Anyone ever seen one of these before?

IMGP0729, originally uploaded by epredator.

I have been looking at some of my old gadgets, getting a bit retro to help Sophie learn some stuff. The PC is an obvious vehicle, but this little gizmo I used to find fascinating and I have never seen one anywhere else.
Of course now I just googled it and it still exists.
Now I neeed to see if we can get some more cards for it.