Working wide->narrow SCSI adapters?
Paul Mather
68-pin wide drive I want to use in it. Does anyone know where I can buy
a *WORKING* adapter (preferably low-profile) that will let me connect
the wide drive to the internal 50-pin SCSI bus? I stress "working"
because I mail-ordered one before, and it wouldn't work. I'm guessing
it was wired up incorrectly, as mentioned in the SCSI FAQ.
Sources willing to accept university purchase orders are a definite
plus. Low-cost is also a bonus. BTW, do I have to get an adapter with
high-byte termination, or is that unnecessary?
Thanks in advance for any help keeping this ol' DEC alive!
Cheers,
Paul.
e-mail: pa...@gromit.dlib.vt.edu
"Without music to decorate it, time is just a bunch of boring production
deadlines or dates by which bills must be paid."
--- Frank Vincent Zappa
Anders Hogrelius
>
> I have a DEC 3000/500S, which uses 50-pin narrow internal cabling, and a
> 68-pin wide drive I want to use in it. Does anyone know where I can buy
> a *WORKING* adapter (preferably low-profile) that will let me connect
> the wide drive to the internal 50-pin SCSI bus? I stress "working"
> because I mail-ordered one before, and it wouldn't work. I'm guessing
> it was wired up incorrectly, as mentioned in the SCSI FAQ.
>
located in Sweden i could at least try to find out which brand they are.
I've used a couple without problem in both my DEC 3000/300 and several of
my VAX'en. I'm actually sitting here with one in front of me, but
unfortunately there is no markings on it whatsoever, to indicate it's
manufacturer.
Did you jumper your drive correctly? I had to add two jumpers to switch
my drive from LVD to single ended mode, and from wide to narrow SCSI.
The auto mode switching of the disk didn't work. There is also another
caveat. At least with the adapters i've got, they have to be at the end of
the SCSI cable. They were all selfterminating, so adding a disk after them
on the chain with a termination on it would cause problems.
--
cheers,
/Anders
I realize that command does have its fascination, even under
circumstances such as these, but I neither enjoy the idea of command
nor am I frightened of it. It simply exists, and I will do whatever
logically needs to be done.
-- Spock, "The Galileo Seven", stardate 2812.7
*************************************************************************
* Anders Hogrelius Phone : +46 (0)70 6770210
* Tessingatan 12 E-mail: and...@hogrelius.nu
* SE-72216 Vasteras Web: http://www.hogrelius.nu/~ahs/
* SWEDEN
Shawn O'Shea
I have an AlphaServer 300 doing exactly this (9gb IBM UltraStar UW drive).
I bought an adaptor online (98% positive it has high byte termination, and
from what I've read it should to do this anyway) from www.cablemakers.com
These guys make high quality stuff (you'll pay for it though), but I've
felt it's worth it from the 1/2 dozen or so purchases I've made from them.
-Shawn
On Thu, 1 Nov 2001, Paul Mather wrote:
--------------------------------------------------------------
# ifconfig eth0.net "Shawn O'Shea" netmask 255.255.255.0 up
# route add -net smtp sh...@eth0.net
# route add -net http http://eth0.net
Carl Lowenstein
> From: Anders Hogrelius <a...@hogrelius.nu>
> To: Paul Mather <pa...@gromit.dlib.vt.edu>
> cc: <port-...@netbsd.org>
> Subject: Re: Working wide->narrow SCSI adapters?
>
> On Thu, 1 Nov 2001, Paul Mather wrote:
> >
> > I have a DEC 3000/500S, which uses 50-pin narrow internal cabling, and a
> > 68-pin wide drive I want to use in it. Does anyone know where I can buy
> > a *WORKING* adapter (preferably low-profile) that will let me connect
> > the wide drive to the internal 50-pin SCSI bus? I stress "working"
> > because I mail-ordered one before, and it wouldn't work. I'm guessing
> > it was wired up incorrectly, as mentioned in the SCSI FAQ.
> >
> located in Sweden i could at least try to find out which brand they are.
> I've used a couple without problem in both my DEC 3000/300 and several of
> my VAX'en. I'm actually sitting here with one in front of me, but
> unfortunately there is no markings on it whatsoever, to indicate it's
> manufacturer.
>
> Did you jumper your drive correctly? I had to add two jumpers to switch
> my drive from LVD to single ended mode, and from wide to narrow SCSI.
> The auto mode switching of the disk didn't work. There is also another
> caveat. At least with the adapters i've got, they have to be at the end of
> the SCSI cable. They were all selfterminating, so adding a disk after them
> on the chain with a termination on it would cause problems.
As an extra added complication, this can be drive-specific. Some
wide SCSI drives have internal pullups on the 9 extra data and
control lines, so they default to logical 0 and do not need to
be terminated when used on a narrow bus. Some drives do not.
There should be information on this in the collected archives
of newsgroup comp.periphs.scsi. It may be hard to find among all
the noise in that group. Also look at < http://www.scsifaq.org >.
carl
--
carl lowenstein marine physical lab u.c. san diego
clowe...@ucsd.edu