In the 1980s in the U.K., devices personifying microprocessors came to be common. These used a number of features to guarantee the payout was regulated within the restrictions of the gaming regulations. The drums themselves were driven by stepper electric motors, regulated by result sgp the processor and with proximity sensing units keeping an eye on the placement of the drums. A “look-up table” within the software program enables the cpu to recognize what symbols were being displayed on the drums to the casino player. This permitted the system to control the level of payout by quiting the drums at placements it had actually figured out.