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Mainframe Computers

"Mainframe" refers to computers compatible with the computer architectures established in the 1960s.

Surya Mishra

on 28 September 2012

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Transcript of Mainframe Computers

The Mainframe Computers Mainframe computers (referred as " big iron '' ) are powerful computers , which are used to distinguish the traditional , large , institutional computer intended to service multiple users from the smaller , single user machines. It is primarily used by corporate and governmental organizations for critical applications , bulk data processing such as census , industry and consumer statistics , enterprise resource planning , and transaction processing. The term also refers to the large cabinets that housed the central processing unit and main memory of early computers. Mainframes are measured in millions of instructions per second (MIPS). History of Mainframe Computers IBM developed its first mainframe computer known as Automatic Sequence Controlled Calculator (ASCC) , in 1944. It solved multiplication and addition problems in less than six seconds. The Automatic Sequence Controlled Calculator was operated by a system of thousands of vacuum tubes. Several manufacturers produced mainframe computers from the late 1950s through the 1970s. The group of manufacturers were known as "IBM and the Seven Dwarfs" : IBM , Burroughs ,UNIVAC , NCR , Control Data , Honeywell , General electric and RCA.
Later it was referred as IBM and the BUNCH. IBM's dominance grew out of their 700/7000 series and, later, the development of the 360 series mainframes. The latter architecture has continued to evolve into their current zSeries mainframes which, along with the then Burroughs and Sperry (now Unisys)MCP-based and OS1100 mainframes, are among the few mainframe architectures still extant that can trace their roots to this early period. An IBM mainframe computer The Evolution of the Mainframe Computers The Automated Sequence Controlled Calculator There were 13 types of Mainframe Computers. They were divided into three generations of computers. They were :
1.ENIAC - It was invented in 1942.
2. Mark 1 - It was invented in 1944.
3.BINAC - It was invented in 1949.
4. IBM 701 - It was invented in 1952.
5. UNIVAC - It was invented in 1956.
6. IBM 305 RAMAC - It was invented in 1956.
7.Whirlwind - It was invented in 1960.
8. IBM 360 - It was invented in 1963
9.IBM 370 - It was invented in 1972.
10. IBM 390 - It was invented in 1990.
11. Z-series - It was Invented in 2000.
12. z 9 - It is invented in 2006.
13. z 10 - It is invented in 2008. ENIAC MAINFRAME COMPUTERS
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