ch05 - intro
5.1 - notes
5.1 - designing register machine
ex 5.1 - data path done
ex 5.1 - done
5.1.1 - register machine lang
ex 5.2 - done without verification
5.1.1 - actions
ex 5.3 - controller v1
ex 5.3 - controller v2
ex 5.3 - data path v1
ex 5.3 - data path v2
ex 5.3 - controller v3
ex 5.2 - add a TODO tag
ex 5.3 - done without verification
5.1.3 - subroutine
5.1.4 - design for using a stack
ex 5.4.a - controller
ex 5.4.b - controller
ex 5.4 - done without verification

yes there should be stacks in the graph.
Drawing these things are TOO BORING, I don't want to modify
it anymore, you get the idea.