INS - Input String from Port  (80188+)

        Usage:  INS     dest,port
                INSB
                INSW
                INSD    (386+)
        Modifies flags: None

        Loads data from port to the destination ES:(E)DI  (even if a
        destination operand is supplied).  (E)DI is adjusted by the size
        of the operand and increased if the Direction Flag is cleared and
        decreased if the Direction Flag is set.  For INSB, INSW, INSD no
        operands are allowed and the size is determined by the mnemonic.

                                 Clocks                 Size
        Operands         808x  286   386    486         Bytes

        dest,port         -     5     15     17           1
        dest,port (PM)    -     5    9/29 10/32/30        1
        none              -     5     15     17           1
        none (PM)         -     5    9/29 10/32/30        1

        - 386+ protected mode timings depend on privilege levels.

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


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