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The language was an inter-service standard for British military programming, and was also widely adopted for civil purposes in the British control and automation industry.

It was used to write software for both the Ferranti and GEC computers from 1971 onwards.

Implementations also exist for the Interdata 8 / 32, PDP-11, VAX, Alpha platforms and HP Integrity servers ; for the Honeywell, and for the Computer Technology Limited ( CTL, later ITL ) Modular-1 ; as well as for SPARC running Solaris and Intel running Linux.