NEG - Two's Complement Negation

        Usage:  NEG     dest
        Modifies flags: AF CF OF PF SF ZF

        Subtracts the destination from 0 and saves the 2s complement of
        dest back into dest.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg               3     2     2     1             2
        mem             16+EA   7     6     3            2-4  (W88=24+EA)


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