Yes, and before that there was polyForth. I had a summer job working on it in 1986 -- there were three variants for the PC, to either run under DOS or boot to i

Yes, and before that there was polyForth. I had a summer job working on it in 1986 -- there were three variants for the PC, to either run under DOS or boot to it directly and use or skip the BIOS. Had preemptive threading with no memory protection, but on the 8086 what can you do? Sometimes we'd run it multi-user, such as for a class, and then any student could crash it, and we'd just reboot. This happened, of course, but surprisingly (looking back) not enough to make a big nuisance. The programming environment on a system like this feels kinda like a cut-down Smalltalk or Lisp, in the sense of a live environment with all the code accessible and tweakable.