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'''PLEX''' (''Programming Language for EXchanges'') is a special-purpose, pseudo-parallel and event-driven real-time [[programming language]]. Dedicated for [[AXE telephone exchange]]s, it was developed by Göran Hemdahl at [[Ericsson]].<ref name=ErlangHistory>{{cite web |url= http://www.cs.chalmers.se/Cs/Grundutb/Kurser/ppxt/HT2007/general/languages/armstrong-erlang_history.pdf|title= A History of Erlang|accessdate=2009-03-07 |author= Joe Armstrong|date= |work= |publisher=Ericsson AB}}</ref> Originally designed in the 1970s, it has been continuously evolving since then.<ref name=Semantics>{{cite web |url= http://cdc.ioc.ee/appsem04/webproc/short/erikson-lisper.pdf|title= A Formal Semantics for PLEX|accessdate=2009-03-07 |author= Johan Erikson and Björn Lisper|date= |work= |publisher=Mälardalen University}}</ref> The language has two variants: ''Plex-C'' used for the AXE Central Processor (CP) and ''Plex-M'' used for Extension Module Regional Processors (EMRP).<ref name=Execution>{{cite web |url= http://www.mrtc.mdh.se/publications/0802.pdf|title= The Execution Model of APZ/PLEX - An Informal Description|accessdate=2009-03-07 |author= Johan Erikson and Bo Lindell|date= |work= |publisher=Mälardalen University}}</ref> PLEX was described in 2008 as "a cross between Fortran and a macro assembler."<ref>{{cite web|last1=Hague|first1=James|title=My Road to Erlang|url=http://prog21.dadgum.com/22.html|website=Programming in the 21st Century}}</ref>
==Pre-compilers==
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