z/OS 64-bit: Transition to 64-bit Server

The z/OS Server is now a 64-bit application, which offers significant capacity and scalability advantages to customers. However, conversion of isolated Server features and adapters to 64-bit is still in progress, and is expected to be completed in later builds of 7708/8203. Customers upgrading to 7708/8203 who need any of these features or adapters should contact Customer Support Services.

The following features are not yet fully functional in the 64-bit server.

• Calls to User Written Subroutines written in COBOL, Fortran, or PL1 (including calls via zcomp, CALLITOC, CALLDB2, CALLIMS, and MSODDX).

The following adapters are not yet fully functional in the 64-bit server.

• CICS Transactions.
• Db2 Change Data Capture (CDC).
• IMS Transactions, IMS XMI, and IMS BMP (DLI Interface).
• Millennium.
• Model 204.