Modern casino slot games are controlled by computer chips and software, and the win %s are pre-programmed into the game software.
Casino one armed bandits have Random Number Generators that are endlessly generating combinations, even when the game is not being played.
Running side by side with the Random Number Generator of the casino slot machine is the payout percent.
The pay out percent controls just how much the slot machine will payout, for example the payout % might be ninety percent, which means the one arm bandit will pay out ninety percent of all the wagers played, … the casino only gets to keep 10 percent.
This does not mean that every time you bet 10 credits you will receive nine in return – where is the fun … exhilaration in that? Instead, the casino slot won’t pay out for a while, and then suddenly fire up a hot streak and you might catch the big jackpot prize.
The payoff %s most likely will vary between the various games and just a few of the notably famous casinos, e.g. Golden Online Casino, which provides a payout of up to 95 percentage!
So, in essence, the slot machine takes all the $$$$$ played into it and pays it out to a couple of lucky winners. The casino only gets to keep a fairly indistinct percentage of all the plays made.
The casino slot software controls any part of the machine, from the flashing lights to the revolving of the reels.
When you hit spin on the slot machine, a combination is generated by the RNG which associates with the pictures on the reel.