NI-6503 board.

To anyone who might know:
I have an NI-6503 board.   I am using the ni_pcidio driver with components
8255 and mite.   The driver loads fine and I am able to read the IO lines
fine with the upper level commands comedi_data_read(), comedi_data_write(),
and comedi_bitfield().   I would like to get an interrupt on an input change
on the DIO port.   Looking at the driver, it looks like SIGIO is fed up, so I potentially
could use a signal handler or ideally I would like to use the select() command
and block on that until I get an input change on the DIO port.   In looking at the
driver, the comedi_cmd  and comedi_cmd_test are very limited on support.
I am using driver version *.67.    I used the methodology in the sigio.c example program
to set up the fcntl SETFL and F_SETOWN for the SIGIO interrupt.   If anyone has
worked with this board or the ni_pcidio driver and has any suggestions, please let me
know.
Thanks and regards,
Joseph