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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!constellation!osuunx.ucc.okstate.edu!moe.ksu.ksu.edu!crcnis1.unl.edu!wupost!uunet!world!hd From: hd@world.std.com (HD Associates) Subject: Re: Elusive SCSI problems (Adaptec 1542C) <snarl!> Message-ID: <C70nBJ.387@world.std.com> Keywords: Adaptec 1542C, Quantum, SCSI, 386bsd Organization: The World Public Access UNIX, Brookline, MA References: <1993May12.023959.20121@sophia.smith.edu> <1993May14.004015.23497@sophia.smith.edu> <hastyC708F2.CGH@netcom.com> Date: Fri, 14 May 1993 12:14:07 GMT Lines: 69 In article <hastyC708F2.CGH@netcom.com> hasty@netcom.com (Amancio Hasty Jr) writes: >Try to leave the last device on your scsci unterminated. > >I had problems with my toshiba 1.2g and the 1542c very similar to your >problem so I took the drive and the 1542c back to the store. >they also couldn't get it to work. However one the techies found >out that with some drives the last device should be left unterminated or >the adaptec unterminated and the last drive terminated. > >With the disk drive unterminated and the adaptec 1542c terminated my system >has been working like a charm. This was in comp.periphs.scsi: >From: nauck@ibr.cs.tu-bs.de (Detlef Nauck) >Subject: Write errors on external connector of Adaptec's 1542C ? >Message-ID: <1993May12.114233.18318@ibr.cs.tu-bs.de> >Originator: nauck@neuro.ibr.cs.tu-bs.de >Sender: postnntp@ibr.cs.tu-bs.de (Mr. Nntp Inews Entry) >Reply-To: nauck@ibr.cs.tu-bs.de (Detlef Nauck) >Organization: TU Braunschweig, Informatik (Bueltenweg), Germany >Date: Wed, 12 May 1993 11:42:33 GMT >Lines: 37 > > >Hi, > >two days ago I read in a german computer magazine (c't 6/93) that the new >Adaptec 1542C has a bug concerning devices at the external connector. > >It says, when you use it without the ASPI interface you can get write >errors when you transfer large blocks. You won`t notice that before you >do a seperate compare run. > >This happens e.g. when you use tapes under UNIX. You don't notice this bug as >long as you are using DOS and the ASPISYS drivers because internal hard drives >are not concerned, and the drivers include a workaround. That means Adaptec >knew of this error before selling the piece (says the mag). > >The magazine states that Adaptec has not yet determined what to do, e.g. >call back all adapters or give a free replacement to people who have the need. > >That article just stopped me from running to my computer shop to buy the 1542C. >I have to make a decision in the next few days, and I really like to get >the adapter, because I think it's a good piece of hardware if you forget >about this bug. But I want to use Linux in the future, and I am not sure what >this bug will mean to me some day. > >Yesterday I asked in a computer shop if there will be a solution. They said >that there will be some kind of exchange, but they couldn't tell me when and >how. > >Has anybody out there more information how serious this bug is? Are there >workarounds under UNIX? Any information on what Adaptec will do? > >Detlef. As I mentioned in a previous post, I also have problems if I don't use illegal termination configurations. Yesterday I was trying to use an old Seagate drive for some testing and found I had to change the termination to get it to work - that is, though I had a stable working setup (by leaving the 1542C terminated when I shouldn't) I had to change things when I added different external peripherals. And the 1542B works flawlessly with all these devices. I wish I had a scope here in the office. Peter Dufault HD Associates