Modern casino slot games are controlled by computer chips and software, and the win %s are preprogrammed into the computer software.
Casino one armed bandits have Random # Generators that are continually generating combos, even when the game is not being played.
Running concurrently with the random # generator of the casino one-armed bandit is the payout rate percentage.
The pay out % controls just how much the slot machine will pay, for e.g. the pay percentage could be 90%, which means the slot game will payout ninety per cent of all the bets played, and the casino only gets to keep ten percent.
This does not mean that each time you bet 10 credits you will receive 9 in return – where is the fun … excitement 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 catch the big grand prize.
The pay off percentages will tend to vary between the alternate games and a handful of the notably popular casinos, e.g. Golden Online Casino, which tenders a payment of up to 95 percentage!
Thus, in essence, the slot machine game takes all the money played into it and pays it out to a handful of fortunate winners. The casino only gets to keep a fairly small percentage of all the odds made.
The casino slot machine software controls any part of the machine, from the flickering lights to the rotating of the reels.
When you hit spin on the one-armed bandit, a combination is formed by the RNG which associates with the pictures on the reel.