MOV	 TMOD,#20H	
		MOV	 TH1,#-3	
		MOV	 SCON,#50H	
		SETB	 TR1		
AGAIN:	MOV	 A,#"Y"	
		ACALL TRANS	
		MOV	 A,#"E"	
		ACALL TRANS	
		MOV	 A,#"S"	
		ACALL TRANS	
		SJMP	 AGAIN	
TRANS:	MOV	 SBUF,A	
HERE:		JNB	 TI,HERE	
		CLR	 TI		
		RET