Origins
Pseudo terminals were present in the DEC PDP-6 Timesharing Monitor at least as early as 1967, and were used to implement batch processing. They are described in the documentation for the succeeding TOPS-10 on the PDP-10. Other DEC operating systems also had PTYs, including RSTS/E for the PDP-11, as did the third-party TENEX operating system for the PDP-10.
Unix pseudo terminals originated in 1983 during the development of Eighth Edition Unix and were based on a similar feature in TENEX. They were part of the 4.2 release of BSD. AT&T's System V included support for pseudo terminals as a driver in their STREAMS device model, along with the pseudo terminal multiplexer.
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