Just to let you all know, that large device turned out to be a way to flip the video horizontally to a mirror image (left is right and right is left). As I understand it, the monitor is mounted in such a way that the video is reflected off of a mirror. Without the box, the video would be normal and the monitor could be used in another game by plugging the yoke ("yolk", on the printed circuit board) connector directly to the PCB instead of going through the box..
Every day presents an opportunity to learn something new, even for those of us who are chronologically challenged (aka, old).
Richard