z/TPF

The z/TPF architecture is optimized for high-volume transaction processing, featuring several key components. The Core System manages the fundamental operations of the operating system, including scheduling, memory management, and system services. The Input/Output (I/O) subsystem handles all I/O operations, ensuring efficient data transfer between the system and external devices.

The Database Manager provides data storage and retrieval capabilities, optimized for the rapid access required by transaction processing applications. Communication between these components is primarily through internal system calls and shared memory. Data storage utilizes a combination of main memory and direct-access storage devices (DASD).

The system does not expose standard REST or SOAP APIs; instead, developers interact with the system through assembler routines and system calls. Security is implemented through user profiles and security keys, with support for encryption of data at rest and in transit. The command-line interface (CLI) is the primary administrative interface, with commands like `ZSYSO` for system operations, `ZFILE` for file management, and `ZLOAD` for loading programs.

z/TPF's design prioritizes speed and efficiency, making it ideal for real-time transaction processing.