True, Midas is more a programmers OS (it doesn't really have a GUI for example). However, it IS a real Operating System. And yes, it makes use of bdos1/2.x. (no need to rewrite stuff that's already good) The rest is all custom code. It has everything an OS need; MMU, DRS, slothandling, interrupt handlers, music replay services, TSR. . etc.
so, yeah MIDAS is an O.S. and it was build in the early nineties, completely assembly ofcourse! the whole Sunrise Magazine series run on it, so do the Umax games (and ofcourse the fuzz stuff) I'm not sure to compare it with the mentioned O.S. types. Well it don't have a GUI, so for the most ppl it isn't interesting (again; itsa programmers os, so far) (although, it HAS a little command console.. hmmmmzzz)
@fly: you should have read the signs man. I've pointed out this o.s. a few times before, quess you just refused to listen 
@guyver; jalious? 
@guyver; jalious?
There's nothing to be jealous about...
hence the smilies 