Upgrading programs

Upgrading OS/VS COBOL source programs
There are differences between OS/VS COBOL language and Enterprise COBOL language that might require that you upgrade your programs.
Compiling converted OS/VS COBOL programs
Upgrading VS COBOL II source programs
There are differences between the VS COBOL II language and the Enterprise COBOL language that might require that you modify your programs.
Compiling VS COBOL II programs
Upgrading IBM COBOL source programs
There are differences in COBOL language support between IBM® COBOL and Enterprise COBOL.
Compiling IBM COBOL programs
Upgrading programs from Enterprise COBOL Version 3
To compile with Enterprise COBOL Version 5 or Version 6, Enterprise COBOL Version 3 programs that use any of several features might need to be changed.
Compiling Enterprise COBOL Version 3 programs
There have been a number of changes to compiler options and debug behavior since Enterprise COBOL Version 3.
Compiling Enterprise COBOL Version 4 programs
There have been a number of changes to compiler options and debug behavior for Enterprise COBOL Version 4 programs.

Parent topic: Migration guide