Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!batcomputer!alchemy!sethcohn Newsgroups: comp.sys.mac.hardware Subject: Re: Hardware Handshaking on Mac Plus (or new macs) From: sethcohn@alchemy.tcnet.ithaca.ny.us (seth cohn) Message-ID: References: <1991Mar18.051313.1435@eng.umd.edu> Date: Mon, 18 Mar 91 20:16:36 EST Organization: Alchemy International, Ithaca, N.Y. russotto@eng.umd.edu (Matthew T. Russotto) writes: > In article <78Ryy2w162w@alchemy.tcnet.ithaca.ny.us> sethcohn@alchemy.tcnet.it > >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 > I mine 600 wells, and whaddo I get? Another day older and deeper in debt! 1) Yes, I AM running a bbs, so I DO need carrier detect (sorry that wasn't clear in the first post) 2) Yes, Pin 7 is used for carrier detect. WHY can't you use pin 8? it's currently grounded. 3) according to APPLE specs (as of the latest service tech manual i just got - "Not connected on Macintosh Plus, classic, LC, or IISi" Hmm, anybody got any ideas? Handshaking is important for REAL speed I'm going to be using a US Robotics HST DS with v32bis. Seth Your Friendly Tech, what the heck. Seth Cohn, Service Tech. 607-273-2815 voice 607-272-7002 BBS All things posted are opinions by me, of me, for me, or to me. And another thing..........I'm not sure you're real.