Microprocessor program - 8-BIT ADDITION

.DOSSEG
.MODEL SMALL
.STACK
.DATA
NUM1 DB 32H
NUM2 DB 43H
RES DB ?
.CODE
START:
MOV AX,@DATA
MOV DS,AX
MOV AX,0000H
MOV AL,NUM1
ADD AL,NUM2
MOV RES,AL
INT 21H
END START
END

RES
DB RES L1
1967;0006 75H