11/782 (was: Any own an 11/725...?)
pat at computer-refuge.org
Mon Oct 24 14:45:26 CDT 2005
On Monday 24 October 2005 12:00, a.carlini at ntlworld.com wrote:
> Huw Davies wrote:
> > Certainly the only 11/782 I know of (Melbourne University) was
> > split to get much better performance. Basically all I/O (and hence
> > all of VMS) had to occur in the "master" 11/780 so all that could
> > be run in the slave was CPU intensive jobs. As soon as your CPU
> > bound process wanted to do something other than compute it had to
> > be scheduled in the "master".
> The 782 certainly was two 780s joined at the hip. I thought that the
> SBI was joined up too but that might be the Purdue (?) VAX-11/784.
Purdue is correct, 11/784 isn't. The 11/784 is the quad-CPU version of
the 11/782. Purdue's dual-VAX didn't have a DEC model number, because
they never (officially) sold it.
Sharing the SBI made a much more usable dual-processor machine, where
both CPUs could access I/O and *all* of the available memory, not just
4MB of it.
Purdue University Research Computing --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
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