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  Title:    ASCII Adjust after Subtraction        Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   AAS                                          ?       ? ? ± ? ±
 
  See also: AAA, AAM, AAD, DAA, DAS
 
  Description:
 
     Adjusts the result of a subtraction to a decimal digit (0-9). The
     previous subtraction instruction should place its 8-bit result in
     AL. If the result is greater than 9h, AH is decremented and the
     carry and auxiliary carry flags are set. Otherwise, the carry and
     auxiliary carry flags are cleared.
                                    -♦-