AAS - Ascii Adjust for Subtraction

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

        Corrects result of a previous unpacked decimal subtraction in AL.
        High order nibble is zeroed.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              8     3     4     3             1
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