At 12:29 -0500 on 12/20/2007, (IBM Mainframe Discussion List) wrote about Re: Max. number of physical blocks on 3390 track:

I forgot to add that I found the official formula once, probably on an IBM
reference card for the 3390.

I seem to remember macro TRACKCAP (?) that would return the needed information to you (or I may be confused and it had a different function).

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