Modern casino Slots are controlled by computer chips and software, and the win %s are pre-programmed into the game software.
Casino slot games have RNGs which are eternally generating combos, even when the slot machine is not active.
Running side by side with the random # generator of the casino slot machine is the payout rate percent.
The payout per cent controls how much the slot machine game will pay, for example the pay out % could be 90%, meaning the one arm bandit will payout ninety per cent of all the bets played, and the casino simply gets to keep ten per cent.
This does not mean that each and every time you bet ten credits you will receive nine in return – where is the fun and excitement in that? Instead, the casino slot will not pay out for a while, and then suddenly start up a hot streak and you might hit a big grand prize.
The pay out percentages will definitely vary between the alternate games and some of the very popular casinos, like Golden Online Casino, which offers a pay out rate of up to 95 per cent!
Therefore, in essence, the slot machine game takes all the cash played into it and pays it out to a number of lucky winners. The casino only gets to keep a basically low % of all the wagers put out.
The casino one armed bandit software controls any part of the machine, from the flashing lights to the revolving of the reels.
When you hit spin on the one-armed bandit, a combination is set up by the RNG which corresponds to the pictures on the reel.