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Lab 2

Lab 2. Registers, Data Transfer Instruction, Basic Arithmetic Instruction, INT Instruction. Data Registers – General Purpose Registers. AX Accumulator Register BX Base Register CX Count Register DX Data Register. Segment Registers. CS Code Segment DS Data Segment SS Stack Segment

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Lab 2

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  1. Lab 2 Registers, Data Transfer Instruction, Basic Arithmetic Instruction, INT Instruction

  2. Data Registers – General Purpose Registers • AX Accumulator Register • BX Base Register • CX Count Register • DX Data Register

  3. Segment Registers • CS Code Segment • DS Data Segment • SS Stack Segment • ES Extra Segment

  4. Pointer and Index Registers • SP Stack Pointer • BP Base Pointer • IP Instruction Pointer • SI Source Index • DI Destination Index

  5. Data Transfer Instruction • MOV

  6. Data Transfer Instruction • XCHG

  7. Basic Arithmetic Instruction • ADD

  8. Basic Arithmetic Instruction • SUB

  9. Basic Arithmetic Instruction • INC • DEC

  10. INT Instruction • INT interrupt_number

  11. Exercises • Move 50h to AL and display it on screen. • org 100h • MOV AL,50H • MOV AH,2 • MOV DL,AL • INT 21H • ret • Declare a variable named word2 as a word, which contains 55h then display it on screen. • org 100h • MOV AH,2 • MOV DX,WORD2 • INT 21H • ret • WORD2 DW 55H

  12. Cont. Exercises • Add two numbers 5, 6 and move the result to CX. • org 100h • MOV AX,2 • MOV DX,3 • ADD AX,DX • MOV CX,AX • ret • Input a number (7) then move it to register BX • org 100h • MOV AH,1 • INT 21H • MOV BX,AX • ret

  13. Cont. Exercises • Input number 2 then add it to number 5 that is located in BL register then show the result on screen. • org 100h • MOV AH,1 • INT 21H • MOV BL,5 • ADD BL,AL • MOV AH,2 • MOV DL,BL • INT 21H • ret

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