a:	mov	ax, [fff0]
	mov	bx, [fff2]

	mov	cx, ax
	and	cx, bx
	mov	[fff8], cx

	mov	cx, ax
	or	cx, bx
	mov	[fffa], cx

	mov	cx, ax
	mov	dx, bx
	not	cx
	not	dx
	and	cx, bx
	and	dx, ax
	or	cx, dx 
	mov	[fffc], cx

	not	cx
	mov	[fffe], cx

	mov	ax, [fff4]
	cmp	ax, 0
	je	a
	halt