Path: utzoo!news-server.csri.toronto.edu!rpi!usc!cs.utexas.edu!sun-barr!ames!dftsrv!mimsy!mojo!russotto
From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Hardware Handshaking on Mac Plus (or new macs)
Message-ID: <1991Mar18.051313.1435@eng.umd.edu>
Date: 18 Mar 91 05:13:13 GMT
References: <78Ryy2w162w@alchemy.tcnet.ithaca.ny.us>
Sender: news@eng.umd.edu (C-News)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 20

In article <78Ryy2w162w@alchemy.tcnet.ithaca.ny.us> sethcohn@alchemy.tcnet.ithaca.ny.us (seth cohn) writes:
>ok, HOW can you do Hardware handshaking on a mac plus?
>(or on a Classic, LC, or Si)  None of these has Pin 7
>(known as GPi or general Purpose input)  hooked up
>(apple got cheap and figured it wasn't neccessary)
>thus you can hook up hardware handshaking but you lose carrier detect
>(which is not acceptable!!!)
>Can you use pin 8 - which is the extra receive pin
>for carrier detect if the software is right????
>if not, any other way???

No, you can't use the RxD+ line.  What software do you have that gets CD on
Pin 7?  And why would you need CD if you aren't doing a BBS?
BTW, the SE, SE/30, IIx, II, IIcx, IIfx, and IIci all have pin 7--
are you sure the Classic, LC, and SI don't?
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.
I mine 600 wells, and whaddo I get?  Another day older and deeper in debt!
	--- Saddam Hussein.