Path: news.uiowa.edu!news.physics.uiowa.edu!math.ohio-state.edu!howland.erols.net!newsfeed.internetmci.com!news.corpcomm.net!news.uoregon.edu!cie-2.uoregon.edu!nparker
From: nparker@cie-2.uoregon.edu (Neil Parker)
Newsgroups: comp.sys.apple2.comm
Subject: Re: ZOOM Modems- do they just suck, or is it me?
Date: 30 Oct 1996 10:22:29 GMT
Organization: University of Oregon Campus Information Exchange
Lines: 56
Message-ID: <557a95$lio@pith.uoregon.edu>
References: <5565ic$ka@darla.visi.com>
NNTP-Posting-Host: cie-2.uoregon.edu
NNTP-Posting-User: nparker

In article <5565ic$ka@darla.visi.com> kermit@visi.com (Frederick Gotfredson)
writes:
>I have had my ZOOM 14.4 faxmodem for about 2 years, and it's only worked
>correctly with a handful of programs and BBSes.  It will NOT connect
>to any dialup correctly.
>
>What happens is that it skips characters- while it's connected with
>LAPM and V.42bis?  impossible.  Which leads me to believe the RTS/CTS is
>failing.  I have the right cable, etc, etc... and it WORKS *sometimes.
>
>A couple of days ago, I got an init string for it, and it worked just
>FINE, but then the next day, it failed to work, as usual.  
>
>So what I have to do is set my DTE down to 9600. (oh yes, Excellent
>throughput here)
>
>Any help out there?

I've been using the same modem myself for a couple of years, and I've never
had any trouble with speeds up to 38400.

My settings are N1&C1&D0&K3\N3 (I'm also partial to W1S95=44, but that's
just a cosmetic issue).  In my IIGS's Control Panel, I have the modem port
set as follows:

     Buffering: Yes
     Baud: 19200
     DCD Handshake: No
     DSR/DTR Handshake: Yes
     XON/XOFF Handshake: No

(But note that some terminal programs don't use the Control Panel settings...
check your terminal software manual.)

With these settings, I find that Kermit-65 works flawlessly.


If you don't have a IIGS, getting speeds higher than 9600 baud to work could
be a bit of a challenge.  The vast majority of non-IIGS serial cards seem to
use the 6551 ACIA chip, which maxes out at 19200 baud, and which has a
design flaw that renders it essentially useless for RTS/CTS handshaking.
The only cure that I know of for these problems is the TurboASB, which is
an add-on device for the Apple Super Serial Card that allows it to run
faster than 19200 baud.  I'm not sure, but if you're lucky, it might also
fix the RTS/CTS problem.

If you have a IIc, you're pretty much out of luck.  Not only do the IIc
serial ports use the 6551, but their plugs don't even have enough wires to
implement RTS/CTS handshaking (except on the IIc+).

            - Neil Parker
-- 
Neil Parker                       | No cute quote, no cute ASCII art, no cute
nparker@cie-2.uoregon.edu         | disclaimer, no deposit, no return....
nparker@cie.uoregon.edu           | (This space intentionally left blank:
http://cie-2.uoregon.edu/~nparker |                                           )