COMPUTER ORGANIZATION & ASSEMBLY LANGUAGE LECTURE
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Assembly Programming
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COMPUTER ORGANIZATION & ASSEMBLY LANGUAGE LECTURE
- 1. COMPUTER ORGANIZATION & ASSEMBLY LANGUAGE LECTURE ON 21H WEEK 13 PRACTICAL BY MUHAMMAD JAFER 1
- 2. INT 21H • BIOS-ROM based • DOS INT 21H function Calls • Appendix D contains all of the functions • Displaying & Inputting Function 2
- 3. CHARACTER DISPLAY • Option 09 • DATA1 = ‘This earth is but one country’,’$’ • AH = 09 • DX = OFFSET DATA1 • INT 21H • Importance of $ • Option 02 • AH = 02 • DL = ‘J’ • INT 21H • Single Character 3
- 4. CHARACTER INPUT • Option 01 • AH = 01 • INT 21H • Result : AL= input Character • Echoing • Option 0AH • DATA1 DUP 6,?,6 (FF) • AH = 0AH • DX = OFFSET DATA1 • INT 21H • Buffer Concepts • 1st Byte = Size of Buffer • 2nd Byte = No of Characters • 3rd Bytes onwards = Data 4
- 5. CHARACTER INPUT (CONT) • Option 07 • AH = 07 • INT 21H • Result : AL= input Character • No Echo 5
- 6. LABEL DIRECTIVE • Name LABEL Attribute • JOE LABEL Byte • WORD,DWORD,FWORD,QWORD,TBYTE 6
- 7. CHAPTER REVIEW • The x86 PC Assembly Language, Design & Interfacing • Chapter # 4 • BIOS INT 21H PROGRAMMING 7