Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!spool.mu.edu!news.cs.indiana.edu!widener!iggy.GW.Vitalink.COM!pacbell.com!att!ucbvax!UCBVAX.BERKELEY.EDU!"Dan Karron From: Dan Karron@UCBVAX.BERKELEY.EDU Newsgroups: comp.sys.sgi Subject: RE: Serial Ports, DTR and RTS/CTS Message-ID: <9104040120.AA04383@karron.med.nyu.edu> Date: 4 Apr 91 01:20:06 GMT Article-I.D.: karron.9104040120.AA04383 Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: karron@cmcl2.nyu.edu Organization: The Internet Lines: 28 Dave Marks (marks@aivax.radc.af.mil) writes: >I want to connect 3 modems (actually NIU ports, but they LOOK and ACT like >modems) to our 4D/70GT (soon to be a 4D/340VGX). We have the 6 serial port >expansion interface, but those ports don't support DTR for detecting presence >of a connection; an attribute we require. Ports 1-4 support DTR, but 2 and 3 >are dedicated to the Buttons & Dials Box and the SpaceBall. I had a 70G machine, and I maintain that serial io is not right on that class machine. I had to move to a newer machine (85) for all the serial io problems to clear up. My advice is to wait until you get your 340VGX machine. The design intent is that all the serial ports are wired the same, but that is not the case for the 70 machines, despite what all the fe's say. If you are using Ungermann-Bass NIU's, you are in for more grief. I am surprised that the serial expansion ports don't support hardware handshake. You need it for fast (>9600 baud) io. Cheers! dan. | karron@nyu.edu (e-mail alias ) Dan Karron, Research Associate | | Phone: 212 263 5210 Fax: 212 263 7190 New York University Medical Center | | 560 First Avenue Digital Pager <1> (212) 397 9330 | | New York, New York 10016 <2> 10896 <3> |