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inp()                    Read a Byte from the Specified Port

 #include   <conio.h>                    Required for declarations only

 int        inp(port);
 unsigned   port;                        Port number

    inp() reads 1 byte from the specified input port 'port'.  'port' must
    be an unsigned integer in the range 0 to 65535.  The port does not
    have to be opened or closed before I/O is performed, so there are no
    corresponding open or close routines.

    Returns:    The byte read from 'port'.  There is no error return.

      Notes:    The console I/O and port routines are not compatible with
                stream or low-level library routines and should not be
                used with them.

  -------------------------------- Example ---------------------------------

    The following statement reads a byte from port number 'port_num'.

        #include <conio.h>

        unsigned port_num;
        char ch;

        main()
        {
            port_num = ...
            ch = inp(port_num);
        }