AAA - Ascii Adjust for Addition

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

        Changes contents of AL to valid unpacked decimal.  The high order
        nibble is zeroed.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              8     3     4     3             1


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