[konidias]

There was also the power pad (which idea is now used heavily with DDR) and the virtual boy... and while that didn't work out too well, it was at least a lot different than what everyone else was doing.

Also the original gameboy... which pretty much set the stage for every handheld to follow.

What hardware has sony or x-box invented that could change gameplay so much? (that a PC didn't do already)

edit: there was also...

gameboy camera (which I think was the first camera accessory for a portable game system)

broadcast satellaview (which was made for the SNES and allowed japanese players the ability to download games via satellite.... there was actually a version of link to the past for this)

and the gameboy printer