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PL-11

high-level machine-oriented programming language

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Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJun 23, 2026
Entity authorityQ7119550
Source-derived summary

PL-11 is a high-level machine-oriented programming language for the PDP-11, developed by R.D. Russell of CERN in 1971. Written in Fortran IV, it is similar to PL360 and is cross-compiled on other machines.

PL-11 was originally developed as part of the Omega project, a particle physics facility operational at CERN (Geneva, Switzerland) during the 1970s. The first version was written for the CII 10070, a clone of the XDS Sigma 7 built in France. Towards the end of the 1970s it was ported to the IBM 370/168, then part of CERN's computer centre. In 1974, it was ported to the Burroughs B6700 at Massey University in New Zealand.

Editorial summary

This brief starts where responsible research should: with the source description of “PL-11” as high-level machine-oriented programming language. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current lead gives the account dated anchors—1971, 1974—that can be checked directly. The linked authority record independently contributes the date 1971. The account is most persuasive where PL-11, high-level and machine-oriented can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as high-level machine-oriented programming language. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

Vocabulary and entity names are the principal evidence signals here, because they determine the precision of every later search. The source revision retrieved here is dated Jun 23, 2026. The linked authority identifier is Q7119550. None of the 1 selected statements returned an explicit reference. The first chronological checks are 1971 and 1974.

Critical limits

Overview language is designed for orientation and should not be treated as a substitute for the evidence cited beneath it. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

Best used for
  • Subject orientation
  • Search vocabulary
  • Locating named sources
Verify next

The closest primary source, responsible institution and strongest cited specialist reference.

Three-step research path

  1. Establish the record: confirm the title “PL-11”, its source revision and the description used here.
  2. Expand the search: follow PL-11 primary sources, PL-11 archive and PL-11 research across catalogues and specialist indexes.
  3. Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.

Questions for further research

  1. Which source most directly establishes the central claim about “PL-11”?
  2. Which institution is responsible for the underlying evidence?
  3. Which cited source is closest to the event, object or claim?
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Source & attribution

This entry incorporates text from PL-11” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.