V6/usr/source/s2/update.s

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	sys	fork
		br 1f
	sys	exit
1:
	clr	r0
	sys	close
	mov	$1,r0
	sys	close
	mov	$2,r0
	sys	close
1:
	sys	sync
	mov	$30.,r0
	sys	sleep
	br	1b
sleep = 35.
sync = 36.