Unix versions

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Fri Apr 26 12:57:32 2002

On Apr 26, 10:19, Bill Pechter wrote:

> > I'm slightly puzzled by what you say about DEC X-11, though. My
> > to it and XXDP is only in the form of the diagnostics available to end
> > users and third-party service organisations, and I suspect there's more
> > it than that. The reason I think of XXDP as the OS and X-11 as the,
> > application in a way, is that all I see are the X-11 modules to run
> > and series of tests, whereas XXDP includes the monitor, system handlers
> > (as well as the diagnostic programs and utilites, of course). To me,
> > that's the OS.
> >
> > --
> > Pete Peter Turnbull
> > Network Manager
> > University of York
> You're exactly correct, except the XXDP doesn't have drivers for
> the comm gear and other stuff, whereas DECX/11 can have modules
> running simulating disk and tape i/o, comm i/o and can do task
> scheduling and timeouts. Also DECX/11 is interrupt driven where most of
> XXDP polls status registers.

Yes, I knew about the polled operation.

> I stretched my view a bit. DEC training called XXDP a diagnostic
> monitor... which was ok until the DS> diagnostic supervisor got loose...
> and the names collided.
> The XXDP monitor is single tasking, non-interrupt driven, polling and
> can hang forever waiting for an event that never comes. DECX/11 won't.
> DECX/11 seemed much more os-like. Batch streams do exist in XXDP
> (the .ccc chain files) -- but that's just minimal scripting.

Yes, .ccc is of rather limited use. Enough for sets of diagnostics and not
much more, really.

Thanks for the information -- I'm enlightened. Did DECX/11 ever make it
outside of DEC's walls, other than in the form of strings of modules for
field confidence tests?

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Fri Apr 26 2002 - 12:57:32 BST

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