TITLE PROGRAM 5-1:KEYBOARD HIT USING INT 16H
  .MODEL SMALL
  .STACK
  .DATA
  MESSAGE DB 'TO STOP THE BELL SOUND PRESS ANY KEY$'
  .CODE
  MAIN PROC
  MOV AX,@DATA
  MOV DS,AX
  MOV AH,09
  MOV DX,OFFSET MESSAGE 
  INT 21H
AGAIN: MOV AH,02 
  MOV DL,07 
  INT 21H
  MOV AH,01 
  INT 16H 
  JZ AGAIN 
  MOV AH,4CH 
  INT 21H
  MAIN ENDP
  END