XCHG - Exchange

        Usage:  XCHG    dest,src
        Modifies flags: None

        Exchanges contents of source and destination.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg,reg           4     3     3     3             2
        mem,reg         17+EA   5     5     5            2-4  (W88=25+EA)
        reg,mem         17+EA   5     5     3            2-4  (W88=25+EA)
        accum,reg         3     3     3     3             1
        reg,accum         3     3     3     3             1


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