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> it was also the name of an innovative (at that time) operating system

it was also an example of a complete system (from hw through os + dev tools to apps) which had been developed by only two people.

I thoroughly enjoyed Wirth's excuse for an FPGA re-implementation: "no commercial machines would talk to my favourite mouse —given to me as a parting gift from my Xerox sabbatical— so I built a workstation that would"

(He once gave a slideshow of the workstations he'd designed over the years, and although the displays got bigger, and the cpu and storage got smaller, the mouse remained the same...)