8086 ASSEMBLY LEVEL PROGRAM TO ADD TWO 64 BIT NUMBERS

;;LAB4
;;ENTER THE NUMBER IN MEMORY WHILE EXECUTING ;;PROGRAM 
CODE SEGMENT
ASSUME CS:CODE
START:
CLC
MOV SI,07
MOV CX,08
MOV BX,2009H
UP:
MOV AL,[SI]
MOV DL,[SI+8]
ADC AL,DL
MOV DS:[BX],AL
DEC SI
DEC BX
LOOP UP
MOV AH,0
ADC AH,00
MOV DS:[BX],AH
INT 3
CODE ENDS
END START
END