On Thu, 22 May 2008 14:46:23 -0500, William H. Blair wrote:

>> Speaking of "80-column", when did JES2 overcome the
>> fixed 80 restriction on SYSIN data sets?
>
>The short version: (1) Long ago for LRECL up to 254.
>(2) z/OS 1.7 for LRECL up to 32K.  The long version:
>
>We had an application that read LRECL=204 or 208 or
>something like that in JES2 4.1.  Note: That is JES2
>4.1, which was before JES2/NJE and before JES2/SP for
>MVS/SP 1.3.0.
>
>So, that would have been on MVS 3.8 (with various SUs
>installed, but of course they have nothing to do with
>this issue). The timeframe for this was 1977-1978, but
>this application was in production at least one year
>before then, ...

Was this with RECFM=F or RECFM=V?  (I consider RECFM=F
an adjunct to the "80-column minds".}

Circa 1995 (well after 1978) I encountered a serious
problem with RECFM=V which was repaired briefly by
OW10527, a massive change to make by PTF rather than on
a release boundary, then regressed a few months later
by OW16674 (apparently some customers preferred it
broken).  Very recently, I noticed that JES2 is back to
the OW10527 behavior.  OA08145, the "long SYSIN" APAR
may have incidentally repaired the damage reintroduced
by OW16674.  I hope customers afflicted with "80-column
minds" don't prevail on IBM to break it again.

To this end, is there anywhere documentation on how the
attributes of the SYSIN data set as perceived by the
problem program reading it are determined by the JCL
attributes of the internal reader and the characteristics
of the instream data?  OW10527 provides a table, but there's
good reason to believe that's obsolete, and I know of
no instance in a reference manual?  (Wasn't there some
complaint here recently about needing to search APARs
to discover documentation?)

-- gil

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