Installing the Online Interfaces › How to Configure the Online Interfaces Without CA CSM › Install the Cross-Memory Services

Install the Cross-Memory Services

The cross-memory services interface is required for the following online interfaces:

• CICS pseudo-conversational
• IMS
• VTAM
• ISPF/cross-memory
• TSO/cross-memory
• CA Roscoe/cross-memory

This list summarizes the steps to install the cross-memory services. Detailed instructions are in the sections that follow.

1. (Optional) Add the start procedure to PROCLIB for the cross-memory online task.
2. (Optional) Modify, assemble, and link edit the EC1XMCTR module.
3. Define security requirements.

Cross-Memory Services Regions

The VTAM and XMS (cross-memory services) interfaces operate in one or more cross-memory online regions.

A cross-memory region can be configured as:

• An XMS only region
• A VTAM only region
• A combination of XMS and VTAM users

Be aware of the following:

• Each cross-memory region is configured with the start-up parameters provided on the PARM= of the execute statement, and with an optional SYSIN DD statement.

  The REGION= specification determines the maximum number of users supported.

• Allow 20 MB (megabytes) for the XMS region plus 1 MB of storage for every two users.

For example, if you specified a REGION of 120 MB, you could specify:

USERMAX=200

If more users are needed, multiple regions can be started under the same SUBSYS= value and will be chained together.

Note: The REGION ID specified in the parameters must be different for each region, and if VTAM interface is used, a different SARAPPL= name will be needed for each region.