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From: page@humu.NOSC.Mil (Ward C. Page)
Newsgroups: comp.sys.mac.programmer
Subject: Serial port questions
Message-ID: <554@humu.NOSC.Mil>
Date: 18 Apr 91 19:36:15 GMT
Followup-To: page@cod.nosc.mil
Organization: Naval Ocean Systems Center, Kaneohe Hawaii
Lines: 12

I am trying to read and write to the modem port to control a laser disc.
I can open the RAM serial driver OK (I can't get the ROM driver open)
and I can even send stuff out the output port, but I have trouble reading
stuff from the input port.  In particular, the Mac hangs when I try to
read the input port.  I believe the problem is with the number of desired
characters since the read will work at times.  When I do a SerGetBuf
I always get a count of 0 even when I can read the port.  Any suggestions
or example code would be greatly appreciated.

Ward Page
Naval Ocean Systems Center
Kaneohe, Hawaii