On Sun, 7 Oct 2001, Dave McGuire wrote:

> On October 7, Anders Magnusson wrote:
> > The 782 is in principle two 780's, each of them with separate IO devices,
> > separate memory etc but with some shared memory (in a separate box) to
> > make the two machines to be able to communicate with each other. The
> > shared memory is intended only to send messages between the two machines,
> > it's slow and normally very little memory. Its intended usage is something
> > like the SYSVSHM that communicate between processes.
> > 
> > So, the 782 machine is just two "normal" single-CPU machines that can talk
> > to each other faster than over network. I know Mach was ported to that type
> > of VAXen but I think that was only for testing purposes to see if the Mach
> > concept worked on it. It wouldn't be realistic to try to port NetBSD to it.
> 
>   Given that, it might be better to think of the 782 as a
> "configuration" of two 780s with a shared memory option rather than a
> separate model of VAX in its own right.

My memory is a bit fuzzy, but I'm not sure this is correct.

In the 11/782, you have two 11/780s with shared memory. But one of the
systems acted as a slave to the other. All I/O was done through only one
of the systems. The other was just a CPU resource.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
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