本书主要介绍用汇编语言进行程序设计，先从硬件和软件着手，然后介绍编程所需的各种指令，并给出丰富的范例。全书分为七大部分：PC机硬件、软件基础，汇编语言基础，屏幕与键盘操作，数据操作，高级输入／输出，特别主题，以及关于BI0S数据区、中断与端口、运算符与指令、PC指令系统等的参考资料。本书既可作为计算机及相关专业汇编语言课程的教材，也可作为开发人员的参考用书。要掌握本书内容，不仅要认真阅读本书的每个章节，还应使用本书提供的范例并尝试运行这些范例，并认真完成每章后面的练习。

   PREFACE

Part A Fundamentals of PC Hardware and Sofware

    I Basic FEATURES OF PC HARDWARE

      Introduction 1

      Bits and Bytes 1

      The Binary Number System 3

      Hexadecimal Representation 6

      ASCII Code 7

      PC Components 8

      Internal Memory 10

      Segments and Addressing 12

     Registers 13

     Hardware Interrupts 18

     Key Points 19

     Review Questions and Exercises 19

   2 INSTRUCTION ADDRESSING AND EXECUTION

     Introduction 22

     Features of an Operating System 22

      The BIOS Boot Process 23

      The System Program Loader 24

      The Stack 25

      Instruction Execution and Addressing 27

      Instruction Operands 29

      Protected Mode 29

      Key Points 30

      Review Questions and Exercises 30

        EXAMINING COMPUTER MEMORY AND EXECUTING INSTRUCTIONS

      Introduction 32

      Using the DEBUG Program 32

      Viewing Memory Locations 34

      Machine Language Example I:

     Using Immediate Data 36

      Machine Language Example II:

     Using Defined Data 40

      An Assembly Language Program 44

      Using the INT Instruction 45

      Using the PTR Operator 47

      Key Points 48

      Review Questions and Exercises 49

Part B Fundamentals of Assembly Language

    4 REQUIREMENTS FOR CODING IN ASSEMBLY LANGUAGE

      Introduction 51

      Assembly Language Features 52

      Conventional Segment Directives 58

      Simplified Segment Directives 62

      Initializing for Protected Mode 64

      Defining Types of Data 65

      Equate Directives 70

      Key Points 72

      Review Questions and Exercises 73

    5 ASSEMBLING,LINKING,AND EXECUTING PROGRAMS

      Introduction 74

      Preparing a Program for Assembling and Execution 74

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