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(nasm.info)Section B.4.184

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B.4.184. `MUL': Unsigned Integer Multiply
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     MUL r/m8                      ; F6 /4                [8086]
     MUL r/m16                     ; o16 F7 /4            [8086]
     MUL r/m32                     ; o32 F7 /4            [386]

   `MUL' performs unsigned integer multiplication. The other operand to
the multiplication, and the destination operand, are implicit, in the
following way:

   * For `MUL r/m8', `AL' is multiplied by the given operand; the
     product is stored in `AX'.

   * For `MUL r/m16', `AX' is multiplied by the given operand; the
     product is stored in `DX:AX'.

   * For `MUL r/m32', `EAX' is multiplied by the given operand; the
     product is stored in `EDX:EAX'.

   Signed integer multiplication is performed by the `IMUL' instruction:
see *Note Section B.4.118::.