Contents

1. Introduction
2. A bit of history
3. Lesson 1. The buffer counter
   1. 1.1. Idea: what the buffer is
   2. 1.2. Idea: subtracting by adding
   3. 1.3. Formula
   4. 1.4. Assembly
   5. 1.5. Check
   6. Lesson 1 insert (Cmd+I)
4. Lesson 2. The rope
   1. 2.1. Idea: release while the buffer is below the goal
   2. 2.2. Idea: comparing — the CD4585
   3. 2.3. Formula
   4. 2.4. Assembly
   5. 2.5. Check
   6. Lesson 2 insert (Cmd+I)
5. Lesson 3. Herbie with a die
   1. 3.1. Idea: a die at Herbie
   2. 3.2. Assembly
   3. 3.3. Check
6. Lesson 4. The experiment: push or pull
   1. 4.1. How to run it
   2. 4.2. Experiment 1: three ways
   3. 4.3. Experiment 2: Herbie sped up
   4. 4.4. Why
   5. 4.5. Check
7. What happens and why
8. Summary
9. All the parts