evolving since then. PLEX was described in 2008 as "a cross between Fortran and a macro assembler."

The language has two variants: Plex-C used for the AXE Central Processor (CP) and Plex-M used for Extension Module Regional Processors (EMRP).

Ericsson started a project in the mid-1980s to create a successor language, which resulted in Erlang. According