Hm, IIRC the 83x0 was as asymetric as the 782...? It could also only
take the interrupts at the master CPU.
...then there was the multiprocessor MV2, that had both local and shared
memory...
-- Ragge
Den 2016-09-07 kl. 21:15, skrev Hittner, David T (IS):
Wasn't the VAX 11/782 and the Asymmetric model de-supported at some point
during the life of VMS?
I seem to remember hearing (at a DECUS Symposium?) that existing 11/782
customers would have to separate them into two 11/780's and then cluster them
to upgrade to the latest version of VMS.
Dave
-----Original Message-----
From: Simh [mailto:[email protected]] On Behalf Of Johnny Billquist
Sent: Wednesday, September 07, 2016 2:55 PM
To: Ray Jewhurst
Cc: [email protected]
Subject: EXT :Re: [Simh] Pdp8 terminals
Hi.
On 2016-09-07 19:00, Ray Jewhurst wrote:
My apologies. To be honest I am very ignorant about of the science of
computers. I am disabled, cannot work but I am a total computer
history buff. I want to learn and know and experience as much as I can
and Simh is a major part of that. I want to help where I can so
please excuse my occasionally confusion.
No worries. You never learn if you are afraid of making mistakes.
However, if you are not rather experienced writing code, I think that
implementing something like the VAX-11/782 might be quite a task... Not to
mention that I don't know where you'd find a version of VMS that would support
the machine.
Maybe find something a little simpler to start with? Like the talk about
expanding the PDP-8 to more generic support for devices than the current
implementation.
Johnny
On Sep 7, 2016 12:46 PM, "Johnny Billquist" <[email protected]
<mailto:[email protected]>> wrote:
The 11/782 are no more asynchronous than any multiprocessor system.
The A in ASMP stands for assymetric. As in, the second processor did
not run any kernel code, but is a slave processor to the primary
processor. It gets scheduled with user-land code to run, but any
trapping to the OS means it interrupts the main processor, who do
all the work.
Johnny
On 2016-09-07 18:23, Ray Jewhurst wrote:
I think you are like I am. I would like to see every DEC simulator
possible. Right now I am doing some preliminary research into the
feasibility of a VAX 11/782 which is an asynchronous dual processor
11/780. I will need help because I am not a real experienced coder.
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