DAA - Decimal Adjust for Addition

        Usage:  DAA
        Modifies flags: AF CF PF SF ZF (OF undefined)

        Corrects result (in AL) of a previous BCD addition operation.
        Contents of AL are changed to a pair of packed decimal digits.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              4     3     4     2             1

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