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Received: by minnie.vk1xwt.ampr.org with NNTP id AA1254 ; Tue, 23 Feb 93 14:32:29 EST Newsgroups: comp.unix.bsd Path: sserve!manuel.anu.edu.au!munnari.oz.au!sgiblab!sdd.hp.com!cs.utexas.edu!hellgate.utah.edu!dog.ee.lbl.gov!overload.lbl.gov!agate!boulder!ucsu!rintintin.Colorado.EDU!galbrait From: galbrait@rintintin.Colorado.EDU (GALBRAITH JOHN) Subject: Re: I need a /dev/com3 !!! Message-ID: <1993Feb12.055229.3670@ucsu.Colorado.EDU> Sender: news@ucsu.Colorado.EDU (USENET News System) Nntp-Posting-Host: rintintin.colorado.edu Organization: University of Colorado, Boulder References: <1993Feb8.170954.25245@vlsi.polymtl.ca> Date: Fri, 12 Feb 1993 05:52:29 GMT Lines: 21 In article <1993Feb8.170954.25245@vlsi.polymtl.ca> you write: > > I just want to know if it is possible to have a third >serial communication port. And what it has to be done to have one. > I did it. The INSTALL.NOTES says that only com1 and com2 are supported, but I think the problem is sharing the interrupts. In dos, com3 shares INT4 with com1. So, set up your com3 for INT5. (If you have two parallel ports this may be a problem.) Not all serial ports support int5, like my modem. I simple had to cut the land going to the int4 and solder a short wire from the interrupt jumper to the int5 line on the ISA bus. Set com3 to the appropriate address and int5 in the kernel config file. If you need details, I can send you the bus pinout over email. john galbraith galbrait@rintintin.colorado.edu