Greg writes:

> What I do not find on that page is the fairly simple method of inverting the
>  bits, so ASCII A, decimal 65, bin 01000001, becomes bin 10111110, decimal
>  190...

To mathematically create this simple form of bit complementation, use a
subtract operator, subtracting from 2^n - 1, where n is the number of bits
that your register of interest occupies. E.g., for 8 bits:

     255 - 65 = 190

Voila.

Wirt Atmar

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