Unit 1 Recapitulate of Computer Development 1
Unit 2 Computer System 9
Unit 3 Categories of Computers 17
Unit 4 Data Representation 24
Unit 5 Computer Hardware 32
Unit 6 Central Processing Unit 41
Unit 7 Memory 48
Unit 8 Storage Devices 56
Unit 9 Expansion Slots,Cards,and Ports 63
Unit 10 Input Devices 71
Unit 11 Output Devices 79
Unit 12 System Software 87
Unit 13 Application Software 94
Unit 14 User Interface 102
Unit 15 Programming Language Characteristics 111
Unit 16 How People Make Programs 119
Unit 17 Science of Computing 127
Unit 18 Viruses and Other Invaders 135
Unit 19 Local Area Networks 143
Unit 20 The Internet 150
Unit 21 Multimedia 157
Unit 22 Artificial Intelligence 166
Unit 23 Database 174
词汇表 183
Key to Exercises 198