March 2007
Beginner
526 pages
13h 53m
English
book
Introduction to the New Mainframe: z/VSE Basics
by Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, G. M. (Jerry) Johnston, Wilhelm Mild, Ingolf Salm, Joerg Schmidbauer, Martin Walbruehl, Mike Ebbers
Content preview from Introduction to the New Mainframe: z/VSE Basics
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Chapter 1. Introduction to the new mainframe 15
new hardware and system software revolves around this compatibility
requirement.
The overriding need for compatibility is also the primary reason why many
aspects of the system work as they do, for example, the syntax restrictions of the
job control language (JCL) that is used to control batch jobs. Any new design
enhancements made to JCL must preserve compatibility with older jobs so that
they can continue to run without modification. The desire and need for continuing
compatibility is one of the defining characteristics of mainframe computing.
Absolute compatibility across decades of changes ...
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