sum

.MODEL SMALL
.STACK 100H
.DATA
  A DB 3
  B DB 2
  S DB ?
.CODE
.STARTUP
  MOV AL,A ;AL=A
  ADD AL,B ;AL=AL+B
  MOV S,AL ;S=AL
  MOV BL,S
  MOV AH,4CH
  INT 21H
 END