16 May
2012
16 May
'12
5:38 a.m.
Hi,
someone wrote on this list, that the Disk distribution Paneel that is
mounted on the Back of the Backplane from some 11's are faulty and
will destroy data from the disks if two are connected.
I cn't find the posting now...
What kind of (wiring-) fault is this? Are there Fixes known?
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
16 May
16 May
12:11 p.m.
On 16/05/2012 13:38, Holm Tiffe wrote:
Hi,
someone wrote on this list, that the Disk distribution Paneel that is
mounted on the Back of the Backplane from some 11's are faulty and
will destroy data from the disks if two are connected.
I cn't find the posting now...
What kind of (wiring-) fault is this? Are there Fixes known?
It's /not/ a wiring fault. The H9278 is the backplane for a BA23, and
the 34-way connectors are wired as a bus in the standard way. This
means if you plug in two drives, you must set them to be different drive
selects, as documented in several DEC manuals for that backplane/box.
If you don't do that, but plug in two drives which are set to use the
same selects (eg both set to DS0, or both set to DS1) they will both be
selected at the same time, and that will cause trouble.
--
Pete Peter Turnbull
Network Manager
University of York
17 May
17 May
12:03 a.m.
Pete Turnbull wrote:
On 16/05/2012 13:38, Holm Tiffe wrote:
Ahh, ok.
So there is no real problem.
They just routed that 34-way bus like it should be. The same is on the
Floppy side, I prefer to set the right jumpers and be able to use 4 drives
on a shugart bus as to have those ugly PeeCee modifications.
You have just to know what you are doing, thats all.
I do have an Z8000 (comaptible, east german) Unix machine, the same here.
Regards,
Holm
--
Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe,
Freiberger Stra?e 42, 09600 Obersch?na, USt-Id: DE253710583
www.tsht.de, info at tsht.de, Fax +49 3731 74200, Mobil: 0172 8790 741
Hi,
someone wrote on this list, that the Disk distribution Paneel that is
mounted on the Back of the Backplane from some 11's are faulty and
will destroy data from the disks if two are connected.
I cn't find the posting now...
What kind of (wiring-) fault is this? Are there Fixes known?
It's /not/ a wiring fault. The H9278 is the backplane for a BA23, and
the 34-way connectors are wired as a bus in the standard way. This
means if you plug in two drives, you must set them to be different drive
selects, as documented in several DEC manuals for that backplane/box.
If you don't do that, but plug in two drives which are set to use the
same selects (eg both set to DS0, or both set to DS1) they will both be
selected at the same time, and that will cause trouble.
--
Pete Peter Turnbull
Network Manager
University of York
10:01 a.m.
On 17/05/2012 08:03, Holm Tiffe wrote:
>> someone wrote on this list, that the Disk
distribution Paneel that is
>> mounted on the Back of the Backplane from some 11's are faulty and
>> will destroy data from the disks if two are connected.
>> I cn't find the posting now...
>>
>> What kind of (wiring-) fault is this? Are there Fixes known?
> It's /not/ a wiring fault. The H9278 is the
backplane for a BA23, and
> the 34-way connectors are wired as a bus in the standard way. This
> means if you plug in two drives, you must set them to be different drive
> selects, as documented in several DEC manuals for that backplane/box.
>
> If you don't do that, but plug in two drives which are set to use the
> same selects (eg both set to DS0, or both set to DS1) they will both be
> selected at the same time, and that will cause trouble.
They just routed that 34-way bus like it should be.
Indeed :-)
You have just to know what you are doing, thats all.
Exactly :-)
--
Pete Peter Turnbull
Network Manager
University of York
4554
days inactive
4555
days old
3 comments
2 participants
participants (2)
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holm＠freibergnet.de -
pete＠dunnington.plus.com