gtpg1m0pGeneral Information

Increased Main Storage for Application Use

Using the TPF 4.1 system, your application benefits from increased access to storage above and below 16-MB, while maintaining the 24-bit application program interface (API) for existing Transaction Processing Facility system software. The concept of virtual storage replaces the concept of real (main) storage.

The TPF system supports up to 2GB of main storage. With the use of the dynamic address translation (DAT) facility, TPF system programs can view and manipulate storage located above 16-MB as if the storage were below 16-MB, removing the 16-MB constraint and allowing program access of up to 2GB of main storage. Each message can use up to 2MB of memory for its private use and then reference any other data that is available in main storage.

The TPF system's use of storage is streamlined and more storage is available below 16-MB for application programs. Programs written using 31-bit addressing can use a separate, exclusive 31-bit program area above 16-MB. All large TPF system tables are supported above 16-MB.