TITLE 	ADD TWO 8-BYTE NUMBER USING 32-BIT REGISTERS IN THE 386 
 PAGE 	60,132
 	.MODEL SMALL
 	.386
 	.STACK 200H			
 	.DATA
 DATA1 	DQ	548FB9963CE7H
 	ORG	0010H	
 DATA2 	DQ	3FCD4FA23B8DH
 	ORG	0020H
 DATA3 	DQ	?		
 	.CODE
 BEGIN: MOV     AX,@DATA
 	MOV	DS,AX
        CLC                             ;clear carry before first addition
 	MOV 	SI,OFFSET DATA1 	;SI is pointer for operand1 
 	MOV 	DI,OFFSET DATA2 	;DI is pointer for operand2 
 	MOV 	BX,OFFSET DATA3 	;BX is pointer for the sum 
        MOV     CX,02                   ;CX is the loop counter
 BACK: 	MOV 	EAX,DWORD PTR [SI] 	;move the operand to EAX 
 	ADC 	EAX,DWORD PTR [DI] 	;add the operand to EAX 
 	MOV 	DWORD PTR [BX],EAX 	;store the sum 
        INC     SI                      ;point to next dword of operand1
 	INC 	SI
 	INC 	SI
 	INC 	SI	
        INC     DI                      ;point to next dword of operand2
 	INC 	DI
 	INC 	DI
 	INC 	DI
 	INC 	BX	
        INC     BX                      ;point to next dword of sum 
 	INC 	BX
 	INC 	BX
        LOOP    BACK                    ;if not finished, continue adding
 	MOV 	AH,4CH
 	INT 	21H			;go back to DOS
 	END 	BEGIN