AAD - Ascii Adjust for Division

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

        Used before dividing unpacked decimal numbers.   Multiplies AH by
        10 and the adds result into AL.  Sets AH to zero.  This instruction
        is also known to have an undocumented behavior.

        AL := 10*AH+AL
        AH := 0

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              60    14    19    14            2

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