PL-11

{{Short description|PL-11 Programming}}

{{for multi|the New Zealand aircraft|Bennett Airtruck|the Chinese missile|PL-11 (missile)}}

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. {{cite report|author=Carpenter, Brian E.|publisher=Massey University Computer Unit|year=1974|title=A PL-11 Package on the Burroughs B6700|url=https://natlib.govt.nz/records/21899158|accessdate=2025-03-12}}

A report describing the language is available from CERN.{{cite report|author=Russell, Robert D.|editor=T. C. Streater|publisher=CERN|year=1974|title=PL-11: A Programming Language for the DEC PDP-11 Computer|url=https://cds.cern.ch/record/880468/files/CERN-74-24.pdf|accessdate=2014-05-02}}