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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90 Introduction to the New Mainframe: z/VSE Basics
In z/VSE, a program’s attributes include one called residence mode or RMODE,
which specifies whether the program must reside (be loaded) in storage below
16 megabytes. A program with RMODE(24) must reside below 16 megabytes,
while a program with RMODE(31) can reside anywhere in virtual storage.
Examples of programs that require below-the-16-MB-line storage include any
program that uses application programming interfaces (APIs) that require 24-bit
addressing, like some I/O APIs. Those programs, however, can be 31-bit
addressing mode or AMODE(31), but they have to run below the 16 MB line.
Many programs in use today are AMODE(24) and therefore RMODE(24). Every
program written before VSE/ESA was ...
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