Function            isgameport - is a game port installed

  Syntax              boolean isgameport(void);

  Prototype in        ibm.h

  Remarks             checks if a game port is installed.

  Return value        returns TRUE if a game port is installed, FALSE
                      otherwise.

  See also            joystickAx(), joystickAy(), joystickBx(),
                      joystickBy(), joysticksettings()

  Example             #include <ibm.h>

                      main()
                      {
                           printf("Game port is ");
                           if (! isgameport())
                                printf("not ");
                           printf("installed\n");
                      }