I think that a prototype of the Tetsujin aka Iron Man board would be an astonishing find, if there are any around. this board pre-dates the PC-FX but is said to be much more powerful than the PC-FX which only incorporated a fraction of the Tetsujin / Iron Man technology. Tetsujin / Iron Man board http://members.tripod.com/~faberp/IronMan.htm
Yeah that thing looked very cool... I wonder what the specs are? Maybe it'll pop up on Yahoo Japan one day :smt043
Shame there aren't more pics of stuff, you only ever see that board pic and the showoff of its morphing capabilities of a man turning into a woman.
... if i remember correctly assembler used to have a NEC system prototype.I think it was a very early iron man but i may be wrong.But i am almost 90% sure he had such a proto.