1. 2Computer Organization
   1. 2.1Processors and Memory
      1. 2.1.1Processor Registers
      2. 2.1.2Instruction format
   2. 2.2Two Simple Programs
   3. 2.3Machine Language Program
   4. 2.4How the Computer Executes a Program
      1. 2.4.1Processor Flow Chart
      2. 2.4.2Executing a Program
   5. 2.5A Scheme Model of the Computer.
      1. 2.5.1The Memory Model
      2. 2.5.2The Processor Model
      3. 2.5.3A Scheme Session Using the Computer Model
      4. 2.5.4rep and list-subst