What is excp?

EXCP, which stands for "Execute Channel Program," is a feature of IBM mainframe computers. It is a part of the Input/Output system, designed for communication between the system’s central processing unit and peripheral devices.

EXCP provides a standardized, high-speed interface for input/output operations. It optimizes communication between mainframe components and peripheral devices. The channel program is responsible for managing data transfer and handling error conditions.

EXCP was first introduced in the IBM System/360 mainframe in 1964 and has evolved over the years with newer mainframe models. It is widely used for managing large-scale batch processing, where data transfer between the mainframe and peripherals is critical.

EXCP has become an essential part of the mainframe operating system, providing a reliable and efficient interface for complex input/output operations. It is used in various industries, including finance, healthcare, and government, where secure, high-volume data processing is essential.