We had an operator named Sheldon, who had the habit of resting his elbow
on the POR? button on the console keyboard (3033 maybe). After this
happened a couple of times we installed a pill box cover over the button
and named it the "Sheldon Shield".
Mark Jacobs
J O Skip Robinson <mailto:[email protected]>
December 1, 2015 at 4:19 PM
Timeframe was 1980 plus or minus. I was a true novice sysprog and kept
an arm's length from OS innards. It was during that two-year gig that
MVS/SP was announced, so not likely available just yet. I only
remember being impressed with the clever workaround that kept the
Amdahl useful.
P.S. The same machine had a load button on the system keyboard. One
day an operator's purse fell over and caused a midmorning IPL. Amdahl
installed a little box around the button. They were clever folks. ;-)
.
.
.
J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler
SHARE MVS Program Co-Manager
626-302-7535 Office
323-715-0595 Mobile
[email protected]
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]]
On Behalf Of Tom Marchant
Sent: Tuesday, December 01, 2015 7:27 AM
To: [email protected]
Subject: (External):Re: Straightforward way to determine hardware
architecture level?
That's SE Assist. And it led to the design on the 580 series of
computers that provided a third state of operation called (IIRC)
System state. The 580 design included hardware to virtualize the
user's processor.
The code that ran in System state was called Macrocode and it was
loaded from the console processor into memory that was outside of the
memory available to customers. Macrodode routines emulated new
instructions.
A side benefit of all that was that it made Multiple Domain Facility
possible.
The hardware that supported the virtualization included additional
registers for the use of Macrocode and other facilities that made MDF
quite efficient.
--
Tom Marchant
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Mark Jacobs
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