A Cambridge Student Writes an Operating System
In the late 1970s, a Cambridge computer science student named Tim King needed an operating system for the Cambridge LISP machine. What he built instead was Tripos — a preemptive multitasking operating system written in BCPL that would, improbably, end up powering one of the most beloved home computers of the 1980s.
King earned his Ph.D. at Cambridge in 1979. Tripos wasn't a university project exactly — it was born of necessity, the kind of system building that Cambridge encouraged. It was compact, fast, and remarkably capable for something written by a single person. It had a kernel, file system, windowing system, and a command-line interpreter, all in BCPL.
What made Tripos special wasn't just that it worked — it was that it worked well. Preemptive multitasking in the 1970s was serious engineering. Most personal computers of the era couldn't do it at all. The Amiga wouldn't ship for another six years, and when it did, Tripos would be at its core.
From Cambridge to MetaComco
