In August 1969, Ken Thompson and Dennis Ritchie from Bell Labs, dissatisfied with the size and complexity of the Multics OS, after a month of intense work, developed the first working prototype of an operating system , created in assembly language for the PDP-7 mini-computer. Around this time, a high-level programming language called B was developed, which evolved into the C language a few years later.
In early 1970, Brian Kernighan, Douglas McIlroy, and Joe Ossanna joined the project, with their participation leading to Unix being adapted for the PDP-11. In 1972, the developers abandoned assembly language and partially rewrote the system in the high-level B language, and over the next two years, the system was gradually completely rewritten in C, after which Unix's popularity in the university environment significantly increased.
Source: opennet.ru
