Do I understand correctly? All z/PDT's return z1090 or z1091 for D M=CPU?

How can one determine the effective architecture level? Is it pretending to
be a z9 or a BC12?

(On a customer machine. I know that possible general answers are "write a
program to query the facility bits" or "use a CBT tool" but I would like an
answer that relied only on things that a customer would already have in
place, such as a console command.)

Charles Mills

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