AAM - Ascii Adjust for Multiplication

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

        AH := AL / 10
        AL := AL mod 10

        Used after multiplication of two unpacked decimal numbers, this
        instruction adjusts an unpacked decimal number.  The high order
        nibble of each byte must be zeroed before using this instruction.
        This instruction is also known to have an undocumented behavior.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              83    16    17    15            2

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