LDS 	#RAMEnd+1		
  	BSET  DDRB,%11111111      
	LDAA 	#$90		
	STAA	TSCR1			
	LDAA 	#$07		
	STAA	TSCR2			
	BSET	TIOS,%00000001	
	LDAA 	#$00			
	STAA	TCTL2			
	LDAA	#$55
OVER	STAA	PORTB
	JSR	DELAY
	COMA				
	BRA	OVER
DELAY	PSHA 
  LDD	TCNT			
	ADDD	#15625			
	STD	TC0			
HERE	BRCLR	TFLG1,mTFLG1_C0F,HERE	
	PULA
	RTS