HAIEE. I HAVE WRITTEN SOME C CODE. AND I WANT TO SEE IT RUN. WHAT CAN I DO WITH IT?
"Get an electron microscope and sand off the top of your processor."
There's a nice simulation of a CPU executing code at:
http://visual6502.org/
It might only be a 6502 (ahhh, happy memories), but it shows what's going on under the hood pretty well.