huh... I wonder if this could be a start for hacking a handheld PC?
Consider this.. Get a via nano board. sure a bit bigger then these... But hack the system in 1/2. then build/find a very small box that just fits the nano (maybe like a diamond with the points to the sides and top/bottom)
Next, attach the front of the yellow guy on the front of it and the back. You will be keeping the video and the buttons and the case only
Next, hack the video to the nano (probably going to be a composite in video... should be easy)...
Next hack the inputs...
Next... Add one of those DVD batteries on the back (the ones Ben Heck uses)...
Next... Add one of those solid state harddrives. Both the battery and the drive shouldn't be next to each other...but one on the back one on the front side? crap it in somewhere

... maybe make it a plug in port on the top??
Now you have a 1ghz machine with a TV output and arrow keys and 4 buttons. So any game you can get running in that.
So for the price of 40 bucks for the controller. 300 for the nano (maybe you could find a notebook motherboard laying around that would fit). And a bunch of hacking....