More SCSI Confusion

[Rob Jarratt]

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> bounces at classiccmp.org] On Behalf Of Rob Jarratt
> Sent: 18 October 2010 17:50
> To: 'General Discussion: On-Topic and Off-Topic Posts'; 'General
Discussion:
> On-Topic Posts Only'
> Subject: RE: More SCSI Confusion
> 
> > -----Original Message-----
> > From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> > bounces at classiccmp.org] On Behalf Of Mark Wickens
> > Sent: 17 October 2010 22:34
> > To: General Discussion: On-Topic Posts Only
> > Subject: Re: More SCSI Confusion
> >
> > On 17/10/10 16:32, Rob Jarratt wrote:
> > > Yes I thought about that and I tried changing it to "on" but it did
> > > not make a difference; and with the "diff" setting it does seem to
> > > work, at least some of the time.
> > >
> > > I also just found out something strange. If I remove any devices
> > > with a SCSI ID numerically lower than the CD-ROM then both the
> > > CD-ROM and the higher HDDs are still seen after the SCSI reset. To
> > > prove this I took out DKA600 and changed the SCSI ID of DKA0 to make
it
> DKA500.
> > > This time, after the reset, it recognised both the CD-ROM (ID 4) and
> > > the disk that was at ID 0 and now was at ID 5.
> > >
> > > Regards
> > >
> > > Rob
> > >
> > >
> > >> -----Original Message-----
> > >> From: cctalk-bounces at classiccmp.org [mailto:cctalk-
> > >> bounces at classiccmp.org] On Behalf Of Adrian Graham
> > >> Sent: 17 October 2010 15:17
> > >> To: General Discussion: On-Topic and Off-Topic Posts
> > >> Subject: Re: More SCSI Confusion
> > >>
> > >> On 17 October 2010 11:44, Rob Jarratt<robert.jarratt at ntlworld.com>
> > wrote:
> > >>
> > >>>>>> sh pk*
> > >>>>>>
> > >>> pka0_host_id            7
> > >>> pka0_mode               ultra
> > >>> pka0_soft_term          diff
> > >>>
> > >> The QLA1040 isn't differential is it? The soft_term should be just
> > >> 'on' I
> > >>
> > > think.
> > >
> > >> --
> > >> adrian/witchy
> > >> Owner of Binary Dinosaurs, the UK's biggest home computer collection?
> > >> www.binarydinosaurs.co.uk
> > >>
> > >
> >
> > Might be a red herring Rob, but I seem to remember certainly for the
> > BA356 integrated into the Alphaserver 1000A that the enclosure could
> > be operated in a split bus mode where half the enclosure was on one
> > bus and the other half on another.
> >
> > Just a thought (you might want to cross post this to comp.os.vms).
> >
> > Mark.
> 
> I posted this to comp.sys.dec and someone told me there about the split
> bus.
> I will check this.
> 
> Thanks
> 
> Rob

I have confirmed that it is indeed working in split bus mode. It seems I
need a BA35X-MF jumper module to get it to work in single bus mode.

Regards

Rob