3 ways are great for SCSI 1,2 & 3, but remember, you MUST have one that is
labeled LVD or it won't work right with Ultra2 (80) or Ultra3 (160) SCSI
(different setup slightly). I get one too many customers not realizing this
when they pick one up at the store I work at ("Oh, it's that 68 pin thing,
that's all it really is, I don't need that LV-something thing." - later
turning out to be Ultra2 or 3).
-John Boffemmyer IV
At 10:05 AM 6/9/02, you wrote:
>You're right, of course, but it's also possible to configure your wide SCSI
>devices to work on a narrow controller. I have that configuration working
>with SCA devices, which make it somewhat easier (at least less costly) but
>it's necessary that you consult the documentation for your wide drives to see
>about configuration details. The drives (several types) that I have all allow
>for "narrow" configuration with a single jumper. That's necessary, but not
>sufficient, since you also need the adapter cable, or an adapter board. If
>you configure the drive for narrow transfers, I doubt it matters whether you
>terminate the upper part of the bus appropriately, but if you have the option,
>I'd terminate the upper bus anyway.
>
>If you don't have an adapter and can't find one that's cheap enough, you could
>use one of the 3-way adapters that abound on the web for attaching SCA drives
>to a WIDE controller or a Narrow controller. There are at least three types,
>and what you want is the one that has BOTH the wide and narrow connectors.
>You're not required to use the SCA connector, though that's how the boards are
>intended to be used, and can then connect both a WIDE cable and a NARROW cable
>to the board, presumably with the NARROW cable going to your controller. I've
>done this with complete success, so you should have no trouble.
>
>Dick
>
>----- Original Message -----
>From: "Bob Lafleur" <bob_lafleur_at_technologist.com>
>To: <cctalk_at_classiccmp.org>
>Sent: Saturday, June 08, 2002 10:18 PM
>Subject: 50 & 68 pin SCSI-2
>
>
> > I've got 50-pin SCSI-2 connectors inside my MicroVAX 3100. Is there a
> > way to use 68-pin devices? The RZ26L and RZ28's in it are 50-pin, but I
> > have some RZ29's that are 68-pin and I'm wondering if there is in
> > adapter? I suspect not, but just asking.
> >
> > If I'm not mistaken, it is possible to "go the other way" and use 50-pin
> > devices on a 68-pin cable with an adapter that terminates that "extra"
> > lines, correct?
> >
> > - Bob
> >
> >
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Received on Sun Jun 09 2002 - 18:31:26 BST