HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                 OUTS - Output String to Port  (80188+ only)

       Usage:  OUTS    port,src
               OUTSD  (386+ only)
       Modifies flags: None

       Transfers a byte, word or doubleword from "src" to the hardware
       port specified in DX.  For instructions with no operands the "src"
       is located at DS:SI and SI is incremented or decremented by the
       size of the operand or the size dictated by the instruction format.
       When the Direction Flag is set SI is decremented, when clear, SI is
       incremented.  If the port number is in the range of 0-255 it can
       be specified as an immediate.  If greater than 255 then the port
       number must be specified in DX.  Since the PC only decodes 10 bits
       of the port address, values over 1023 can only be decoded by third
       party vendor equipment and also map to the port range 0-1023.

                                Clocks                 Size
       Operands         808x  286   386    486         Bytes

       port,src          -     5     14     17           1
       port,src (PM)     -     -    8/28 10/32/30        1

       - 386+ protected mode timings depend on privilege levels.

         first number is the timing when:    CPL ≤ IOPL
         second number is the timing when:   CPL > IOPL
         third number is the timing when:    virtual mode on 486 processor

       - see Instruction Timing

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