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.
Tony Thigpen
Peter Relson wrote on 9/2/20 8:11 AM:
<snip>
What CPU's were involved with each level, and what was the real
underlying item changed on the CPU that forced a new level?
</snip>
No one seems to have answered Tony's question.
For z/OS V2R1 and onward, the information can be found in
z/OS Planning for Installation -> Preparing the target system ->
Identifying hardware requirements for the target system -> Identifying
server requirements
https://www.ibm.com/support/knowledgecenter/SSLTBW_2.4.0/com.ibm.zos.v2r4.e0zb100/osproc.htm
which has
Table 1. Minimum server levels and machine facilities that are required
for z/OS
Then, older than that
-- z/OS 1.6 introduced the requirement for z/Architecture.
-- MVS/ESA 3.1.0 introduced the requirement for ESA Architecture.
-- MVS/XA 2.1.0 introduced the requirement for XA Architecture.
Maybe there were some others in the middle of these older ones but nothing
comes to mind.
In general, ALS's are to a set of functions, not to a particular machine.
A particular machine will satisfy those functions, but the ALS does not
mean that it is OK to assume you can use all the functions of that
machine.
Peter Relson
z/OS Core Technology Design
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