Jim Mulder wrote:

If this is just a matter of curiosity, surely you old time hackers can do more than speculate. For example, look in the MVS Diagnosis Reference to find the module name called by the IDENTIFY SVC. Find some microfiche older than SP4.3.0., and
read the module prolog.

 As always, I must caution you as to the risks of actually using
undocumented interfaces.

So, when IBM "removed" the function from MVS, they created a "secret handshake" (available to privileged code only) to allow the loader itself to continue using the interface? Cute!

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