Chapter 5 contains a computer simulation that you can do on paper, which gives you a feel for how the computer itself actually works at the lowest level. If this really interests you, you can see my book on this, titled Programming from the Ground Up.
If you would like a worksheet to print out to make the simulation easier, click here.
Below is a video describing how to do the computer simulation:
On pg. 63, the second paragraph says “…and stores the result in register 2.” That should say “register 0.”