> (three days) to wait for a mail ordered oscillator. Can I use a 4 Mhz =
> signal from a signal generator instead. Any other alternatives?

Where are you? Go down to RatShack and buy a 3.58 Mhz colorburst crystal.
It'll run a little slower, but should be just fine.

BAJ