DEC - Decrement

        Usage:  DEC     dest
        Modifies flags: AF OF PF SF ZF

        Unsigned binary subtraction of one from the destination.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        reg8              3     2     2     1             2
        mem             15+EA   7     6     3            2-4
        reg16/32          3     2     2     1             1


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