[cstross]

Oh wow, it ran MWC Coherent!

I still have a (printed on dead trees!) manual for Coherent 3.2 (286 version, circa 1990-91) kicking around. Ran multiuser (login via tty or virtual terminals on the console) in 640Mb of RAM, off a 10Mb fully installed setup. If I remember correctly you were limited to 64Kb code & 64Kb data per process, though ... (Coherent 4.0 removed the addressing limit).