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  Title:    Decimal Adjust after Subtraction      Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   DAS                                          ?       ± ± ± ± ±
 
  See also: DAA, AAA, AAS, AAM, AAD
 
  Description:
 
     Adjusts the result of an 8-bit subtraction to a packed BCD number
     (less than 100 decimal). DAS converts this result to packed BCD
     format with the least significant decimal digit in the lower four
     bits and the most significant digit in the upper four bits.
 
     If the sum is greater than 99h after adjustment, the carry
     and auxiliary carry flags are set. Otherwise, the carry and
     auxiliary carry flags are cleared.
                                    -♦-