Modern casino Slots are controlled by computer chips and software, and the win %s are preprogrammed into the software.
Casino slot machine games have Random Number Generators which are eternally generating combinations, even when the machine is not currently being played.
Running synchronously with the random # generator of the casino slot machine is the pay out rate %.
The payout percentage controls just how much the one-armed bandit will pay, for e.g. the pay per cent may be 90%, which means the slot machine game will payout 90% of all the bets played, and the casino only gets to keep 10 per cent.
This doesn’t mean that every time you bet ten credits you will receive nine in return – where is the fun and thrill in that? Instead, the casino slot machine will not payout for a bit, and then suddenly hit a hot streak and you might catch the big top prize.
The payoff percentages most likely will vary between the a variety of games and some of the most established casinos, for e.g Golden Online Casino, which provides a payout of up to 95 percent!
Therefore, in essence, the slot machine game takes all the dough played into it and pays it out to a couple of privileged winners. The casino only gets to keep a fairly tiny percent of all the odds placed.
The casino one armed bandit software controls every part of the machine, from the flashing lights to the circulating of the reels.
When you hit spin on the one-armed bandit, a combination is generated by the RNG which relates to the pictures on the reel.