计算机专业英语PDF电子书下载

1 You and Computer Competency 2

End Users and Computer Competency 3

Four Kinds of Computers 3

The Five Parts of an Information System 5

Software 6

Hardware 8

Data 12

Connectivity 12

A Look at the Future:You and Computer Competency 13

2 Applications Software:Basic Tools 20

General-Purpose Applications Packages 20

Word Processors 22

Spreadsheets 24

Database Managers 27

Graphics 29

Communications 31

Integrated Packages and Software Suites 33

A Look at the Future 34

3 Systems Software 40

Why Learn About Systems Software? 40

Four Kinds of Programs 42

DOS:The Personal Computer Standard 44

Windows 46

Windows NT 48

OS/2 49

Macintosh Operating Systems 50

Unix:The“Portable”Operating System 52

A Look at the Future 54

4 The Processing Unit 60

The CPU 60

Memory 61

The Binary System 62

The System Unit 66

The Four Types of Computer Systems 75

A Look at the Future 81

5 Input and Output 88

Input:Keyboard Versus Direct Entry 88

Keyboard Entry 89

Direct Entry 90

Output:Monitors,Printers,Plotters,Voice 97

Types of Monitors 97

Printers 100

Plotters 104

Voice-Output Devices 105

A Look at the Future 106

6 Secondary Storage 112

Four Kinds of Secondary Storage 112

Floppy Disks 113

Hard Disks 117

Optical Disks 120

Magnetic Tape 122

A Look at the Future 124

7 Communications and Connectivity 130

Communications and Connectivity 131

National Information Highway and internet 136

User Connection 138

Communications Channels 139

Data Transmission 141

Network Architecture 144

Network Types 146

A Look at the Future 148

8 Files and Databases 154

Files 154

Database 158

DBMS Organization 160

Types of Databases 162

Database Uses and lssues 165

A Look at the Future 166