Slot machines’ technology has experimented many changes over the years. At the beginning they had a mechanical design, and nowadays that has been almost completely computerized. Although, the game is still basically the same.

The reel slot machine has a central metal shaft connected to a handle mechanism that holds the reels. That handle mechanism is the one that gives things movement. A braking system is needed to stop the reels after the spin, and also sensors to detect the reels position so they can tell the payout. Of course, that a coin detector is essential to detect that a coin has been inserted and that also unlocks the handle so it can be moved.

Conventional and electrical slot machines, work on similar principles. The big differences are that in an electrical machine, the spinning happens by a motor and the breakers that stop the spin are activated by solenoids. And of course, that they have more advanced money-handling systems.