Configuration-z/Architecture-Architecture-Mode and ESA/390-Compatibility-Mode Facilities #336
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Note: this issue is closely related to issue #78: "z14 z/Architecture-only mode (CZAM)".
At one level this is really an ASMA question. But ASMA should do what Hercules does. So, here goes...
At one level it is simply about implementing a new PSW format. But it also puts a stake in the ground relative to ESA/390 support. The PoO suggests these two facilities might be installed separately. But, my understanding is that in practice they will both be present.
We have as near as I can tell merged ESA/390 and zArch in Hercules. ESA/390 is now on a Z box. There is no ability to actually have an ESA/390 machine not on a z box. Now we will need to separate them going forward. I truly believe the ESA/390 Compatibility Mode is also temporary. Not even sure how you get into that mode on a real machine.
I am trying to catch up with ASMA. I am looking at the 2017 PoO when these two facilities were introduced. That is part of why I am asking.
Has anyone thought about the implications?
Harold Grovesteen
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