IBM OS/390: An Overview of the Mainframe Operating System
After our most recent donation of more than 25 books and training materials about programming and working with the OS390 of IBM, we are pleased to supply you all with these key facts.
IBM OS/390 is an operating system developed by IBM for its System/390 mainframe computers. Introduced in the early 1990s, OS/390 integrated several core components of IBM’s mainframe environment into a single operating system package.Key Features of IBM OS/390 Integration: OS/390 combined existing components such as MVS (Multiple Virtual Storage), JES2/JES3 (Job Entry Subsystems), Communications Server, and Data Facility Storage Management Subsystem (DFSMS) into one cohesive system. Scalability: Designed to handle large workloads on IBM mainframes, OS/390 supported enterprise-level transaction processing. Networking: Included support for TCP/IP networking protocols. Security: Provided features to manage access control and data protection. Programming Support: Supported various programming languages used in mainframe environments, including COBOL, PL/I, and Assembler. Historical Context Before OS/390, IBM’s mainframe environment consisted of several separate systems that required individual management. OS/390’s introduction aimed to simplify system administration by consolidating these elements. OS/390 served as the foundation for IBM’s next-generation mainframe operating system, z/OS, which was released in the early 2000s. Typical Users IBM OS/390 was used primarily by large organizations in sectors such as: Banking and financial services Government agencies Insurance companies Large retail and manufacturing firms These organizations used OS/390 for transaction processing, database management, and running critical business applications. Legacy IBM OS/390 was gradually replaced by z/OS but influenced the design and features of subsequent mainframe operating systems. Mainframe systems based on OS/390 and its successors remain in use today in various industries.
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