CMP - Compare

        Usage:  CMP     dest,src
        Modifies flags: AF CF OF PF SF ZF

        Subtracts source from destination and updates the flags but does
        not save result.  Flags can subsequently be checked for conditions.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg,reg           3     2     2     1             2
        mem,reg          9+EA   7     5     2            2-4  (W88=13+EA)
        reg,mem          9+EA   6     6     2            2-4  (W88=13+EA)
        reg,immed         4     3     2     1            3-4
        mem,immed       10+EA   6     5     2            3-6  (W88=14+EA)
        accum,immed       4     3     2     1            2-3


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