21 Feb
2008
21 Feb
'08
11:05 a.m.
Perhaps someone could clarify, the manuals are less than explicit on
this. What kind of slot can the RLV12 be placed in? Does it need a
Q22/Q22, Q22/CD, does it not matter, or are there jumpers to
accommodate either?
Before I fry something I'd like to make sure I've got this right.
Thanks,
John
21 Feb
21 Feb
11:22 a.m.
Hi John,
I used this document stored over at Bitsavers when I installed my
RLV12 into my Vax 4000-200:
http://www.textfiles.com/bitsavers/pdf/dec/qbus/EK-RLV12-UG-002_Mar82.pdf
Curt
John A. Dundas III wrote:
Perhaps someone could clarify, the manuals are less
than explicit on
this. What kind of slot can the RLV12 be placed in? Does it need a
Q22/Q22, Q22/CD, does it not matter, or are there jumpers to
accommodate either?
Before I fry something I'd like to make sure I've got this right.
Thanks,
John
11:27 a.m.
On Thursday 21 February 2008 11:05, John A. Dundas III wrote:
Perhaps someone could clarify, the manuals are less
than explicit on
this. What kind of slot can the RLV12 be placed in? Does it need a
Q22/Q22, Q22/CD, does it not matter, or are there jumpers to
accommodate either?
Doesn't matter. Generally, anything that works in a Q/Q slot will work
in a Q/CD slot just fine, unless you have made some other error (like
putting it in place of 1/2 of a 2-board set that expects to have a
different board following/preceding it, though the only connections on
the 2nd set of fingers are probably grant continuity jumpers on the
RLV12, so you'll only end up breaking the stuff you installed
wrongly :).
QBUS is much more forgiving (and simple) than all the variants of slots
possible on a UNIBUS-attached backplane.
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
6:28 p.m.
Thanks to all for your comments.
This is being used temporarily in a system with an M8189 (KDF11) and
M7551 (MSV11-Q, 4MB memory), so only one CD slot is currently
available. Just wondered whether I needed to reserve that slot or
not. Looks like not, so I'll use an appropriate Q/Q slot.
Thanks,
John
9:22 p.m.
John A. Dundas III wrote:
Thanks to all for your comments.
This is being used temporarily in a system with an M8189 (KDF11) and
M7551 (MSV11-Q, 4MB memory), so only one CD slot is currently
available. Just wondered whether I needed to reserve that slot or
not. Looks like not, so I'll use an appropriate Q/Q slot.
Remember that if you use a dual board in the 3rd slot, the CD portion is left empty!!
Also, you can't just leave the 3rd slot empty, there must be at least a bus grant card
-
I assume that you will have at the very least a disk controller present!
And the other five AB /AB slots are serpentine - which means that the bus grant winds
from:
Slot 4: left to right /
Slot 5: right to left /
Slot 6: left to right /
Slot 7: right to left /
Slot 8: left to right
Sincerely yours,
Jerome Fine
5972
days inactive
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4 comments
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participants (4)
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curt＠atarimuseum.com -
dundas＠caltech.edu -
jhfinedp3k＠compsys.to -
pat＠computer-refuge.org