A landmark insofar as it was the first ARM-based computer. Planned as a successor to the Acorn BBC series of educational machines, it was a bit of a dead end in personal computing terms -- a British also-ran to the Amiga and Atari ST families -- but the descendants of its CPU are now the only personal computing architecture out there to still be competing with Intel (aaaand if you classify tablets as personal computers, they&#x27;re trouncing the x86 family on volume).