[3400] in linux-scsi channel archive
Re: CD-ROM resets SCSI bus on Buslogic BT-958
daemon@ATHENA.MIT.EDU (Jeff Collins)
Tue Feb 24 19:48:12 1998
Date: Tue, 24 Feb 1998 13:04:07 -0800 (PST)
From: Jeff Collins <collinsj@ece.ucdavis.edu>
To: Brendan Miller <brmiller@wco.com>
cc: linux-scsi@vger.rutgers.edu
In-Reply-To: <19980223203807.02339@wco.com>
On Mon, 23 Feb 1998, Brendan Miller wrote:
> > I was having somewhat similar problems when I attempted to add a CDROM
> > burner and a SCSI tape drive to my system (a Buslogic 946 w/ 2 SCSI
> > disks). My problem turned out to be that I had been using passive
> > termination on one end of the bus. With only the 3 existing devices, I
> > didn't notice any problems. However, on trying to extend the bus, things
> > must have gotten out of spec and I started getting command timeouts and
> > the like. So, is your narrow bus passively (with resistors) or actively
> > (by jumpering to "enable termination") terminated? --jw
>
> I don't know--the ZIP drive has "Termination-On". It's a slide-switch.
> I don't know what kind of termination it provides. The other end of the
> narrow bus is the Buslogic card--supposedly, it "auto-terminates as
> necessary".
That's active termination. Termination that's enabled with software,
jumpers, or switches is active. If it were passive, you'd have 2-3 inline
resistor packs that you'd have to mess with. You don't have the problem I
described. I don't have any other brainy ideas. Good luck. --jw
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Jeff Collins, collinsj@ece.ucdavis.edu, Computer Engineering Research Lab
Electrical and Computer Engineering, The University of California, Davis
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