XOR - Exclusive OR

        Usage:  XOR     dest,src
        Modifies flags: CF OF PF SF ZF (AF undefined)

        Performs a bitwise exclusive OR of the operands and returns
        the result in the destination.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg,reg           3     2     2     1             2
        mem,reg         16+EA   7     6     3            2-4  (W88=24+EA)
        reg,mem          9+EA   7     7     2            2-4  (W88=13+EA)
        reg,immed         4     3     2     1            3-4
        mem,immed       17+EA   7     7     3            3-6  (W88=25+EA)
        accum,immed       4     3     2     1            2-3


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