Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!udel!rochester!pt.cs.cmu.edu!o.gp.cs.cmu.edu!andrew.cmu.edu!gh1w+ From: gh1w+@andrew.cmu.edu (Gregory A. Haverkamp) Newsgroups: comp.sys.apple2 Subject: Re: Comm between two computers? Message-ID: Date: 10 May 91 18:53:59 GMT References: <9105100201.AA16988@apple.com> Organization: Carnegie Mellon, Pittsburgh, PA Lines: 37 In-Reply-To: <9105100201.AA16988@apple.com> KMILES@AARDVARK.UCS.UOKNOR.EDU ("Kurt W. Miles 329-7303", 405) writes: >> Here is the question: How can I make computer 1 and computer 2 talk to each other via modem? I have tried running the phone line from modem to modem, but they only whistle at each other, and never answer. I have tried all the ideas I could come up with (ATA and ATO, ATA and ATA, etc), but I am stumped. << Kurt, here's what I think you're problem is: you have to convince the modems that they are actually on a phone line - I've seen this problem before doing some programming of modem-playable games. First, and I don't know how legal this is, try to find a loop in your area. They usually hang around the end of the telephone prefixes and have numbers such as 9898 and 9899. I don't remember the specifics anymore (it has been a long time since the days I cared), but one is a closed end, the other is the open end. One of these will emit a high frequency tone, the other will remain silent. Using the silent end, simply call this number, and both modems will think they're online to another modem (they're not overly bright). Connect them at this point. You'll need something like a y-jack to do this. Plug it into the outlet and the modems into either socket of the y-jack. Second, and let me see if I can remember how we pulled this off, hook the two up in the way described above. Now, if you take the phone off the hook (either modem should be able to do this with this connection), most phone systems will start giving that obnoxious reorder signal. However, after several minutes (5 to 10 or less, as I recall), the line will just sit quiet. As far as the modems will know, they will be connected to another modem across the country. Hope this helps. Greg gh1w@andrew.cmu.edu