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From: USERSIG@MTSG.UBC.CA
Newsgroups: comp.sys.apple2
Subject: Super Serial vrs internal gs serial port
Message-ID: <2445854@mtsg.ubc.ca>
Date: 22 Sep 90 20:31:36 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 34

>Anyone know if the super serial card has problems with higher baud
>rates.  If I use the builtin port can I expect to go beyond 2400? 
>(Interrupts are already turned on on the super serial card). 
 
First of all, I don't understand why you are bothering with a Super
Serial Card.  why not just put a switch box on port 2 so you can
switch between the two connections.  That's what I do and it
certainly is quicker than going to the control panel to switch
between modem port and your card.  I assume you are using your
printer port for a printer or appleshare, but if you're not, you
could put one connection on the printer port and set the control
panel for a modem of course. 
 
I tried a Super Serial Card in a IIgs, because a person wanted to
use an old comm program that did not work with the built-in port. 
The program worked with the SSC in the IIgs, but not at 9600 or
19200 baud.  The reason for this is that the higher speeds require
interupts to be enabled on the SSC, but my GS would not work properly
(or was it that it wouldn't work at all?  - can't remember) with
interupts turned on.  I showed this person that Kermit and Procomm
worked at 9600 or 19200 baud on the built-in port, so he was
convinced the extra speed was worth learning a new program. 
 
You say that you have interupts enabled on your SSC.  This sounds
questionable.  Are you sure?  What ROM version do you have.  I have
the second ROM (ie.  the one that displays ROM 01, not the original
old ROM.) 
 
For a switch box, you could use either a DB25 type or a mini DIN 8
type (sold as Mac switch boxes) depending on your cable setup.
 
Les Ferch
Computing Services
University of British Columbia