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From: bartling@cyrix.com (Steve Bartling)
Message-Id: <199708262147.QAA16387@mega.eng.cyrix.com>
Subject: Re: Freebsd2.2.2, adaptec 1742A and Ultra SCSI drive
To: wilko@yedi.iaf.nl (Wilko Bulte)
Date: Tue, 26 Aug 1997 16:47:00 -0500 (CDT)
Cc: bartling@cyrix.com, gibbs@plutotech.com, freebsd-scsi@FreeBSD.ORG,
        dietz@cyrix.com, gregg@cyrix.com
In-Reply-To: <199708261726.TAA00962@yedi.iaf.nl> from "Wilko Bulte" at Aug 26, 97 07:26:27 pm
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> 
> As Steve Bartling wrote...
> > 
> > > 
> > > >I replaced a defective Micropolis 2217 1.7 Gig Fast SCSI-2
> > > >drive with a new ultra scsi Micropolis 4743NS.
> > > 
> > > You may want to try playing around with mode page two on
> > > the drive.  I remeber that the Atlas I wouldn't work on the 1742A
> > > unless you slowed it down a little bit.  It seems that if you
> > > cut your bus signal times close to the minimum the spec allows,
> > > the 1742 becomes confused.  There is probably a FAQ entry
> 
> 174x are somewhat notorious for being sensitive to fast glitches etc
> on the SCSI bus. For one thing it is really advisable to use the
> internal OR the external bus connector but not both. 
> 
> We had some fun with this in the original AlphaPC (the Jensen aka
> DEC 2000/300)
> 
> I never had this particular problem myself on an Intel box with the
> 174x but I have to admit your disk is much newer/faster than the
> old stuff I use on the 174x based test box here.
> 
> Wilko
> _     ____________________________________________________________________
>  |   / o / /  _  Bulte  email: wilko@yedi.iaf.nl http://www.tcja.nl/~wilko
>  |/|/ / / /( (_) Arnhem, The Netherlands - Do, or do not. There is no 'try'
> ----------------------------------------------------------------------Yoda
> 

Hi Wilko,

The 1742A with the latest Adaptec BIOS has been rock solid for
every peripheral I have thrown at it for about 5 years. 

Recently, I had all seven ID's taken up. 4 internal devices and
three external ones. I have mixed and matched scsi devices
up and down the scsi cable and I have never had any problems.

Once, I had a bad passive terminator at the end of the external scsi
bus, but that was easy to diagnose and fix. 

The 1742 bios was rev'ed a lot in the early days of the 1742. If you
have an older board, you will experience lots of wierd behavior.
Some devices will work only when they are the third device on
the scsi cable, etc ...

Adaptec cured most of those problems through firmware modifications.
Try accessing their ftp site at ftp://ftp.adaptec.com. Their 
latest 1742 Bios can be found there. Use the 1742XAS.EXE version
( the 1742XA version is corrupted ).

I replaced my bios a couple of years ago and life has been good
to me until last week :-)

- Steven Bartling