Jim,
since, as you say, this issue goes back an awfully long way, it seems
very odd that IBM never implemented any facility to achieve the same
result as in your solution in the OS code - i.e. an additional
subparameter to the VARY command to set the bit you mention, or even a new
command to achieve the same result.
It seems like a number of people have been impacted by this issue over a
long period of time - to the point (in your case) of writing code to
circumvent the problem.
Perhaps there is a good reason why they never have - does anybody know
what that is?
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