>GETMAIN did ca. 1991.

I do not know what you were looking at, but it is almost certainly not
GETMAIN.

The VSM front-end module has not checked for super bits (or disabling locks
held), back to MVS/XA (long before 1991). Only branch-entry global getmain
would have checked in any case (it used not to check at all, but assumed
you got it right) and it has always checked the PSW mask

And if you turned on the IO Super bit, you were compromising the system.
These bits do not simply mean that "it is MVS-recognized disablement".

I'm actually not sure what the rules were prior to MVS/XA, when the CPU
lock was introduced.

Peter Relson
z/OS Core Technology Design
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