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#! rnews 2325 bsd 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!howland.erols.net!worldnet.att.net!newsadm From: "J.C. Archambeau" <n-xiv@worldnet.att.net> Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: strange message from SCSI ahc driver at boot Date: 31 May 1997 00:54:51 GMT Organization: AT&T WorldNet Services Lines: 39 Message-ID: <01bc6d5d$ed5ccf80$b1ed93cf@worldnet.worldnet.att.net> References: <338D5018.3BFF@we.lc.ehu.es> <01bc6c5c$550c6d00$b5cc93cf@worldnet.worldnet.att.net> <338ED3D3.41C67EA6@we.lc.ehu.es> <5mn8br$eid$1@sol.ctr.columbia.edu> NNTP-Posting-Host: 207.147.206.132 X-Newsreader: Microsoft Internet News 4.70.1155 Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:41950 Bill Paul <wpaul@ctr.columbia.edu> wrote: : It means target 5 on channel A of controller ahc0. The ahc driver supports : certain Adaptec cards that have two channels: one internal (you attach : devices with a 50-pin ribbon cable) and one external (there's a 50-pin : mini SCSI2 'D' connector on the part of the card that sticks out the : back of the computer). Actually, the dual channel Adaptec narrow SCSI cards have a pair of 50-pin IDS (ribbon) connectors and one HPDB-50M. At least that's what my 2742A-Twin has. The external port that attaches to the bracket plate is for channel A. If you want an external port for channel B you need to get your own adapter bracket or cable and put it at the end of the ribbon cable used for channel B. : Each channel is a seperate SCSI bus that can : support up to 7 SCSI devices. In effect, it is like having two SCSI : host adapter cards in one package. The 'A' violates the BSD device ID : convention to a certain extent since normally controllers/busses/devices : are numbered rather than lettered. Probably the Adaptec documentation : refers to the busses as channel A and channel B, so the driver author : used that nomenclature in the debug and probe messages. It also doesn't correspond to other usage of dual channel adapters. Under other OSes (I won't mention that evil W word), it just refers to each channel as a seperate adapter. Anyway, thanks for the clarification. It acutally makes sense if you stop and think about it albeit being undocumented. JCA -- n-xiv@worldnet.att.net