Unload is a very simple generic program needing only maximum record length and file names.
Load is a very simple generic program needing only maximum record length, file names, and key offset and length. Sample code is provided in Appendix A.
Load requires use of extfh.cfg to prevent null bytes from being stripped from output.
The source programs in Appendix A are small and very simple. If you find that you have a large number of files that need to be converted, then one approach would be to use a shell script to generate the unload and load programs.
The easiest way to automate the process and generate the conversion programs via scripts would be to place all of the %REPLACE statements and the VSAM File Declarations in a PLI %INCLUDE. You should then be able to compile up the programs and be off and running.
In our testing of this process we had both the Open PL/I 7.4 Compiler and Open PL/I 8.1 Compiler and RTS Environments running side by side with no problems.