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Jim Elliott Consulting Sales Specialist – System z IBM Canada Ltd.

IBM Mainframes – 45 Years of Evolution

© 2009 IBM Corporation

IBM

Reports of the death of the mainframe were premature
“I predict that the last mainframe will be unplugged on March 15, 1996.” – Stewart Alsop, March 1991 “It’s clear that corporate customers still like to have centrally controlled, very predictable,reliable computing systems – exactly the kind of systems that IBM specializes in.” – Stewart Alsop, February 2002

Source: IBM Annual Report 2001 2
© 2009 IBM Corporation

In the Beginning The First Two Generations

© 2009 IBM Corporation

IBM

Well, maybe a little before…

IBM started out as a merger of three US companies, which became units of CTR – Computing Scale – TabulatingMachine – Time Recording The Canadian unit became the International Business Machines Co. Ltd. in 1917 The parent became International Business Machines Corporation in 1924

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© 2009 IBM Corporation

IBM

The family tree – 1952 to 1964

Several mainframe families announced, designed for different applications Every family had a different, incompatible architecture Within families, movingfrom one generation to the next was a migration – Common compilers made migration easier – COBOL and FORTRAN

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© 2009 IBM Corporation

IBM

IBM 701 – 1952 1st generation
The first IBM large-scale electronic computer manufactured in quantity IBM's first commercially available scientific computer The first IBM machine in which programs were stored in an internal, addressable, electronicmemory The first of the pioneering line of IBM 700 series computers, including the 702 through 709

701
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© 2009 IBM Corporation

IBM

IBM 305 RAMAC – 1956 1st generation
The first computer to include a disk drive (named the IBM 350 Disk File) Prior to this magnetic computer storage had consisted of core memory, tape, and drums The 350 Disk File consisted of a stack of fifty 24 inch discsThe capacity of the entire disk file was 5 million 7-bit characters, which works out to about 4.4 MB in modern parlance

350 Disk

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© 2009 IBM Corporation

IBM

IBM 1401 – 1959 2nd generation
The all-transistorized IBM 1401 Data Processing System placed the features found in electronic data processing systems at the disposal 729 1402 1401 1403 of smaller businesses, previouslylimited to the use of conventional punched card equipment These features included: high speed card punching and reading, magnetic tape input and output, high speed printing, stored program, and arithmetic and logical ability

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© 2009 IBM Corporation

IBM

IBM 1440 – 1962 2nd generation
Low-cost system specifically designed to solve the increasing data handling problems of smaller volumebusinesses The 1440 met the need for a 1443 1441 1311 complete accounting system and offered the benefits of a business information system With a variety of models and special features available for the 1440, a system could be tailored to meet immediate data processing requirements and expanded to absorb increased demands

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© 2009 IBM Corporation

IBM

IBM 7094 – 1962 2nd generation
Builtfor large-scale scientific computing Compatible with the IBM 7090, the advanced solid-state IBM 7094 offered substantial increases in internal operating speeds and functional capacities 7094 New expanded functions provided with the IBM 7094 were double-precision floating-point operations and seven index registers

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© 2009 IBM Corporation

The April 1964 Revolution 3rd generation

©2009 IBM Corporation

IBM

During the 1950s, Data Processing came of age

Data Processing machines existed – sorters, collators, tabulators “Computers” were devoted almost entirely to the processing of computationally intensive tasks Demand for computers, as data processing machines, boomed and new machines were built to meet this demand Customers were getting very frustrated with migration...
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