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{{Infobox organization
'''SHARE Inc.''' is a volunteer-run user group for [[IBM]] [[mainframe computer]]s that was founded in 1955 by [[Los Angeles]]-area [[IBM 701]] users. It evolved into a forum for exchanging technical information about [[programming language]]s, [[operating system]]s, [[database system]]s, and user experiences for enterprise users of small, medium, and large-scale [[IBM computer]]s such as [[System/360|IBM S/360]], [[System/370|IBM S/370]], [[zSeries]], [[pSeries]], and [[IBM System x|x]]Series. ▼
| name = SHARE
| logo = SHARE logo (2021).png
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| formation = {{Start date and age|1955}}
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| tax_id = <!-- or | vat_id = (for non-profit org) -->
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| purpose = [[Users' group|User group]] for [[IBM]] [[mainframe computer]]s
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| location = [[Los Angeles]]-area
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▲'''SHARE Inc.''' is a volunteer-run [[Users' group|user group]] for [[IBM]] [[mainframe computer]]s that was founded in 1955 by [[Los Angeles]]-area users of the [[IBM
==Overview==
A major resource of SHARE from the beginning was the SHARE library. Originally, IBM
</ref> and it was common for [[systems programming|systems programmers]] to make small local additions or 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]] software.<ref>{{cite web |url=http://www.soa-pipeline.com/news/169400167 |archiveurl=http://web.archive.org/web/20060324140930/http://www.soa-pipeline.com/news/169400167 |archivedate=March 24, 2006 |title=SHARE, IBM User Group, To Celebrate 50th Anniversary |first=David |last=Gardner |publisher=TechWeb News |date=August 17, 2005}}</ref>▼
[http://www.cozx.com/~dpitts/ibm7090.html Dave Pitts' IBM 7090/7094 Page] {{webarchive|url=https://web.archive.org/web/20150827134534/http://www.cozx.com/~dpitts/ibm7090.html |date=2015-08-27 }} – An example of distributed source: Page contains a link to [[IBM 7090/94 IBSYS]] source, including COBOL and FORTRAN compilers.
</ref>
▲
In 1959 SHARE released the [[SHARE Operating System]] (SOS), originally for the [[IBM 709]] computer, later ported to the [[IBM 7090]]. SOS was one of the first instances of "[[commons-based peer production]]" now widely used in the development of [[free and open-source software]] such as [[Linux]] and the [[GNU project]]. In 1963 SHARE participated with IBM in the development of the [[PL/I]] programming language as part of the "3x3" committee.
SHARE was later incorporated as a non-profit corporation based in [[Chicago, Illinois]] and is currently located at 401 N. [[Michigan Avenue (Chicago)|Michigan Avenue]]. The organization produces a newsletter and conducts two major educational meetings per year.▼
In 1969, members of SHARE in Europe formed a European Chapter of the organisation, which was formalised in 1966 as the "Share European Association (SEAS)", later SHARE Europe (SEAS).<ref>{{cite web|url=https://www.daube.ch/share/seas01.html|title=30 Year History of SEAS / SHARE Europe|date=March 1992|first=Harry|last=Hurst}}</ref> The last meeting of 1994 was jointly held with G.U.I.D.E. At this meeting it was decided to dissolve both SHARE Europe and G.U.I.D.E. and establish the new European IBM users group GSE (Guide Share Europe).
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. ▼
▲SHARE
Today, SHARE's membership of 20,000 represents some 2,300 enterprise IBM customers.<ref>{{cite news |url=http://www.computerworld.com/hardwaretopics/hardware/mainframes/story/0,10801,100119,00.html |title=Share user group looks back at 50 years with buttons, ditties |publisher=Computerworld |first=Patrick |last=Thibodeau |date=March 2, 2005}}</ref>▼
▲In September 1999, [[GUIDE International]], the other major IBM mainframe users group, ceased operation. Although SHARE did not formally take over GUIDE in the United States, 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.
▲
</ref>
==See also==
*[[History of free software]]
*[https://www.daube.ch/share/seas01.html History of SHARE Europe] .
*[[IBM Type-III Library]]
*[[DECUS]]
*[[Seven tiers of disaster recovery]]
*[[COMMON]]
==References==
{{Reflist|2}}
==Further reading==
* {{cite book |title=SHARE Reference Manual for the IBM 704 |date=1959-04-15 |orig-year=August 1956 |editor-first1=Joanne |editor-last1=Edson |editor-first2=John |editor-last2=Greenstadt |editor-first3=Irwin |editor-last3=Greenwald |editor-first4=Fletcher R. |editor-last4=Jones<!-- possibly, but needs confirmation: |editor-link4=Fletcher Roseberry Jones --> |editor-first5=Frank V. |editor-last5=Wagner |url=http://www.piercefuller.com/scan/share59.pdf?id=share59 |access-date=2020-06-16 |url-status=live |archive-url=https://web.archive.org/web/20120304181143/http://www.piercefuller.com/scan/share59.pdf?id=share59 |archive-date=2012-03-04}}
==External links==
* {{Official website|http://www.share.org}}
* [http://www.piercefuller.com/library/share.html SHARE Library]
* [http://purl.umn.edu/
* [http://purl.umn.edu/
▲*[http://purl.umn.edu/41154 GUIDE International Records, 1970-1992] at [[Charles Babbage Institute]], University of Minnesota.
{{IBM}}
{{IBM FOSS}}
[[Category:IBM user groups]]
[[Category:User groups]]
[[Category:Free software culture and documents]]
[[Category:Organizations based in Chicago
[[Category:Organizations established in 1955]]
[[Category:1955 establishments in California]]
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