W dniu 02.09.2020 o 15:08, Tony Thigpen pisze:
Peter, thanks.
But, my original question was not worded well. What I am really
looking for is:
What major feature change prevented older operating system versions
from running on the newer box.
For example: What changed on the z990 that forced the use of the z990
compatability feature?
I am not talking simple things like OSA configure or IOCP to support
new hardware, but real changes that just made the base operating
system fail.
I'm not IBMer, however I remember z990 introduction. Among many changes
and enhancements the most important was XMP or multiple channel set.
That introduced PCHID, CSS, etc. It is not matter of IODF only, it is
matter of system working with the resources.
And there was another revolution, but only for ICSF-related things:
crypto hardware. z990 was first machine without CCF. It was first
machine with CPACF for clear key functions and PCIXCC cards for secure
key functions.
Note: the oldest supported MVS-like system on z990 was last OS/390 -
that means OS/390 V2R10. Compatibility feature (FMID) was required to
make it possible.
HTH
--
Radoslaw Skorupka
Lodz, Poland
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