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'''PLEX''' (Programming Language for EXchanges) is a special-purpose, concurrent, real-time [[programming language]]. The proprietary PLEX language is closely tied to the architecture of Ericsson's [[AXE telephone exchange]]s which it was designed to control. PLEX was developed by Göran Hemdahl at [[Ericsson]] in the 1970s,<ref name=ErlangHistory/> and 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= |publisher=Mälardalen University}}</ref> PLEX was described in 2008 as "a cross between [[Fortran]] and a [[Assembly_language#Macros|macro assembler]]."<ref>{{cite web|last1=Hague|first1=James|title=My Road to Erlang|url=https://prog21.dadgum.com/22.html|website=Programming in the 21st Century}}</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
Ericsson started a project in the mid-1980s to create a successor language which resulted in [[Erlang (programming language)|Erlang]]. According to co-creator [[Joe Armstrong (programmer)|Joe Armstrong]], "Erlang was heavily influenced by PLEX and the AXE design."<ref name=ErlangHistory/> Erlang did not replace PLEX, but was used alongside it.
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