In both versions of DOS you are testing, what is the value returned by the List
of Lists function (LOL -- INT 21.52) at offset 21h ("number of available drive
letters")? It should match what is being returned by INT 21.0E (in fact, INT
21.0E should simply return the value stored in the LOL -- it shouldn't need to
do any calculations or manipulations). The value stored in the LOL is also the
number of entries in the Current Directory Structure (CDS) table, and you may
be able to do some indirect verification that way as well.
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