Hi Diomidis,
The Bell Labs team took the bold approach of adopting
the draft
Unicode standard and an X-Open proposal for encoding multibyte
characters only using bytes with the top bit set. At the time the
encoding was known as UTF-2; it is what we now call UTF-8.
Rob and Ken altered Dave Prosser's FSS-UTF rather than just adopting an
existing proposal, according to
https://en.wikipedia.org/wiki/UTF-8#History
More history, including Bell Labs emails from ’92:
https://www.cl.cam.ac.uk/~mgk25/ucs/utf-8-history.txt
--
Cheers, Ralph.