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ASCII Adjust After Subtraction                   Flags:  O D I T S Z A P C
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Syntax:  AAS                                             ?       ? ? ± ? ±
 
  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, then AH is decremented and the
  carry and auxiliary carry flags are set. Otherwise, the carry and
  auxiliary carry flags are cleared.
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