Developed by: DEC
Launched: 1968

TSS/8 is a time-sharing operating system co-written by Don Witcraft and John Everett at Digital Equipment Corporation in 1967.

TSS/8 was designed at Carnegie Mellon University with graduate student Adrian van de Goor, in response to the cost, performance, reliability, and complexity of IBM's TSS/360 (for its Model 67).

The operating system ran on the 12-bit PDP-8 computer (the first commercially successful minicomputer, with over 50,000 units sold) and was released in 1968.

DEC also referred to it as Timeshared-8 and EduSystem 50.