>I got an 11/83 in a rack mountable box (5 1/4"), and I would like
>to know how many of the slots are type A/B and type C/D, as I have
>a spare 11/83 cpu and a spare 1Mb mem. board, and they are
>of the types AB & C/D.
>
>The backplane is identified as H9278-A and has 8 slots.
First clue: for just about anything Q-bus, you can find the answer
in the Micronotes. They're online at
http://metalab.unc.edu/pub/academic/computer-science/history/pdp-11/
just click on "Micronotes".
What you're looking for is specifically in Micronte #5, _Q22 Compatible
Options_. It tells you
Micro/PDP-11 H9278 4 X 3 Q22/CD and 4 X 5 Q22/Q22 Backplane
In other words, just the standard BA23 backplane, the first 3 slots
are AB/CD slots, the remaining 5 are AB/AB in a serpentine pattern.
--
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 Sun May 07 2000 - 07:33:32 BST