DEC QBUS Backplanes
bill.gunshannon at hotmail.com
Fri Apr 17 15:37:05 CDT 2020
On 4/17/20 4:05 PM, Glen Slick via cctalk wrote:
> On Fri, Apr 17, 2020 at 9:52 AM Bill Gunshannon via cctalk
> <cctalk at classiccmp.org> wrote:
>> I have been sorting thru a bunch of stuff in an effort to
>> clean the place up (Aren't we all doing that now with all
>> this time on our hands?) I found a backplane. It says
>> Digital on it but does not have an H- number. I also
>> don;t find it listed in any of the lists I can find on
>> the web.
>> It has 8 A-B slots and 4 C-D slots. the Four C-D are on
>> the bottom half of the backplane. I am assuming it is
>> 18 bit and the C-D were intended for things like the 2
>> board RL controller.
>> Anybody familiar with this and able to identify it?
>> Anybody interested in it? It should fit in a USPS
>> Medium Flat Rate Box.
> Sounds similar to a BA123 backplane which has 4 Q22/CD slots and 8
> Q22/Q22 slots.
> But the BA123 is rather distinctive with a gap then a 13th slot where
> the M9058 Signal Distribution Board for the M7555 RQDX3 is installed.
> For example BA123 backplane part number 54-17507-01 / 50-17506-01
Definitely not that. Very small. Just big enough for the
slots I mentioned above. Power strip on one edge and berg
pins for control on the other.
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