标签：#retrocomputing

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 In 1984, King joined MetaComCo, a software company based in Bristol. He brought Tripos with him. The timing was perfect — Commodore was developing the Amiga, and they needed an operating system. The hardware was revolutionary: custom chips for graphics and sound, a Motorola 68000 CPU, and multitasking capabilities that put other home computers to shame. But the software wasn't ready. Tripos became the foundation of AmigaDOS. It wasn't a port in the traditional sense — the BCPL-based Tripos was adapted and integrated into the Amiga's environment, creating a hybrid system that combined the Amiga's custom hardware capabilities with Tripos's mature OS architecture. The result was a computer that could multitask in 1985, years before Windows or Mac OS could do the same. The Amiga shipped in 1985. AmigaDOS gave it a command-line interface, file system, and process management that were years ahead of anything else in the consumer market. The Amiga became