TITLE PROGRAM 4-5:KEYBOARD HIT USING INT 16H
;THIS PROGRAM SOUNDS THE BELL CONTINUOUSLY UNLESS ANY KEY IS PRESSED
        	.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   ;DISPLAY THE MESSAGE
        	INT 		21H
AGAIN:  	MOV 	AH,02               	;SENDING TO MONITOR A SINGLE CHAR 
INT 		21H
      	 	MOV 	AH,01              	;CHECK THE KEY PRESS
       		INT 		16H                 	;USING INT 16H
        	JZ 		AGAIN                	;IF NO KEY PRESS STAY IN THE LOOP
       		MOV 	AH,4CH             	;IF ANY KEY PRESSED GO BACK TO DOS
      	 	INT 		21H
MAIN    	ENDP
        	END