Calcomp part 2, new generation

Ok, this is my last try, if this mail is ending with "this:" it's just
another unix-miracle, if not, i'd apreciate any help!

Hi, I'm trying to run a Calcomp 9100 digitizer on a Data General. I have to
problems. First, I don't know which digitizer format file I need, because
the manual disappeared. The format the digitizer is sending looks like this:

43821,10853,ARU
43819,10852,ARU
43820,10851,ARU

Second, everytime I've read from the tty00 port the read permission is gone.
So I can use the port only once and have to set bach th read permissions
with chmod. Any Ideas?

Stefan Jaeger