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IBM Modem to Macintosh Serial Port

Posted on 1997-02-22
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Last Modified: 2013-12-27
I have a power Mac 7200 DOS compatible running
WIN95 on the DOS side and a Banksia Wave SP 336
Voice Fax Data Modem hooked to the Apple serial
port via an adaptor cable. The modem runs fine off the
Apple side, but I have been unable to get it to function
on the DOS side, which I need to do. When dialling in
to my service provider (manually, which is what they have recommended) using the DOS side, sometimes I can not even type into the dial screen at all, sometimes I can type in and everything works fine until I have entered my Login,
but then it won't ask me for my password. At one
point, it went all the way through the sequence and
connected to the server, but then just kept running a
long string of computer speak and wouldn't let me do
anything else. I have checked the login settings etc and
all seems to be OK. I have been told it's everything
from not sending carriage returns to needing a "high
speed handshaking adapter cable". Can you give me a clue which avenue is likely to bring results?



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Question by:sha
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Accepted Solution

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sweston earned 100 total points
ID: 1541620
It definatly sounds like a flow control/handshaking issue,
though it is easy enough to check if it is an issue regarding
sending carriage returns.

To check if it is a carriage return "problem"...
Dial-in, type in your username and hit Control-M instead of
Enter.

Dial-in, type in your username and hit Control-J instead of
Enter.

If it works using Control-M all the time instead of Enter then
you need to send carriage returns.

If it works using Control-J all the time instead of Enter then
you need to send line feeds.


More than likely though it is a hardware handshaking issue...

I would check the following:

1.  Check with your service provider and see what type of
handshaking they are using (software or hardware).  If you are
using PPP then you will need to use hardware handshaking.

2.  Make sure the serial cable connecting your modem and serial
port on your IBM is a straight through cable (this is of course
impossible if you are using a DB-9 pin port on the back of
your computer).  If it is a RS232 DB25 pin port on the back of
your computer make sure the pin outs are straight through.

3.  Make sure that you have the proper INIT string for your
modem.  If your provider is using hardware handshaking (chances
are that they are), make sure you have a cable that supports it
(most modem cables you buy in the stores now adays do) and
make sure your modem init string contains the parameters
to do hardware handshaking.

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