> I need to implement the following equation in a 16F876.
> RESULT = (255 / A) * B
> A and B are bytes (each have possible values of 01 to FF)
> RESULT is a word (unsigned) for a timer routine counter.

You probably want to do the multiply first to maintain your precision. Does
mean having a 16 bit result that you then divide by 8 bit, but as the
multiply is a 7 bit shift plus an add, it will not take long. There should
be a suitable divide routine in the FAQ.

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