Non MS OSes in PC-Task?

[commodorejohn]

I don't know where you got your information from, but that's not anywhere close to being true.

Wikipedia corroborates Commodore licensing Amiga technology in exchange for REXX, but it doesn't say whether any of the AOS code actually made it into OS/2 or not. In any case, certainly Microsoft was involved.

[commodorejohn]

Getting back to the original question, there must be a bunch of embedded x86 OSes that don't require MMU functionality...

I can't remember whether Minix straight-up doesn't use the MMU or just doesn't require it, but I believe that's the case. And there's ELKS. Also, FreeDOS might be worth a shot.