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 program object produced from the same source code
when compiled with Enterprise COBOL V5 or V6 will be larger
than the load module produced when compiled with all earlier versions
of COBOL. The reason for this is the increased use of compile-time
calculations saved in constants in the program object, which improves
runtime performance.