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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.cs.su.oz.au!metro!metro!munnari.OZ.AU!spool.mu.edu!uwm.edu!math.ohio-state.edu!howland.erols.net!newsfeed.internetmci.com!btnet!netcom.net.uk!nntpfeed.doc.ic.ac.uk!sunsite.doc.ic.ac.uk!cs.city.ac.uk!not-for-mail From: adm2@sarc.city.ac.uk (Alan Messer) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Serial ports and internal modems.. Date: 26 Nov 1996 16:39:05 GMT Organization: Systems Architecture Research Centre, City University, London, UK. Lines: 35 Message-ID: <57f6f9$ffh@bambam.soi.city.ac.uk> NNTP-Posting-Host: tempest.sarc.city.ac.uk X-Newsreader: TIN [UNIX 1.3 950621BETA PL0] Hiya, My machine comes with 2 serial ports as one would expect sitting on the usual IO addresses and interrupts (3 & 4).. Just recently I've brought an internal modem for the machine which has a config to make the modem act as either COM1-4.. no problem I thinks and I configured the port to COM4 for the internal modem.. My understanding of this is that it uses a slightly different IO address to COM2, but the same interrupt.. Before placing this on my machine I tried it with no problems under my brother's Win95 machine.. No problems.. Now I've come to configure my FreeBSD (2.1.0) box to use the modem.. I placed a sio line in the config for COM4 and the same interrupt and recompiled the kernel.. But the new port isn't recognised.. COM3 neither. On reading the FAQ/Handbook in closer detail it reveals that serial ports can't use the same interrupt.. Yet, under DOS this would seen to be the norm.. So what gives? The internal modem has no config to move the interrupt (well that's not quite true there are 6 or 7 dips but with no more documentation than 4 settings for the different COM combinations).. And my BIOS/motherboard don't allow the interrupts to be changed.. Any ideas? The internal modem is a plain OEM 33.6 modem using the usual rockwell chipset.. Alan. -- Alan Messer | Email: adm2@sarc.city.ac.uk. Systems Arch., I-Op Research Centre, | Tel: +44 171 477 8551 City University, London, EC1V 0HB | Fax: +44 171 477 8587 URL: http://www.cs.city.ac.uk/homes/adm2/