OK, now that you mention DSCBs, let me ask the VTOC gurus a question about
FMT1/8 DS1LSTAR -
I want to confirm my reading of how the number of "used tracks" for a
dataset is calculated in the context of large and extended formats.
Here's some pseudo-code for how I think it is calculated:
used_tracks = DS1LSTAR.TT (the first two bytes of the TTR)
if (DS1STRP) {
used_tracks = (DS1TRBAL << 16) + used_tracks; // two new high-order
bytes
} else if (DS1LARGE) {
used_tracks = (DS1TTTHI << 16) + used_tracks; // one new high-order byte
}
This seems odd to me - am I understanding this correctly?
My other question has to do with PDS-Es. I've read that LSTAR can't be
used, but I notice that ISPF 3.4 has used% for PDS-Es.
Kirk Wolf
Dovetailed Technologies
http://dovetail.com
On Fri, Oct 28, 2011 at 10:42 AM, Chase, John <jch...@ussco.com> wrote:
> Thanks, Bill, John and Tony.
>
> Abject frustration here, as I was just reading this stuff last week, and
> today just "drew a blank" on where I was reading it.
>
> And "they" keep telling me that getting old(er) is better than the
> alternative.... ;-)
>
> -jc-
>
> > -----Original Message-----
> > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On
> Behalf Of Bill Fairchild
> > Sent: Friday, October 28, 2011 10:35 AM
> > To: IBM-MAIN@bama.ua.edu
> > Subject: Re: DSCB DSECTs?
> >
> > The answer to this question was given a couple of weeks ago by Bob
> Shannon and it is in the IBM-MAIN
> > archives, always a good place to search along with the Internet for
> technical info.
> > Try doing an ISPF 3.14 against SYS1.MACLIB(*) and/or SYS1.MODGEN(*)
> for the character string "DSCB".
> > Yes, there will be lots of hits, but the correct macro will also be
> found, and it will have a lot more
> > lines of text in it than any of the others displayed.
> > Or look in SYS1.MODGEN(IECSDSL1).
> >
> > Bill Fairchild
> >
> > -----Original Message-----
> > From: IBM Mainframe Discussion List [mailto:IBM-MAIN@bama.ua.edu] On
> Behalf Of Chase, John
> > Sent: Friday, October 28, 2011 10:14 AM
> > To: IBM-MAIN@bama.ua.edu
> > Subject: DSCB DSECTs?
> >
> > OK, now I know I've gone blind: I can't seem to find a DSECT for the
> various formats of DSCBs. It
> > also seems the Data Areas manuals aren't published any more (I don't
> find them in the z/OS 1.11 MVS or
> > DFSMS bookshelves). I've run SuperC searches on MACLIB and MODGEN,
> but nothing there "jumps out".
> >
> >
> >
> > Would one of you be so kind as to shove my nose into the right book or
> macro?
> >
> >
> >
> > TIA,
> >
> >
> >
> > -jc-
> >
> >
> >
> >
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