Multi-CPU Qbus VAXen

From: Alex White <meltie_at_meltie.com>
Date: Fri Oct 10 04:19:50 2003

On Wednesday 08 Oct 2003 8:43 pm, emanuel stiebler wrote:
> Steven M Jones wrote:
> > On a related note, I there's a MicroNote about running multiple
> > MicroVAX II CPUs (KA630, M7606) in a single backplane. Up to 4
> > in fact (MicroNote #26, on www.ibiblio.org). Has anyone on the
> > list ever worked with, built, or seen such a beast? Did any
> > interesting OS research projects of the time use this feature
> > (I'm thinking V or Mach)?
>
> Check the note again. AFAIRC, this (ka630, ka650, ...) had just a
> "mailbox" register to communicate, and only one cpu had access to the
> qbus. The other ones had the qbus interface shut down. So, if you didn't
> have you special backplane with 4 qbuses, it was pretty limited ...

I've been planning a monster like this, 4 small backplanes mounted in a
hacked-around wide cabinet, 4 processors running as a VAXcluster over
Ethernet...

Been done before?

alex/melt
Received on Fri Oct 10 2003 - 04:19:50 BST