If the interpreter is being called after the converter, processing for both the converter and the interpreter is done in a separate address space to accommodate data isolation and storage space requirements. In z/OS 2.1, multiple data structures are altered to support running the subtasked portion of the conversion phase in a separate address space. The data area changes are consistent (from an exits perspective) across the JES2 address space and the new JES2CI address space.

The conversion PCE exits in both environments (JES2 and JES2CI private) and remains essentially unchanged. A conversion DTE in both environments represents the subtask. However, most of the data areas that were in the DTE prior to z/OS 2.1 have been moved to two new local work areas, the CIWORK and CIWORKB data areas, which are both contained in the $CIWORK macro. These areas are 31 and 24-bit JES2 or JES2CI private storage work areas for the conversion subtasks.

Prior to z/OS 2.1, the DTE also passed information about the job being converted from the PCE that selected the job to the DTE that was converting the job. In z/OS 2.1, this is no longer possible because the DTE could exist in a separate address space. The CIPARM data area in the $CIPARM macro is now used to communicate this information. The CIPARM data area is located in the PSO data space and is pointed to by both the PCE (pointer JPCECIP and ALET $PSOTOK) and the DTE (pointer DCNVCIP and ALET DCNVCIPL).