DSEG SEGMENT
DATA1 DB 'A'
DATA2 DB 'A'
CNT DW 8
DSEG ENDS
CSEG SEGMENT
ASSUME CS:CSEG,DS:DSEG
START:MOV AX,DSEG
MOV DS,AX
MOV DL,31H ;1的ASCII码为31H
LEA SI,DATA1
LEA DI,DATA2
MOV CX,CNT
DEC SI
DEC DI
AGAIN:INC SI
INC DI
MOV AL,[SI]
CMP AL,[DI]
LOOPZ AGAIN
JZ DISP
DEC DL
DISP:MOV AH,2
INT 21H
MOV AH,4CH
INT 21H
CSEG ENDS
END START