Small DEC cardcage with backplane

7 Mar 2015

...
 Jon Elson wrote: 
...
  On 03/06/2015
11:30 AM, Pontus Pihlgren wrote: 
  On Fri,
Mar 06, 2015 at 10:28:57AM -0600, Jon Elson wrote: 
  On
03/05/2015 05:00 PM, Sander Reiche wrote: 
  Hi all,

 I'm currently searching around for a small cardcage+backplane, if 
 I'm not
 mistaken DEC part numbers H9281-BA or H9281-BB for a bigger one. 
 The -BA
 (4x dual heights) has my preference as I'm looking to build a very 
 nice,
 cute and not that power hungry PDP-11.  
 Unibus or Q-bus?  I have some Q-bus backplanes that came from the
 WELL.
 Picked them up at some surplus place in the bay area, I think
 probably Mike
 Quinn's.

 The backplanes don't have a manufacturer's label.  They may have
 been custom
 made by the WELL, I don't know.  I also don't know if they are Q-18
 or Q-22.
 They have a card cage, cooling fan and Todd power supply.  I have
 two of them.

 Jon 
 What size?  
 9 slots x 4 connectors wide.  Standard Q-bus. 
If I remember correctly, a 9 slot x 4 connectors wide are ABCD and
available with support for either 18-bit or 22-bit addresses.  The
last slot usually expects a terminator board.  I can't remember the
actual part numbers.

There are also more recent backplanes in a BA23 box which are
8 slots by 4 connectors wide.  The BA23 box also contains bays
for 2 * 5 1/4" drives, one of which is usually an MSCP drive for
which there is a distribution panel at the rear of the drive bay
that is connected to an RQDX1, RQDX2 or an RQDX3 via a
50 pin cable.  The first 3 slots and ABCD and the remaining
5 slots are ABAB.  There were many, many BA23 boxes sold
and they may be easier to find.

Jerome Fine

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Small DEC cardcage with backplane