CD-i member Michiel Roos shared a unique picture of a CD-i prototype player that he owns: This looks like a portable CD-i 360 player but there are some difference. In the first part, lots of wires are sticking out, probably for testing and development. It would be cool if anyone could tell us more about the meaning of all these wires. Next, and that is remarkable, there is a deep trackball located on the place where normally, in a regular CD-i 350 or CD-i 360, a D-pad button is placed. See the difference between our prototype on top and the retail version below.
[Thanks, Michiel Roos]