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OUTSW             Output Word String (186/286/386) Flags: O D I T S Z A P C

OUTSW

           Logic:          destination port . WORD PTR ES:DI
                           if DF = 0 then
                               DI . DI + 2
                           else
                               DI . DI - 2

     This instruction sends words from a string to a port. The source string
     is pointed to by ES:DI. The input port number must be in DX. If the
     direction flag is set, DI is decremented by 2. If it is not set, DI is
     incremented by 2.

  --------------------------------------------------------------------------
   Operands                   Clocks   Transfers  Bytes  Example
   OUTSW                      14 (386)     -        1    OUTSW
  --------------------------------------------------------------------------

        Note:          This instruction is usually used with a REP
                       prefix. Load CX with the number of times to repeat
                       the instruction.