Modern casino Slots are controlled by a computer, and the winner percentages are pre-programmed into the computer software.
Casino Slots have RNGs which are constantly generating combos, even when the game is not currently being played.
Running synchronously with the random # generator of the casino slot machine game is the pay out rate percentage.
The payout percent controls just how much the one-armed bandit will pay, for eg the pay out percent may be ninety per cent, meaning the slot machine game will payout 90% of all the stakes played, and the casino simply gets to keep ten percent.
This is not to say that every time you bet ten credits you will receive nine in return – where’s the fun … thrill in that? Instead, the casino slot just won’t pay out for a little while, and then suddenly go on a hot streak and you might catch the big jackpot.
The pay off %s will vary between the different games and some of the notably common casinos, e.g. Golden Online Casino, which gives a payout rate of up to 95 %!
Thus, in essence, the one-armed bandit takes all the cash played into it and pays it out to several lucky winners. The casino only gets to keep a basically indistinct percentage of all the plays allotted.
The casino slot machine software controls every single part of the machine, from the flashing lights to the circulating of the reels.
When you hit spin on the slot machine game, a combination is developed by the RNG which is linked to the pictures on the reel.