SHARE Presentation: Migrating to z/OS V1R4, Parts 1 and 2 - page 78, at http://docs.share.org/proceedings/sh100/s2871.pdf.

z/OS V1R4 Migration: Section 5.3.1 - Accomodate automatic tape switching changes, at http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/e0z2m101/5.3.1.