Run time and configuration

•	iscobol.file.index.check_all_keys (boolean) should be set to true in the configuration in order to activate the check on keys structure.

•	iscobol.gui.screen_col_zero (boolean) should be set to true in the configuration for compatibility on the DISPLAY at COLUMN 0.

•	By default, isCOBOL uses 2002 ANSI standard file status codes. These codes differ from those usually used by RM/COBOL. If RM/COBOL programs were written to the 1974 RM/COBOL standard, you should add the following line to the configuration:

iscobol.file.status=com.iscobol.io.FileStatus74

If RM/COBOL programs were written in RM/COBOL-85, instead, set:

iscobol.file.status=com.iscobol.io.FileStatus85

•	RM/COBOL (but not RM/COBOL-85) automatically closes all non-print files in a subprogram when that program exits. This is not default behavior with isCOBOL, but you can obtain it by adding the following entry to the configuration:

iscobol.file.close_on_exit=1

or by compiling programs with the following compiler option:

-coe

•

Under RM/COBOL, if the main program has a Linkage Section, it is initialized by the parameter passed on the command line. Under isCOBOL, it is illegal to reference Linkage Section items in the main program. You can get rid of this difference by using a stub main program that takes care of intercepting the command-line and pass it to the original main program through a CALL statement. E.g.

program-id. runcobol.  working-storage section.  01 prg-name          pic x(32).  01 parameters        pic x(2047).  01  main-linkage.      03  cmd-length   pic 9(4) binary value 0.      03  cmd-line     pic x(2047).  procedure division chaining prg-name, parameters.  move parameters to cmd-line.  inspect cmd-line tallying cmd-length for          characters before initial trailing space  call prg-name using main-linkage.  goback.

Then, instead of running:

iscrun MAIN 001

Run:

iscrun RUNCOBOL MAIN 001