.MODEL SMALL
  .STACK 64
  .DATA
  DATA1 DB 52H
  DATA2 DB 29H
  SUM DB ?
  .CODE
  MAIN PROC FAR 
  MOV AX,@DATA 
  MOV DS,AX 
  MOV AL,DATA1 
  MOV BL,DATA2 
  ADD AL,BL 
  MOV SUM,AL 
  MOV AH,4CH 
  INT 21H 
  MAIN ENDP
  END MAIN