org	0
			ljmp	init

			org	0000bh
			inc	r0			;cycle r0
			reti

			org	00800h

init:			mov	th0,#4			;Load timer.
			mov	tl0,#4
			mov	tmod,#002h
			setb	tr0
			mov	ie,#082h		;ea, et0

			sjmp	$

			end