Need help with DSSI/SCSI and an ext CD-ROM

From: Fred N. van Kempen <Fred.van.Kempen_at_microwalt.nl>
Date: Sun Oct 27 09:04:00 2002

Curt,

> On the 4000-200 on the far left side of the QBus slots is
> a slot with 2 connectors, one appears to be a standard
> SCSI-1 connector and the other is an inverse SCSI-2 connector
> (labels Bus 0) with a terminator on it that lights up on power
> up.
The first one indeed is a SCSI connector. The second one is the
DSSI bus connector, connected to bus #0. It should be terminated
(with the lighted term) unless you have an external storage cab,
which then in turn has the term.

The SCSI connector, however, is NOT usable for what you're doing.
The BA440 box (which is what your cab sounds like) has provisions
for changing its internal (DSSI) bus into a SCSI bus, for example
to be used with the KFQSA controller. That way, you can use SCSI
devices with the VAX by mounting them in the old DSSI rails.

The VAX does _NOT_ have a SCSI controller by default; unless you
have something like a KFQSA, Dilog or Emulex SCSI-to-Qbus controller,
you can NOT use the RRD43.

Sorry to be the bringer of Bad Newz (tm)..

Cheers,
        Fred
Received on Sun Oct 27 2002 - 09:04:00 GMT