Got it. When I saw the squares it reminded me of magnetic core memory. I thought the squares were the punches but I can see it in this image[1]. [1] http://sta

Got it. When I saw the squares it reminded me of magnetic core memory. I thought the squares were the punches but I can see it in this image[1]. [1] http://static.righto.com/images/ibm-360-tros/tros-diagram.jpg http://static.righto.com/images/ibm-360-tros/tros-diagram.jp...