Chase, John wrote:
-----Original Message-----
From: IBM Mainframe Discussion List On Behalf Of Edward Jaffe
Chase, John wrote:
More likely the IFL has one or more instructions disabled, without
which z/OS simply won't IPL.
Rick is implying that the disabled instruction on specialty
engines is not documented in POO.
My GUESS is that it's a DIAG......
That's probably the case. DIAGNOSE seems to be the prevalent mechanism
for software to talk to microcode. Can't help but wonder: what does MVS
use to update the I/O config in the "deep code". I've noticed, as I'm
sure everyone else has noticed, that the IODF batch processor program
changes names each time the CPU type changes. Variations in DIAGNOSE
parms? )Probably!) :-)
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