These machines could only provide a finite number of winning combinations due to their comparatively simple design. When electromechanical slot machines were first introduced in the 1960s, the reels and payout mechanisms werkaise khelee powered by electrical components like motors and solenoids. This made it possible to create more intricate game designs with numerous paylines and bonus features. Random number generators (RNGs) and video displays are examples of even more sophisticated features made possible by the introduction of microprocessors to slot machine technology in the 1980s. Substantial computer software now powers all aspects of the game on modern slot machines.