Received: (from major@localhost)
	by minnie.cs.adfa.edu.au (8.9.1/8.9.1) id IAA27264
	for pups-liszt; Fri, 4 Dec 1998 08:36:51 +1100 (EST)
Received: from mgate.nwnexus.com (mgate.nwnexus.com [206.63.63.200])
	by minnie.cs.adfa.edu.au (8.9.1/8.9.1) with ESMTP id IAA27258
	for <pups@minnie.cs.adfa.edu.au>; Fri, 4 Dec 1998 08:36:42 +1100 (EST)
Received: from halcyon.com (66-a-usw.rb1.blv.nwnexus.net [206.63.251.66])
	by mgate.nwnexus.com (8.8.8/8.8.8) with ESMTP id NAA25750
	for <pups@minnie.cs.adfa.edu.au>; Thu, 3 Dec 1998 13:36:22 -0800
Message-ID: <36670437.966A4527@halcyon.com>
Date: Thu, 03 Dec 1998 13:35:51 -0800
From: "David C. Jenner" <djenner@halcyon.com>
Reply-To: djenner@halcyon.com
X-Mailer: Mozilla 4.5 [en] (Win98; U)
X-Accept-Language: en
MIME-Version: 1.0
To: PDP-11 Unix Preservation Society <pups@minnie.cs.adfa.edu.au>
Subject: Re: System Industries MSCP disk controller problem
References: <199812032008.BAA08080@harrier.Uznet.NET>
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Sender: owner-pups@minnie.cs.adfa.edu.au
Precedence: bulk

> > The sigma 5.25" 9-slot backplanes have very different backplane
> > wirings (and, indeed, putting a DEC dual-wide Microvax CPU into
> > it will very likely cause damage.)
> 
>    Yes, I know. The yellow sticker on the expansion backplane says:
> "CAUTION! Do not install MicroVAX or KDJ11-B series CPUs into this
> backplane."

I have a box with one of these.  I noticed the bussing appeared to
be non-standard, but exactly what is the problem here?

I also have a couple of Netcom HV1148 backplanes that
appear to be non-standard.  Any experience with these?

What can you do with these backplane?  What sort of Q-Bus system
can you use them in?

Thanks,
Dave