Little Man Computer

The Little Man Computer (LMC) is an instructional model of a computer, created by Dr. Stuart Madnick in 1965. It models a simple von Neumann architecture computer - which has all of the basic features of a modern computer. It can be programmed in machine code (albeit in decimal rather than binary) or assembly code. (according to Wikipedia).

A (hopefully) functioning simulator can be found at http://peterhigginson.co.uk/LMC/

Find some tutorials online (some good ones can be found at http://www.yorku.ca/sychen/research/LMC/ ) and test them on the Little Man Computer.

How a CPU works!

A very brief introduction into the makings and machinations of a basic CPU.