Modern casino slot machines are controlled by computer chips and software, and the winning percentages are pre-programmed into the game software.
Casino slot games have Random Number Generators which are continuously generating combos, even when the slot machine is not currently being played.
Running collectively with the random # generator of the casino slot machine is the pay out percent.
The payout % controls how much the slot machine game will pay, for e.g. the pay % might be 90%, which means the one arm bandit will pay out ninety percent of all the bets played, and the casino only gets to keep ten percent.
This does not mean that every time you bet 10 credits you will receive nine in return – where is the fun and fascination in that? Instead, the casino slot just will not payout for a bit, and then suddenly go on a hot streak and you might hit a big jackpot.
The payoff %s will very likely vary between the different games and just a few of the notably popular casinos, such as Golden Online Casino, which tenders a pay out rate of up to ninety-five %!
Therefore, in essence, the one-armed bandit takes all the $$$$$ played into it and pays it out to a handful of privileged winners. The casino only gets to keep a averagely tiny percent of all the bets made.
The casino slot machine software controls every part of the machine, from the blinking lights to the turning of the reels.
When you hit spin on the slot machine game, a combination is generated by the RNG which is linked to the pictures on the reel.