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(nasm.info)Section B.4.59

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B.4.59. `DIV': Unsigned Integer Divide
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     DIV r/m8                      ; F6 /6                [8086]
     DIV r/m16                     ; o16 F7 /6            [8086]
     DIV r/m32                     ; o32 F7 /6            [386]

   `DIV' performs unsigned integer division. The explicit operand
provided is the divisor; the dividend and destination operands are
implicit, in the following way:

   * For `DIV r/m8', `AX' is divided by the given operand; the quotient
     is stored in `AL' and the remainder in `AH'.

   * For `DIV r/m16', `DX:AX' is divided by the given operand; the
     quotient is stored in `AX' and the remainder in `DX'.

   * For `DIV r/m32', `EDX:EAX' is divided by the given operand; the
     quotient is stored in `EAX' and the remainder in `EDX'.

   Signed integer division is performed by the `IDIV' instruction: see
*Note Section B.4.117::.