Designing and Programming CICS Applications by John Horswill & Members of the CICS Development Team at IBM Hursley

Author:John Horswill & Members of the CICS Development Team at IBM Hursley [John Horswill]
Language: eng
Format: epub
Tags: COMPUTERS / Hardware / Mainframes & Minicomputers
ISBN: 9781449313036
Publisher: O'Reilly Media
Published: 2011-07-12T16:00:00+00:00

What Is BMS and What Does It Do?

BMS simplifies your programming job, keeping your code largely independent of any changes in your network of terminals and of any changes in the terminal types. It’s probably easiest to define what BMS does by examining the menu screen that is part of our initial program; see Figure 11-1. It all looks quite straightforward, even if there is a lot of detail.

Figure 11-1. The menu screen

You define this screen with BMS macros, which are a form of System/390 Assembler language. When you’ve defined the whole map, put some job control language (JCL) around it and assemble it. You assemble it twice, in fact. One of the assemblies produces the physical map. This gets stored in one of the execution-time libraries, just like a program, and CICS uses it when it executes a program using this particular screen. However, this physical map does not contain any executable code—the physical map is stored in a program library to enable it to be loaded and unloaded like code.

The physical map contains the information BMS needs to:

Build the screen, with all the titles and labels in their proper places and all the proper attributes for the various fields.

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