Contents

1. Introduction
2. A bit of history
3. Lesson 1. Herbie
   1. 1.1. Idea: one slow machine
   2. 1.2. Assembly
   3. 1.3. Check
4. Lesson 2. The idle meter
   1. 2.1. Step 1: who is chosen — the CD4017
   2. 2.2. Step 2: is the chosen one busy — a multiplexer of AND and OR
   3. 2.3. Step 3: counting idle seconds — a CD4029 with enable
   4. 2.4. Step 4: clearing the meter
   5. 2.5. Assembly
   6. 2.6. Check
   7. Lesson 2 insert (Cmd+I)
5. Lesson 3. Release at Herbie's rhythm
   1. 3.1. Idea: a frequency divider on one flip-flop
   2. 3.2. Idea: a selector — the CD4019
   3. 3.3. Assembly
   4. 3.4. Check
   5. Lesson 3 insert (Cmd+I)
6. Lesson 4. The experiment: what to speed up
   1. 4.1. How to run them
   2. 4.2. Experiment 1: as it is
   3. 4.3. Experiment 2: speeding up the wrong machine
   4. 4.4. Experiment 3: speeding up Herbie
   5. 4.5. Why
   6. 4.6. Check
7. What happens and why
8. Summary
9. All the parts