"NAND to Tetris" will give you a good grounding in the basics of hardware design, the low-levels of operating systems, implementation of languages. Basically, you get a good overview and practical experience tinkering with the whole thing.

http://www.reddit.com/r/programming/comments/7s383/from_nand...

I got the same thing from my CS education, but by accident. You can get it packaged neatly in one place from this course. This alone will put you in the top half of the programming community with regards to knowledge and overall understanding.