;设内存1000H处放有两个3字节长的数据,求这两数的和(高位对高
;位,低位对低位).
DATA SEGMENT
ORG 1000H
H1 DB 11H,22H,34H
ORG 1010H
H2 DB 0AAH,0BBH,0CCH
ORG 1020H
H3 DB 4 DUP(?)
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START:  MOV AX ,DATA
        MOV DS,AX
        MOV SI,1000H
        MOV DI,1010H
        MOV BX,1020H
        MOV CX,3
        CLC
AA:     MOV AL,[SI]
        ADC AL,[DI]
        MOV [BX],AL
        INC SI
        INC DI
        INC BX
        LOOP  AA
        JNC   BB
        MOV BYTE PTR[BX],1
BB:     MOV AH,4CH
        INT 21H
CODE    ENDS
        END START