Museum

     Name
          inp, inpw - Read a byte or a word.

     Syntax
          #include <conio.h>

          int inp(port)

          unsigned inpw(port)
          unsigned port;

     Description
          The inp and inpw functions read a byte and a word,
          respectively, from the specified input port. The input value
          can be any unsigned integer in the range 0 - 65,535.

          Both inp and inpw are supported in OS/2 protected mode. If
          you use these functions, you must also use a .DEF file to
          declare the IOSEG segment that the run-time library uses to
          perform input/output on the port. In addition, the intrinsic
          (-Oi) versions of these functions do not work unless you put
          the code in a segment that is marked with the IOPL keyword
          in the .DEF file.

     Return Value
          The functions return the byte or word read from port. There
          is no error return.

     See Also
          outp(DOS), outpw(DOS)

     Example
          #include <conio.h> #include <stdio.h>

          /* Read will be done on port #0: */

          unsigned int port = 0; char result;

          main()
           {
                  /* Input a byte from the port: */

                  result = inp(port);
                  printf("The value from port #%d is %d\n", port,
          result);
           }

          This program reads a character from input port 0.

                                                (printed 6/18/89)