Thanks Ed. This is getting a bit silly. The Diagnose instruction was
noted along with every other instruction in the POP, but no one but
FE's really knew what it could do, and I was an FE at the time,so I
knew just what it's capabilities were. Thanks for the defense
Ed, and I hope John is now satisfied.
Doug
At 23:35 27-12-07, you wrote:
On Dec 27, 2007, at 10:32 PM, John P. Baker wrote:
That may be, but that is not what he said. He referred
specifically to the
"existence" of the Diagnose instruction.
The Diagnose instruction has been documented in every Principles of
Operation manual issued for the S/360 architecture and for all
subsequent
superseding architectures, and in every case, has specifically
stated that
the functions performed by the Diagnose instruction are not
published, but
may impact any and all aspects of system operation, and if invoked
by a user
application built without access to that unpublished documentation,
may
negatively impact the proper functioning of the machine, requiring
a Power
On Reset and/or the assistance of a Hardware Support Engineer to
bring the
system back into proper working order.
John P. Baker
Yes I know what he *said* but we are not dealing in life and death
issues on here and (except for a few on here) this is not a pc
(politically correct) place. If I misunderstood what he meant to say
he is free to correct me.
Ed
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Doug Fuerst
Consultant
BK Associates
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