Released September 1995 The 3DO sported some very innovative features. The fact that it is a CD-based system gave developers nearly limitless space to store their games and programs, something cartridge-based systems lack. There was only one controller port. However, this wasn't a problem since extra controllers (up to 8) could be easily daisy-chained as each controller has its own controller port. The original Panasonic controllers have a built-in stereo headphone jack along with a volume control dial. The system has its own internal memory to save games and other information. It has 2 expansion ports which were to be used for future upgrades such as memory cards, modems, digital video cartridges and the M2 system upgrade.
There were many accessories for the 3DO, some of them standard (like game pads, wireless controllers and a light gun). Then there were more unique items like the mouse, steering wheel, flight stick and the Super Nintendo controller adapters which allowed the cheaper Super NES controllers to be used on the 3DO. However, there were even more impressive items available that truly allowed the 3DO to stand alone.