Commodore 128: Troubleshooting and Repair

Description

In his most recent book, Commodore 128 Troubleshooting & Repair, Mr. Heilborn provides both experienced and novice users with a nuts-and-bolts look at the Commodore 128—how it works, what can go wrong, why, and how to make repairs. The first book to address C-128 troubleshooting and repair, it discusses: • The Commodore 128's design and electrical components • Systems and subsystems • Troubleshooting and step-by-step diagnostic techniques • How to make repairs • Preventive maintenance tips Preface ix Introduction: A New Generation xi Chapter I-A Look at the Commodore 128 1 System Design 1 Introduction to Troubleshooting Techniques 4 Chapter 2-Commodore 128 Systems and Subsystems 11 The Microprocessors 12 Memory 17 Input/Output 20 Summary 31 Chapter 3-Troubleshooting Techniques 33 Identifying Problem Areas 33 The Single-Path Method 34 Tools and Test Equipment 37 Repairs: Guidelines and Cautions 41 Soldering Techniques 43 Finishing Up 46 Chapter 4-Digital Logic Circuits 47 Logic Gates 47 Combining Logic Functions 49 Electrical Characteristics 51 Digital Memory Devices 52 Microprocessors 55 Chapter 5-Troubleshooting Techniques: System Doesn't Work 57 System Does Nothing 57 System Turns On, No Display, or Bad Display 59 System Turns On, No Keyboard Response 66 Strange or Inappropriate Messages or Garbage on Screen 69 Chapter 6-Troubleshooting Techniques: Poor Video or No Video 75 No Picture at All 75 No Color or Wrong Colors 79 Picture Rolls or Tilts 83 Chapter 7-Troubleshooting Techniques: Defective Keyboard 87 Keyboard Doesn't Work at All 87 Keyboard Generates the Wrong Characters 91 Chapter 8-Troubleshooting Techniques: Input/Output Problems 97 Disk Drive Problems 97 Cassette Problems 100 Game Controller Problems 102 Chapter 9-Preventive Maintenance 107 Looking for Trouble 107 Protecting the Life of Your Computer 107 Peripheral Devices 110 Disk Drives 114 A Few Final Notes 116 Appendix A-Integrated Circuit Pinouts 117 Appendix B-Board Layout 127 Appendix C-Input/Output Ports 129 Appendix D-System Specifications 131 Appendix E-Keyboard Codes 133 Glossary 135