Assembly Language Fundamentals

Assembly Language Fundamentals

1. Basic Elements of Assembly Language

   • Labels
   • Reserved words and identifiers
   • Character and string constants
   • Integer expressions
   • Integer constants
   • Directives and instructions
   • Mnemonics and Operands

2. Example: Adding and Subtractng iIntegers

3. Assembling, Linking, and Running Programs

   • Map File
     • Information about each program segment: starting address ending address size segment type
   • Assemble-Link-Execute Cycle
   • Listing File
     • source code addresses object code (machine language) segment names symbols (variables, procedures, and constants)

4. Defining Data

   • Intrinsic Data Types
   • Data Definition Statement
   • Defining BYTE and SBYTE Data
   • Defining WORD and SWORD Data
   • Defining DWORD and SDWORD Data
   • Defining QWORD Data
   • Defining TBYTE Data
   • Defining Real Number Data
   • Little Endian Order
   • Adding Variables to the AddSub Program

5. Symbolic Constants

   • Equal-Sign Directive
   • Calculating the Sizes of Arrays and Strings
   • EQU Directive
   • TEXTEQU Directive

6. Real-Address Mode Programming

   • Requirements INCLUDE Irvine16.inc Initialize DS to the data segment: mov ax,@data mov ds,ax
   • Generate 16-bit MS-DOS Programs
   • Advantages
   • Disadvantages

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