Modern casino Slots are controlled by a computer, and the win %s are preprogrammed into the computer software.
Casino slot games have Random Number Generators which are constantly generating combinations, even when the machine is not currently being played.
Running side by side with the RNG of the casino slot machine is the pay out rate percent.
The payout percent controls just how much the one-armed bandit will pay, for e.g. the payout percentage might be 90%, meaning the slot machine will pay ninety percent of all the bets played, and the casino gets to keep ten per cent.
This does not mean that for every time you bet 10 credits you will receive nine in return – where’s the fun and exhilaration in that? Instead, the casino slot just will not pay out for a little while, and then suddenly go on a hot streak and you might hit a big jackpot.
The pay out %s will tend to vary between the different games and some of the notably established casinos, for e.g Golden Online Casino, which gives a payout of up to ninety-five percentage!
Hence, in essence, the slot machine takes all the cash played into it and pays it out to a handful of lucky winners. The casino only gets to keep a considerably small percentage of all the plays placed.
The casino slot machine software controls each part of the machine, from the flickering lights to the rolling 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.