We did little Motorola 6800 schedulers in one class. A schedular is what I think of as an operating system.
LoseThos has a compiler. LoseThos is a full-time project. I have actual experience on a shipped professional OS. I'm in professional league unlike these amateurs:
http://wiki.osdev.org/Projects. Having my own compiler really separates me from the pack, doesn't it.
This guy thinks he's better than me.
http://forum.osdev.org/viewtopic.php?f=1&t=24203
You cannot support all graphics cards. You cannot do high res graphics without a GPU -- why do you think they make GPU's, are they pointless?
Let me Google that for you:
http://lmgtfy.com/?q=64-bit+operating+system