If you're familiar with Unix, then you can apply this book in the inverse sense: MVS & UNIX: A survival Handbook for Multi-Platform Users, Developers, and Managers, Richard J. Bambara, McGraw Hill, 1998, ISBN 0070066639 [link|http://www.powells.com/cgi-bin/biblio?inkey=62-0070066639|Powells]. Covers issues from hardware architecture to editors & environments.

For general JCL: System 390 JCL, Fourth Edition, Gary DeWard Brown, Wiley, 1998, ISBN 0471283096 [link|http://www.powells.com/cgi-bin/biblio?inkey=65-0471283096-1|Powells]. An updated release may be available.