Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uwm.edu!csd4.csd.uwm.edu!jeffd
From: jeffd@csd4.csd.uwm.edu (Jeffrey Alan Ding)
Newsgroups: comp.sys.apple
Subject: Re: MNP level 5 with Apple II series
Message-ID: <2671@uwm.edu>
Date: 1 Mar 90 07:10:12 GMT
References: <9002281406.AA15912@masig2.ocean.fsu.edu>
Sender: news@uwm.edu
Reply-To: jeffd@csd4.csd.uwm.edu (Jeffrey Alan Ding)
Organization: University of Wisconsin-Milwaukee
Lines: 40

In article <9002281406.AA15912@masig2.ocean.fsu.edu> legler@masig2.ocean.fsu.edu (David M. Legler) writes:
>I recently bought a nice 2400 baud modem with level 5 MNP support only to
>discover that the Apple II series will (according to the modem manual) NOT
>support level 5 MNP modem protocol because of the lack of ability to do 
>hardware handshaking with the modem.  Looking at some of the Apple manuals
>
>I would be most appreciative of any help, thanks.
>
>
>Mr. David M. Legler           ||(904)644-1159 or 644-4581  

I've been using a 2400 baud modem with MNP level 5 for several months now with
no problem at all.  My modem is called the Bulletmodem from E-Tech Research.
It's been very reliable.  I use the modem with my Apple //c computer.

Handshaking between the modem and computer is necessary because the serial
transfer rate between modem and computer is faster when using MNP level 5 than
the line speed of the modem.  They call this the DTE data rate.  I can set
the data rate to any value from 300 to 19200 bps.  I like this feature the
best.  I set the terminal speed to 4800 baud, and no matter what speed the
modem connects at, I don't have to change the terminal speed or wonder if
it's set wrong.

My modem has 5 different handshaking protocols.  I use DTR/DSR flow control
because that is the only thing the //c port has.  Xon/Xoff flow control
is supported by the modem but I found out that it interferes with downloading.

One nice feature when using a set terminal speed is that I can evaluate how
well the computer can keep up with the modem.  My modem can print a list
of its configurations and S-registers.  I use this for the test.  At
4800 baud, the data is transfered succesfully to the computer.  During
scrolling, the modem send faster than what the computer can handle.  Thanks
to interupts, no data is lost.  At 9600 baud, the computer chokes.  I send
it an AT command and I don't even get the OK signal back.  I tried
several term programs including Kermit, Talk is Cheap, Zlink, and Mousetalk.
Talk is Cheap was the fastest in scrolling.  No program worked at 9600 baud.

My computer is only running at 1 MHz.

Jeffd@csd4.csd.uwm.edu