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From: bill@crystal.UUCP (Bill Cox)
Newsgroups: net.micro.mac
Subject: Re: Mac-modem pin configuration.
Message-ID: <32@crystal.UUCP>
Date: Mon, 10-Feb-86 22:37:14 EST
Article-I.D.: crystal.32
Posted: Mon Feb 10 22:37:14 1986
Date-Received: Wed, 12-Feb-86 21:06:28 EST
References: <599@aaec.OZ> <3676@utah-cs.UUCP>
Organization: U of Wisconsin CS Dept
Lines: 38
Summary: Courier 2400 cable

In article <3676@utah-cs.UUCP>, halff@utah-cs.UUCP (Henry M. Halff) writes:
> Here is one configuration that seems to work (at least for Red Ryder).
> 
> 	Mac	Modem
> 	1	1	Frame Ground
> 	2		No connection
> 	3	7	Signal Ground
> 	4		No Connection
> 	5	2	Data
> 	7	5	CTS
> 	8	7	(not needed)
> 	9	3	Data

I just made a cable for a USRobotics 2400; info comes from their tech
support people.

	Mac(DB9)	Modem(DB25)
	3		7	Signal Ground
	5		2	TxD+
	6		20	DTR
	7		8	CD
	9		3	RxD-
		others - NOT CONNECTED

According to Macintosh Tech Note 10 (Pinouts), pin 8 on the mac end should be
grounded to emulate RS232C; I did it, but I note that Halff@utah-cs says
it isn't necessary.

You should be able to set DIP switches on your modem to make either of these
work.

	bill
-- 
	William Cox
	Computer Sciences Department
	University of Wisconsin, Madison WI
	bill@wisc.crys.edu
	...{ihnp4,seismo,allegra}!uwvax!bill