When I first got in touch with C it was in the early 1980's. I was a sysadmin at a Swedish telco operator (then THE Swedish Telco operator, Televerket, nowadays called Telia) for a system used for software development for a PABX system called A345 in Sweden, better known as Meridian in the rest of the world (co-developed by Televrket and Nortel). The Meridian system was the biggest of the non-custom built PABXes in those days. The language used to program it was called SL-1 (Switching Language 1) and the development system, like editors (vi / ined), compilers etc was running on a Unix system.

This sure was one of the earliest commercial uses for Unix, the Unix variant was version 6 and was not a BSD or anything like that, this was way before BSD really. Rather, the system was built by Interactive Systems which was the first commercial Unix

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