Mainframes

Cobol Coding Sheet In olden days, COBOL programs needs to be punched on the card and it will be loaded to punch card reader. For to identify the program coding by the punch card reader,there was a need of coding sheet. The Cobol coding sheet was a structure to identify from where the cobol coding statements punched or started writing to differentiate the...

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Introduction to Cobol Cobol is an acronym for Common Business Oriented Language where it is primarily developed for Business, Finance and Administrative System Needs. It is a high-level programming language very first developed by CODASYL committee (Conference on data systems languages) in the early of the 1960s (the first compiler is implemented in the same year). After that, it was assigned to the...

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Advantages of Mainframe Computers ✦ Availbility ➤ The recent mainframe systems Z series are designed to provide availability of 99.999%. ✦ Scalability ➤ The ability of a system to expand as resources, such as processors, memory, or storage are deleted. ✦ Reliability ➤ It is a measurement of the ability of a system to continue processing without failure. ➤ The "Z" in the...

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Characteristics Features of Mainframe Operating System ♨ Virtual Storage: In most computer systems, the processor's main storage is among the most valuable of the systems resources. As a result, modern mainframe computer operating systems provide sophisticated services to make the best use of the available main storage. Among the most important of these services is virtual storage. Virtual storage is a technique that...

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Evolution Of Z / OS (zero downtime operating system) Primary Control Program(PCP): ➽ It was the first release of OS version by IBM in the year 1965. It had limited capabilities and it doesn't offer multi programming, no priority scheduling and no spooling facility. It was an unreliable system and became obsolete in the year 1969. ➽ Multiprogramming concept was introduced with the...

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Introduction to Mainframes Mainframe is a high performance multi user computer system which is the most scalable, available, reliable and secure machine in the world capable of handling numerous terminals and peripherals simultaneously. Terminal definition- A device, usually equipped with a keyboard and display device(Without a CPU), capable of sending and receiving information over a network. IBM 3270 terminals are used to connect...

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