>     swapf    w,0

The first argument of swapf must be a file register. W is not a file
register, so this does not work. The assembler will accept it, because w and
f are just symbolic equivalents for the 0 and 1 that are used to specify the
destination. Try "swapf f,0": it will be accepted by the assembler for the
same reason that "swapf w,0" is accepted.

Wouter van Ooijen

van Ooijen Technische Informatica: http://www.xs4all.nl/~wf/
Jal compiler for PIC microcontrollers:  http://www.xs4all.nl/~wf/wouter/jal

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