Re: Best manual
Have an upvote for having been a Coherent user. I purchased it back in the day to run on old 286 (IIRC) when the other alternative (for x86) was considerably more expensive Interactive UNIX. Probably the only example I can think of from top of my head, where something rather cheap was very very good. Thanks MWC! It was few years later when Tanenbaum's MINIX started to emerge.