H9278-A is this Q/CD or Q/Q

From: CLASSICCMP_at_trailing-edge.com <(CLASSICCMP_at_trailing-edge.com)>
Date: Fri Dec 17 20:47:00 1999

>The backplane is marked Micro-11 and H9278-A which is described as:
> Q22 BUS BACKPLANE, 8 QUAD SLOTS
>
>Which sounds a whole lot like Q/CD all the way down to me. Anyone know for
>sure? I'll be trying it out shortly so I may figure it out empirically. :-)

You want to look at Micronote #5, "Q22 Compatible Options", for the
straight scoop. If you want to look at it over the web, start at the
Micronote index at

  http://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/hardware/micronotes/numerical/

In there you'll see the H9278 classified as

        Micro/PDP-11 H9278 4 X 3 Q22/CD and 4 X 5 Q22/Q22 Backplane

In other words, this is your bog-standard BA23 backplane. The first three
slots are CD, and the rest are serpentine.

-- 
 Tim Shoppa                        Email: shoppa_at_trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927
Received on Fri Dec 17 1999 - 20:47:00 GMT

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