>....
>My rather poor memory says it was DOS only. I don't recall it being
>available at MFTII rel 18.6 (?).
>Somebody pipe up if I am wrong, please.
>...
I think it must not be just DOS because a B37-08 abend has as one
of its explanations:
o A split cylinder data set was located on cylinder zero, the
same cylinder as the VTOC, or the same cylinder as a
non-split cylinder data set.
In fact, I found 20 hits in an old Messages manual.
That, of course, gives no clue about when the support was first
added.
Back in my (pre /VSE) DOS days (mid '70s) I remember spilt
cylinder allocations for IS files. It could be that the (pre-) MVS
support was added to handle the DOS files.
Pat O'Keefe
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