Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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AAD Instruction
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  Title:    ASCII Adjust before Division          Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   AAD                                          ?       ± ± ? ± ?
 
  See also: AAA, AAS, AAM, DAA, DAS
 
  Description:
 
     Converts unpacked BCD digits in AH (most significant digit) and AL
     (least significant digit) to a binary number in AX.
 
     Use this instruction to prepare an unpacked BCD number in AX for
     division by an unpacked BCD digit in an 8-bit register.
                                    -♦-