Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!mips!wdl1!wdl30!pda
From: pda@wdl30.wdl.loral.com (Paul D Adolph)
Newsgroups: comp.sys.mac.comm
Subject: Re: MNP5 Modem Problem
Message-ID: <1991Jun18.003359.4570@wdl1.wdl.loral.com>
Date: 18 Jun 91 00:33:59 GMT
References: <6142@mindlink.bc.ca> <33@ryptyde.UUCP>
Sender: news@wdl1.wdl.loral.com
Organization: Loral Western Development Labs
Lines: 27

In article <33@ryptyde.UUCP> dant@ryptyde.UUCP (Daniel Tracy) writes:
>Responding to the following:
>>"Can anyone out there in Netland help with a problem I'm having with my modem? I
>>have a MNP5 with v.42 and am wondering if I need a special cable to get these
>>features working with my Mac SE?
>> 
>>I'm currently using my old cable from my 1200 baud modem and, although the
>>modem functions fine at plain-Jane 2400 baud, I cannot seem to get it to work
>>as an error correcting MNP5 modem."
>> 
>I believe you need a cable that supports hardware handshaking. Just ask for
>a Macintosh modem cable for V.32 modems that supports Hardware Handshaking
>at your local dealer, I guess.

No just about it!  I tried about 7 different sources, half of which said they
had "just the right cable" which of course wasn't, and the other half either
had no clue or were not interested in helping me.

After wasting a lot of time on the phone and in various stores, I finally
bought some connectors and cable and built my own.  With just a little
interpretation, all the info I needed I found in the manuals for my 
Classic and the modem.

However, one problem I found is that since the DTR line is used for
handshaking, you seem to lose it for other functions your terminal software
might support, ie "drop DTR on hangup" etc.  I am speaking about a Classic
here -- I don't know if this is the case for the newer machines.