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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!agate!howland.reston.ans.net!wupost!csus.edu!netcom.com!duncan From: duncan@netcom.com (Donald K. Duncan) Subject: Re: patch support for Chris' com drivers ? Message-ID: <duncanC5JBo2.H6y@netcom.com> Summary: interested Organization: NETCOM On-line Communication Services (408 241-9760 guest) References: <C5D4sw.B3B@constellation.ecn.uoknor.edu> <1qdio2$mjf@walt.ee.pdx.edu> <C5I67z.3G3@agora.rain.com> Date: Thu, 15 Apr 1993 17:09:37 GMT Lines: 34 In article <C5I67z.3G3@agora.rain.com>, rgrimes@agora.rain.com (Rodney Grimes) writes: > duncan@netcom.com (Donald K. Duncan) writes: > > >In article <1qdio2$mjf@walt.ee.pdx.edu>, rgrimes@acacia (Rodney W. Grimes) writes: > >>... > >> The reason I chose IRQ2 and IRQ5 is that is what most COM boards allow as > >> alternates, not so much as what is not used. The bad thing is that shared > >>... > > >It is true that one should drive the IRQ signal correctly. A very > >simple and inexpensive way of modifying virtually ANY serial card to > >work with a shared interrupt driver such as CGD's is as follows: >... > > >It is an easy modification but just be careful. I assume no responsibility > >for fried systems. > > Easy for someone who knows what they are doing. This solution is a > "reasonable" one, though I would have to do some quick loading and timing > calculations to see if infact the ls126 and the 220 ohms are "correct" Go ahead and calculate. In the mean time I'll use the the system. I would be interested if you find out it won't work :). > My real reason for repling is to ask if their is significant interest in a > properly designed shared IRQ board and a modified driver that would support > 8 serial ports on 1 board. I have such a design in prototype form that uses I would be interested. While you are at it put a microprocessor on board to do dma rather than bogging down the main cpu. -- duncan@zycad.com (Donald Duncan - WB6QMS)