将0至100中的偶数求和，结果送SUM字单元。

DATA SEGMENT
    SUM DW ?
DATA ENDS
CODE SEGMENT
    ASSUME CS:CODE,DS:DATA
START:MOV AX,DATA
      MOV DS,AX
      MOV AX,0
      MOV DX,2
      MOV CX,50
AGAIN:ADD AX,DX
      INC DX
      INC DX
      LOOP AGAIN
      MOV SUM,AX
      MOV AH,4CH
      INT 21H
CODE ENDS
    END START