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IBM z/OS operating system
Mainframe operating system: z/OS - IBM
z/OS Introduction - IBM Redbooks
IBM z/OS basic skills education
Introduction to the New Mainframe: z/OS Basics - IBM Redbooks
IBM z/OS - IBM Developer
Announcing IBM z/OS V2.5, Next-Gen Operating System Designed …
z/OS operating - IBM
IBM z/OS - Tutorials - IBM Developer