Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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IDIV Instruction
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  Title:    Signed Divide                         Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   IDIV src                                     ?       ? ? ? ? ?
 
  See also: DIV, IMUL, MUL, SAR
 
  Description:
 
     Divides an implied destination operand by a specified source
     operand. Both operands are treated as signed numbers. If the
     source (divisor) is 16 bits wide, the implied destination
     (dividend) is the DX:AX register pair.
 
     The quotient goes into AX and the remainder goes into DX. If the
     source is 8 bits wide, the implied destination is AX. The quotient
     goes into AL and the remainder into AH. On the 80386/486, if the
     source is EAX, the quotient goes into EAX and the remainder
     into EDX.
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