On Fri, Jul 20, 2007 at 10:00:22AM -0400, Mark Wonsil wrote:
> > //JOB
> > //VOL (volume (diskdrive) name here)
> > //LBL (name of file)
> > //LFD (program name of file)
> > //EXE
> > //EOJ

Actually, this applies only to DOS/VS and its successors. The JCL for MVS is
quite different.

> In my time at an IBM shop, I remember that one had to keep track of your files
> manually, that is, there was no directory structure. You had to indicate the
> starting cylinder and tracks for each file. This was especially true scratch
> areas for sorting. I can't tell you how many times someone (not me) would
> overwrite a file because their sort routine used a scratch area on disc that
> overlapped a production file. Yikes.

This, too, is only true of DOS/VS and its successors. MVS does have a
directory on each disk (called a VTOC, for volume table of contents), and
will prevent you from allocating two datasets in the same place.
-- 
Jay Maynard, K5ZC                   http://www.conmicro.com
http://jmaynard.livejournal.com      http://www.tronguy.net
http://www.hercules-390.org               (Yes, that's me!)
Buy Hercules stuff at http://www.cafepress.com/hercules-390

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