Two VAXes sharing the one BA11!!!

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Article #4309

#4309

From: Huw Davies
Date: Wed, 06 Jan 1993 10:20

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As part of a project I'm involved with at work to use a 780 and 785 as
backend processors for our soon to arrive Alpha system I have ended up
with the two VAX systems sharing one BA11 (the other BA11 was 110V and
made nice white smoke when used at 240V :-).

The two systems are up and running, but there is one little problem
(there's always one little problem :-). Unless both VAX processors are
powered up, the devices in the BA11 appear invisible to the VAX
that's running. From my understanding of the wiring of the parts of the
BA11 backplane, the only signals passed through relate to power supply,
not logic. Can anyone shed any light on this?
-- 
  Huw Davies           | Huw.Davies@latrobe.edu.au
  Computing Services   | Phone: +61 3 479 1500   Fax: +61 3 479 1999
  La Trobe University  | I own an Alfa to keep me poor in a monetary
  Melbourne Australia  | sense, but rich in so many other ways

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Message-ID: <1993Jan6.102059.29154@lugb.latrobe.edu.au>

Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!ariel.ucs.unimelb.EDU.AU!ucsvc.ucs.unimelb.edu.au!lugb!lucifer!cchd

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Path: arc1-ca.pugleaf.net!sparky!uunet!munnari.oz.au!ariel.ucs.unimelb.EDU.AU!ucsvc.ucs.unimelb.edu.au!lugb!lucifer!cchd
Newsgroups: comp.sys.dec,comp.os.vms,vmsnet.pdp-11
Subject: Two VAXes sharing the one BA11!!!
Message-ID: <1993Jan6.102059.29154@lugb.latrobe.edu.au>
From: cchd@lucifer.latrobe.edu.au (Huw Davies)
Date: Wed, 6 Jan 1993 10:20:59 GMT
Sender: news@lugb.latrobe.edu.au (USENET News System)
Organization: La Trobe University
Keywords: BA11 VAX Unsupported
Lines: 16