- * full of surprises (as in, its so unreliable I'm scared to run it on a VM )
* a "filesystem"
* networking...ish.
* what could be considered paging if you had never seen a working implementation of paging before.
* as soon as the scheduler stops crashing, multi-tasking.
https://github.com/r0nk/r0nix
On a more serious note, I've learned a ton writing r0nix and I don't at all regret the all-nighters I've put into it. I now know a considerable amount more then when I've started, and I can now read through systems code without being overwhelmed. I found that, for the most part, I've gone over the learning curve of operating system development (not to say that I've come close to mastering it).
I've recently begun to explore a few other projects, so I'll no longer be working on r0nix all day every day. I'll still try to develop it, however, as I still want it to become a full unix clone. Any contributions are definitely welcome, along with any feedback/criticism.
Also, if you read the source: http://i.imgur.com/6Qk7B.png