[4239] in linux-scsi channel archive
SCSI confusion
daemon@ATHENA.MIT.EDU (McGee, Chris)
Sat Jun 27 13:00:19 1998
From: "McGee, Chris" <CMMcGee@Pella.com>
To: "'linux-scsi@vger.rutgers.edu'" <linux-scsi@vger.rutgers.edu>
Date: Sat, 27 Jun 1998 11:51:26 -0500
Hallo-
I recently dug up a couple really old Seagate SCSI drives, and
was confused by the termination jumpers. There are a series of resistor
packs that you can insert or remove to terminate or unterminate the
drive, and that seems simple enough, but there are also three jumpers
labelled "Terminator power +5v from the Bus", "Terminator power +5v from
Drive", and "Terminator power +5v to the Bus".
What should these be set to for terminated/unterminated? Would
anyone care to explain the mechanics of single-ended SCSI termination?
If I understand it right, the idea behind termination is simply to
terminate every signal in a resistor to avoid reflected noise on the
SCSI chain...
If anyone is curious/in need of a laugh, the machine I have is
an $5000 HP network server from the days when the 486/33 was the fastest
thing going :) EISA Adaptec 1740 (this is a BIIIIG card!), running
Linux 2.0.34. I have two disks on the internal bus, and the second one
kills the OS any time you access it. It's new (sat in a box in a closet
for years and years. When's the last time YOU opened a brand-spanking
new 440 MB 5.25", full height SCSI drive? :) ), so I think I must have
some form of user error going :)
Thanks!
--Chris
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.rutgers.edu
