org   	$1000
          	db    	$23,$55
		org	$1005
zero_cnt  	rmb   	1
lp_cnt    	rmb   	1

          	org   	$1500
          	clr   	zero_cnt	; initialize the zero count to 0
         	ldaa  	#16
          	staa  	lp_cnt	; initialize loop count to 16
          	ldd   	$800	; place the 16-bit number in D
again     	lsrd
          	bcs   	chk_end	; branch if the lsb is a 1
          	inc   	zero_cnt
chk_end   	dec   	lp_cnt
          	bne   	again	; have we tested all 16 bits yet?
forever   	bra   	forever
          	end