Ref: 03250049
Title: Using SYNC Serial B port with AppleTalk port on 3S/400
Date: 08/11/88

Copyright 3Com Corporation, 1991.  All rights reserved.

When using my AppleTalk port on my 3S/400, my SYNC Serial B port
won't function.  Am I doing something wrong?

A.  No, this port shares circuitry with one of the RS-232C Ports.
Its use disables the SYNC Serial B port.  Also note that when
using software version 1.3.1, you lose access to comm ports 4 and
5.
