On 11/27/2017 5:57 AM, Peter Relson wrote:
I don't know the official answer, but a way to guesstimate a quasi-sane
answer:
Pick whatever machine was made available 3 years after OS/390 2.5 became
available.
Any machine available after that would most likely not have had any
exploitation support provided as far back as a release 3 years old, but
might have had toleration support.
Add another 3 years and come up with that machine and you'll likely not
have had toleration support either as far back as OS/390 2.5.
My recollection is that the two-tier TLB was the major change that broke
stuff. Back in the day, z/VM used to do a good job hiding that
difference (and perhaps others) from the older operating systems that
couldn't cope...
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