At 02:15 PM 5/26/01 +1200, you wrote:
>I just brought a PIC marked:
>
>PIC16F84A-20/P
>
>This implies a frequency of 20MHz but the data sheet I just down loaded
>specifies a max operating frequency of 10MHz for the 16F84.
>
>Do I have an old data sheet?

Yes, you need one that covers that specific chip. The "A" at the end
is significant, it is really a different die inside with different
characteristics, in general.

You can grab a fresh data sheet from:
http://www.microchip.com/download/lit/pline/picmicro/families/16f8x/devices/
16f84a/35007a.pdf

Best regards,

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