Multi-CPU Qbus VAXen

From: emanuel stiebler <>
Date: Wed Oct 8 14:43:25 2003

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 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 ...

Received on Wed Oct 08 2003 - 14:43:25 BST

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