Path: utzoo!utgpu!water!watmath!clyde!rutgers!ucla-cs!zen!ucbvax!MITRE.ARPA!mcgurrin
From: mcgurrin@MITRE.ARPA
Newsgroups: comp.sys.apple
Subject: Synchronous (HDLC) GS?
Message-ID: <8712181616.AA20668@mitre.arpa>
Date: 18 Dec 87 16:16:11 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The MITRE Corp., Washington, D.C.
Lines: 9

In browsing through the IIGS hardware and firmware technical manuals, I noticed
that the serial port uses a multi-protocol chip that supports synchronous
as well as asynchronous communications.  Does anyone know if this means one
could use the serial port as a synchronous port, assuming the appropriate 
driver software was written, or is there no way to access the necessary
control lines, etc.?  I assume that if possible it would require directly
accessing the chip, not using firmware.  I would be particularly curious
if HDLC LAPB could be supported with the appropriate software (a IIGS with
X.25? an interesting concept!).