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SHARE Inc. is a volunteer-run user group for IBM mainframe computer
Mainframe computer

Mainframes are computers used mainly by large organizations for critical applications, typically bulk data processing such as census, industry and consumer statistics, Enterprise Resource Planning, and financial transaction processing....
s that was founded in 1955 by Los Angeles-area IBM 701
IBM 701

The IBM 701, known as the Defense Calculator while in development, was announced to the public on April 29, 1952, and was International Business Machines?s first commercial scientific computer....
 users. It evolved into a forum for exchanging technical information about programming languages, operating systems, database systems, and user experiences for enterprise users of small, medium, and large-scale IBM computers such as IBM S/360
System/360

The IBM System/360 is a mainframe computer system family announced by IBM on April 7, 1964. It was the first family of computers making a clear distinction between computer architecture and implementation, allowing IBM to release a suite of compatible designs at different price points....
, IBM S/370
System/370

The IBM System/370 was a model range of IBM mainframes announced on June 30, 1970 as the successors to the System/360 family. The series maintained backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the product announcement....
, zSeries
ZSeries

IBM System z, or earlier IBM eServer zSeries, is a brand name designated by IBM to all its mainframe computers.In 2000, IBM rebranded the existing System/390 to IBM eServer zSeries with the e depicted in IBM's red trademarked symbol....
, pSeries, and xSeries.

A major resource of SHARE from the beginning was the SHARE library.






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SHARE Inc. is a volunteer-run user group for IBM mainframe computer
Mainframe computer

Mainframes are computers used mainly by large organizations for critical applications, typically bulk data processing such as census, industry and consumer statistics, Enterprise Resource Planning, and financial transaction processing....
s that was founded in 1955 by Los Angeles-area IBM 701
IBM 701

The IBM 701, known as the Defense Calculator while in development, was announced to the public on April 29, 1952, and was International Business Machines?s first commercial scientific computer....
 users. It evolved into a forum for exchanging technical information about programming languages, operating systems, database systems, and user experiences for enterprise users of small, medium, and large-scale IBM computers such as IBM S/360
System/360

The IBM System/360 is a mainframe computer system family announced by IBM on April 7, 1964. It was the first family of computers making a clear distinction between computer architecture and implementation, allowing IBM to release a suite of compatible designs at different price points....
, IBM S/370
System/370

The IBM System/370 was a model range of IBM mainframes announced on June 30, 1970 as the successors to the System/360 family. The series maintained backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the product announcement....
, zSeries
ZSeries

IBM System z, or earlier IBM eServer zSeries, is a brand name designated by IBM to all its mainframe computers.In 2000, IBM rebranded the existing System/390 to IBM eServer zSeries with the e depicted in IBM's red trademarked symbol....
, pSeries, and xSeries.

A major resource of SHARE from the beginning was the SHARE library. Originally, IBM's operating systems were distributed in source form and it was common for systems programmers to make local modifications and to exchange them with other users. The SHARE library and the process of distributed development it fostered was one of the major origins of open source
Open source

Open source is an approach to design, development, and distribution offering practical accessibility to a product's source . Some consider open source as one of various possible design approaches, while others consider it a critical Strategy element of their business operations....
 software.

SHARE was later incorporated as a non-profit corporation based in Chicago, Illinois and is currently located at 401 N. Michigan Avenue
Michigan Avenue (Chicago)

Michigan Avenue is a major north-south street in Chicago which runs at 100 east south of the Chicago River and at 132 East north of the river from 12628 south to 950 north in the Streets and highways of Chicago.....
. The organization produces a newsletter and conducts two major educational meetings per year.

In September 1999, GUIDE International, the other major IBM mainframe users group, ceased operation. Although SHARE did not formally take over GUIDE, many of the activities and projects that were undertaken under the aegis of GUIDE moved to SHARE, and GUIDE suggested to its members that they join SHARE. In August 2000, SHARE took over the guide.org domain name.

Today, SHARE's membership of 20,000 represents some 2,300 enterprise IBM customers.

See also

  • History of free software
    History of free software

    This is a timeline-style look at how free software has evolved and existed from its inception....
  • SHARE Operating System
    SHARE Operating System

    The SHARE Operating System, also known as SOS, was created in 1959 as an improvement on the GM-NAA I/O operating system, the first operating system, by the SHARE ....
  • DECUS
    DECUS

    DECUS is an independent association of users of Hewlett-Packard and HP Partners. The membership association, registered in Munich, Germany, acts as part of the worldwide Association of Hewlett-Packard User Groups in Germany and Austria....


External links

  • at Charles Babbage Institute
    Charles Babbage Institute

    The Charles Babbage Institute is a research center at the University of Minnesota specializing in the history of information technology, particularly the history since 1935 of digital computing, programming/software, and computer networking....