Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Compiler and Runtime Migration Guide


Assessing storage requirements

You can load most of the Enterprise COBOL compiler above the 16-MB line. In addition, Enterprise COBOL object programs execute in 31-bit addressing mode and can reside above the 16-MB line, which frees storage below the 16-MB line. You can use the freed storage for programs or data that must reside below the 16-MB line.

During conversion, you will need DASD storage for your current COBOL compilers as well as for the Enterprise COBOL compiler. When you have completed conversion, and if you have upgraded all of your OS/VS COBOL, VS COBOL II, or IBM COBOL programs to Enterprise COBOL, you will be able to free the storage reserved for your current COBOL compiler.

The load module produced from the same source code when compiled with Enterprise COBOL will probably be larger than when compiled with OS/VS COBOL or VS COBOL II.


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