To write and execute an Assembly language Program (ALP) to 8086 processor to verify the password.
Aim:
To write and execute an Assembly language Program (ALP) to 8086 processor to verify the password.
Tools:
PC installed with TASM
Program:
.MODEL SMALL .STACK 45H ASSUME CS : CODE, DS : DATA DATA SEGMENT ORG 450H DB ‘ENTER THE PASSWORD’, ’$’ ORG 500H DB ‘‘STUDENTBOXOFFICE’,’$’ ORG 550H DB ‘INCORRECT PASSWORD’, ’$’ ORG 600H DB ‘PASSWORD IS CORRECT’, ’$’ CR EQU 0DH DATA SNDS CODE SEGMENT START: AGAIN: MOV AX, DATA MOV DS, AX MOV AH, 09H MOV DX, 450H INT 21H MOV SI, 400H MOV CX 0000H LP1: MOV AH, 00H INT 16H CMP AL, CR JE CHECK MOV [SI], AL MOV AH, 02H MOV DL, ‘*’ INT 21H INC SI INC CX JMP LP1 CHECK: CMP CX, 000BH JNE INCORR MOV SI, 400H MOV DI, 500H LP2: MOV AL, [SI] CMP AL, [DI] JNE INCORR INC SI INCDI LOOP LP2 MOV AH, 09H MOV DX, 600H INT 21H JMP EXIT INCORR:MOV AH, 09H MOV DX, 550H INT 21H EXIT: MOV AH, 4CH INT 21H CODE ENDS END START END
Result:
ENTER THE PASSWORD STUDENTBOXOFFICE’ PASSWORD IS CORRECT
Viva-voce questions:
1. What are the DOS function calls? 2. How a CALL instruction will be executed? 3. What is the role of stack? 4. What is the difference between DOS and BIOS interrupts? 5. What is an interrupt vector table of 8086?
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UpdatedOct 23, 2014
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Views17,161
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