As everyone with any urge to read this far likely knows, the 1980s were a very important time in the history of computing. IBM’s PC was released in 1981, setting the standard for personal computing for decades to come. The Apple Lisa in 1983 presaged the Mac and the whole revolution of the windows-icons-mouse graphical user interface that would dominate computing to come.
Acorn saw these developments happening and realized they would need something more powerful than the aging but reliable 6502 to power their future machines if they wanted to compete. Acorn had been experimenting with a lot of 16-bit CPUs: the 65816, the 16-bit variant of the 6502, the Motorola 68000 that powered the Apple Macintosh, and the comparatively rare National Semiconductor 32016.
None of these were really doing the job, though, and Acorn reached out to Intel to see about implementing the Intel 80286 CPUs into their new architecture.