BACHELOR OF COMPUTER APPLICATIONS
Course Code : BCSL-022
Course Title : Assembly Language Programming Lab
Assignment Number : BCA(II)/L-022/Assignment/2015
Maximum Marks : 50
Weightage : 25%
Write and run (using appropriate calling program) a near procedure in assembly language that converts a packed 2 digit BCD number stored in AL register to equivalent Binary number. For example, if AL contains a packed BCD number 64 as 0110 0100, then the program will convert this BCD to equivalent binary number 01000000. The binary number should be returned back in the AL register itself.
DATA SEGMENT
MSG1 DB “ENTER NUMBER : $”
DIGIT1 DB ?
DIGIT2 DB ?
BINARY DB ?
DATA ENDS
CODE SEGMENT
ASSUME DS:DATA,CS:CODE
START:
MOV AX,DATA
MOV DS,AX
LEA DX,MSG1
MOV AH,9
INT 21H
MOV AH,1
INT 21H
SUB AL,30H
MOV DIGIT1,AL
MOV AH,1
INT 21H
SUB AL,30H
MOV DIGIT2,AL
MOV AH,DIGIT1
MOV AL,DIGIT2
MOV CL,4
ROL AH,CL
ADD AL,AH
CALL CONVERT
MOV BINARY,AL
MOV AH,4CH
INT 21H
CODE ENDS
CONVERT PROC NEAR
MOV AH,0
MOV BL,AL
AND AL,0F0H
AND BL,0FH
MOV CL,04H
ROL AL,CL
MOV CL,10
MUL CL
ADD AL,BL
RET
CONVERT ENDP
END START
Program Code :
[codesyntax lang=”asm” lines=”normal”]
DATA SEGMENT
MSG1 DB “ENTER NUMBER : $”
DIGIT1 DB ?
DIGIT2 DB ?
BINARY DB ?
DATA ENDS
CODE SEGMENT
ASSUME DS:DATA,CS:CODE
START:
MOV AX,DATA
MOV DS,AX
LEA DX,MSG1
MOV AH,9
INT 21H
MOV AH,1
INT 21H
SUB AL,30H
MOV DIGIT1,AL
MOV AH,1
INT 21H
SUB AL,30H
MOV DIGIT2,AL
MOV AH,DIGIT1
MOV AL,DIGIT2
MOV CL,4
ROL AH,CL
ADD AL,AH
CALL CONVERT
MOV BINARY,AL
MOV AH,4CH
INT 21H
CODE ENDS
CONVERT PROC NEAR
MOV AH,0
MOV BL,AL
AND AL,0F0H
AND BL,0FH
MOV CL,04H
ROL AL,CL
MOV CL,10
MUL CL
ADD AL,BL
RET
CONVERT ENDP
END START
[/codesyntax]
Screen shots :-
After Execution :
