DEC QBUS Backplanes

Anders Nelson anders.k.nelson at
Fri Apr 17 11:57:17 CDT 2020

Just curious - in all the backplane photos I've seen, it appears the
fragile wire wrapping is always exposed without a cover protecting it from
other components, fallen screws and wayward fingers in the computer cabinet.

Was it ever standard practice to put a cover over these? I couldn't imagine
debugging or repairing a backplane...

Anders Nelson

On Fri, Apr 17, 2020 at 12:52 PM Bill Gunshannon via cctalk <
cctalk at> 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.
> bill

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