>
>>That's due to a Microchip stupidity in the default linker files.  For some
>>idiotic reason, they define a section starting at 4 of some small arbitrary
>>length.  Quite often your ISR will need more space than that.


OK.  Thanks to everyone for the clarifications.  My initial frustration was
in following the IDE user manual, adding the 16f84atempo.asm and
16f84.lkr files in the project wizard (as advised) and then having assembly
errors.  Not a good start.  If I interpret what has been said correctly, the 84
linker script has insufficient space allocated for the ISR in the 84 asm
file.   At any rate, I think I now understand what I need to do.  Thanks again.

John Piccirillo 
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