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An IBM mainframe occurs as big, high-vet computer processed by International Business Machines (IBM). Mainframe computers traditionally are expensive, physically big, & use at times high transaction processing and I/O performance, but are non when expensive & high-performance when supercomputers.

Description

From either 1950 to 1965, IBM and many more corporations made many computer system, virtually all of which were incompatible by having every more. IBM got ii exemplary categories: 1 for even commercial message or information processing apply, & 1 for engineering & scientific utilize. Them categories were largely incompatible by owning every more, & there were incompatibilities possibly in every category. Completely that changed sustaining a announcement of the System/360 (S/360) in April, 1964. A System/360 was one series of compatible system for each commercial message & scientific have. A System/360 afterwards evolved into a System/370, the System/390, the zSeries, and a System z9.

System/360 (suggesting a "360 degree", or "all-around" adp system) incorporated features which got antecedently been present in exclusively either a commercial message line (like decimal arithmetic & byte addressing) or even a technical indicator line (like floating point arithmetic).

Notable pre-System/360 IBM mainframes involved: IBM   650 (business/data processing) IBM   704 (science/engineering) IBM 1401 (business/data processing) IBM 7090 (science/engineering)

Software

Operating systems
A primary operating systems inside have in IBM mainframes include z/OS (which followed MVS and OS/390), z/VM (previously VM/CMS), z/VSE, z/TPF, and Linux on zSeries. Two or three systems however start MUSIC/SP, another operating models. Former operating systems for the System/360 family and its successors involved OS/360 (with PCP, MFT, & MVT), BOS, TOS, DOS, and SVS. There are programs-depending ape for the System/370, System/390, zSeries, and System z9 hardware, including FLEX-ES and the freely available Hercules emulator which runs under Linux & Microsoft Windows. A original OS/360 and early MVS and VM/CMS versions have been freed free of charge apply.

Middleware
IBM mainframes do all the major enterprise transaction processing environments and databases, including CICS, IMS, WebSphere Application Server, DB2, and Oracle. Within several lawsuits these software subsystems can redo in additional than a single mainframe operating technique.

Notes

  • A bit of of the arithmetical units & addressing features were optional in a few system of the System/360. Notwithstanding, system were upward compatible & virtually all were likewise downwards compatible.
  • Devices memory protection was provided to protect a operating formulas from either either a user software download (tasks) & a user tasks from every more.
  • Nowadays dated. For details on the important 64-bit architectural changes, refer to IBM technical indicator publications (understand z/Architecture).

    • Bus-Tech
    Manufactures and markets mainframe connectivity and data movement products, both under their own brand name and as an OEM.

    64-bit Architecture
    Article by Patrick Mullenon on IBM announcing 64 bit architecture.

    Planet MVS
    Covers mainframe hardware and z/OS-related systems software topics. Including a collection of IBM Green Cards.

    Gilbert Saint-flour
    Links to P/390 information and z/OS freeware, as well as Gilbert's own z/OS tools and documentation.

    Eric Loriaux
    Large collection of categorized links covering IBM mainframe hardware and software topics, with special emphasis on the needs of systems programmers.

    Dinos Web Ring
    Access to over 30 Web sites run by individuals interested in mainframes.

    zSeries e-business
    IBM home page for interfacing the mainframe to the Internet. Includes links to news, technical information, products, services, performance, security and support.

    The IBM 360/67 and CP/CMS
    Tom Van Vleck's history of the IBM System/360 Model 67 computer and the CP/CMS operating system, which later became z/VM.

    Architecture of the IBM System/360
    1964 article coinciding with the announcement of the System/360 (S/360), the first family of computers to have the same machine architecture as IBM mainframes of today. Written by the S/360's architects: Gene Amdahl, Gerrit Blaauw and Fred Brooks.

    Computer History: IBM 360/370/3090/390
    A personal history of the IBM mainframe by Lars Poulsen.
    Computers: Hardware: Used






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