Greg Lemis wondered,
On page 182 of K&R 1st edition there's a
reference to an
implementation of C on the Honeywell 6000, with 9 bit bytes. There's
no mention of whether it was running UNIX.
That one was a C implementation under GCOS. There
was another 9-bit one for the PDP-10 (not using Unix).
There was a 4x9 bit version of Unix for the Univac 1100
series, which ran Unix as a guest system over the
native EXEC OS.
The most exotic version was the BBN C-machine, which
had 20-bit words, 10-bit bytes.
Dennis