From what I gathered, This was supposed to be a portable unit and originally was supposed to be a square unit but was changed to round like a watchman's clock to reduce damage when dropped. Here are two pictures:
This picture shows a game:
http://www.dreamcast-scene.com/uploa...yager-03.p.jpg
This one shows the controller and a box (CGI Image)
http://features.cgsociety.org/newgal...1137977399.jpg
Anyone here know more about this?