[comp.sys.ibm.pc] com2/DOS problem

harris@ecsvax.UUCP (Mark Harris) (11/18/86)

I am posting this for a friend:

        My com2 is on a Quadport-AT (from Quadram).  It's connected to
an ADDS Viewpoint.

        It seems to be working properly as a Unix terminal.  It also seems
to be working with pc-vt into the VAX through the lan.

        The problem is: when I try to use it directly from DOS, it doesn't
work.  I issue the mode command, then do DIR > com2.  I get an error
message Write fault ..... on device com2.

        Com1 works fine.

        The same thing happens in DOS 2.1 (as well as 3.2).

Mark Harris
Appalachian State University

tj@utcs.UUCP (11/24/86)

I think this is the classic problem of not receiving the proper modem
control signals at the various rs232 pins. Now some boards allow you to
use jumpers to force certain signals true or false and I suspect that your
COM1 port is this way and COM2 does not have CTS and DTR true.