Date   : Sun, 13 Feb 1989 09:30:56 EDT
From   : <SAGE@LL.ARPA>
Subject: Prob with Compaq serial port (COM1)

 
Andrew Sigal wrote:
 
>> It appears that the built in serial port (COM1:) is
>> holding Carrier Detect (CD) high all the time.
 
When I saw this message, I got all excited, because I have been having a
similar problem with an internal modem on my Kaypro 286/16 computer.  The
PCBoard BBS software refuses to run, complaining that carrier detect is
asserted.  I played with all the switches on the board and with the "&C" and
"&D" commands to the modem, all to no avail.  I thought maybe this message
would have some clues for me.  Then I got to the part:
 
>> I just purchased a new modem (Zoom Telephonics 2400 baud external)
 
Curious!  The modem that is giving me trouble just happens to be a Zoom
modem (model 2400 PC, I believe it is called -- very fancy with internal
messaging capability, real-time clock, demon dialing, etc.)!  Probably just
a coincidence, but...  This modem claims to be as Hayes compatible as a
Hayes, but no matter what, that carrier detect signal seems to be there all
the time.
 
I will have to get myself copies of the two programs mentioned, BRKBOX and
COMHELP, and see what they report about the modem interface.  I tried
writing a quick Turbo Pascal program to look at the ports, but I did not
succeed in learning anything useful.
 
Does anyone have any suggestions on this problem?  Anyone else own this
modem?
 
-- Jay Sage
 


End of INFO-CPM Digest
******************************