You just have to buy one they have the same graphics as PS2 and Gamecube have which is 128 bits and the only thing I really don't like about it since it is the first CD game system sometimes when you are in the middle of playing a game it may just go to the system's main menu but that is very common if that happens just take the CD out and clean it by rubbing the CD on your shirt.  When you want to stop a game you first hit open and than take the game out than close the disk door than hit power because if you just hit power than open it up it will not put on the brake.  Which can damage the Dreamcast.