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You read gameport events by passing an I/O request to the device with
GPD_READEVENT set in io_Command, the address of the InputEvent structure
to store events set in io_Data and the size of the structure set in

   struct InputEvent  GameEV;
   struct IOStdRequest *GameIO;  /* Must be initialized prior to using */

   void send_read_request()
   GameIO->io_Command = GPD_READEVENT;  /* Read events */
   GameIO->io_Length = sizeof (struct InputEvent);
   GameIO->io_Data = (APTR)&GameEV;     /* put events in GameEV*/
   SendIO(GameIO);                      /* Asynchronous */

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