MOV AH,0FH 
  INT 10H
  MOV BL,AL 
  MOV AH,0 
  MOV AL,10H 
  INT 10H
  MOV AX,0 
  INT 33H
  MOV AX,01 
  INT 33H
  MOV AH,01 
  INT 21H
  MOV AX,2 
  INT 33H 
  MOV AH,0
  MOV AL,BL 
  INT 10H