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The Operating System for s/390 mainframes. Works as a general control program, partitioning the hardware and offering low level service where other applications - but you would call them true operating systems in PC world - like MVS, CICS and TSO live in. Yes, Linux too on recent IBM hardware.
As most things related to the mainframe world, it's usually considered quite boring by most hackers. On the other side, such machinery - and OS/390 itself - offers excellent uptime, data protection and security, complete scalability, error correction, the best database performance and storage access in a way that's simply impossible for lower end hardware.

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