This can generally increase the prospect of profitable, especially if two or extra reels are held. Modern slot machines are controlled by EPROM laptop chips and, in large casinos, coin acceptors have turn out to be obsolete in favor of bill acceptors. These machines and their bill acceptors are designed with advanced anti-cheating and anti-counterfeiting measures and are tough to defraud. Early computerized slot machines have been generally defrauded by way of using of} dishonest units, such as the "slider", "monkey paw", "lightwand" and "the tongue". Many of those old dishonest units 룰렛 have been made by the late Tommy Glenn Carmichael, a slot machine fraudster who reportedly stole over $5 million. In the modern day, computerized slot machines are fully deterministic and thus outcomes may be generally successfully predicted.