Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site rlgvax.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!zehntel!dual!qantel!intelca!hplabs!hao!seismo!rlgvax!guy From: guy@rlgvax.UUCP (Guy Harris) Newsgroups: net.unix-wizards Subject: Re: Autobaud Modems Message-ID: <294@rlgvax.UUCP> Date: Tue, 11-Dec-84 18:17:11 EST Article-I.D.: rlgvax.294 Posted: Tue Dec 11 18:17:11 1984 Date-Received: Sat, 15-Dec-84 00:12:26 EST References: <32300009@smu.UUCP> Organization: CCI Office Systems Group, Reston, VA Lines: 18 > Some time ago there was a lot of debate about auto-baud modems > and different ways to do them. The solutions were all done totally > in software. This solution uses hardware to aid the software and > the only problems with it is that it can only be used at two > speeds. Typically the speeds are 1200 and 300. > > The concept is quite simple. The ring detect line is not used for > anything usefull (at least in the DH driver on a 4.2 system). Most > autobaud modems have a speed line availiable on the RS-232 connector. > So it is simply a matter of connecting the speed line of the modem > to the ring detect line of the DH. If I remember correctly, there was stuff in V7 to do exactly that on a DH (there was also stuff in V7 to adaptively set the silo alarm level on DHes, and that wasn't in 4.xBSD either). Guy Harris {seismo,ihnp4,allegra}!rlgvax!guy