求找错，汇编语言的
DATA SEGMENT
S1 DB 2 DUP(?)
S2 DB 2 DUP(?)
S3 DB 5 DUP(?)
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
START: MOV AX,DATA
MOV DS,AX
MOV ES,AX
MOV SI,OFFSET S1
MOV DI,OFFSET S2
MOV AH,01H
INT 21H
MOV [SI+1],AL
MOV AH,01H
INT 21H
MOV [SI],AL

MOV AH,02H
MOV DL,'+'
INT 21H


MOV AH,01H
INT 21H
MOV [DI+1],AL
INT 21H
MOV [DI],AL


MOV AH,02H
MOV DL,'='
INT 21H
CODE ENDS
END START


[解决办法]
至少程序的最后没有进行“结束程序返回DOS”

  mov  ah, 4ch
  int  21h