Modern casino one armed bandits are controlled by computer software, and the win %s are pre-programmed into the game software.
Casino Slots have RNGs that are continually generating combos, even when the slot machine is not currently being played.
Running collectively with the random # generator of the casino one-armed bandit is the pay out percent.
The payout % controls how much the slot machine will payout, for eg the payout per cent could be ninety percent, meaning the slot game will pay ninety percent of all the wagers played, and the casino simply gets to keep 10 per cent.
This does not mean that every time you bet ten credits you will receive nine in return – where is the fun and exhilaration in that? Instead, the casino slot just will not payout for a while, and then suddenly go on a hot streak and you might hit a big pot prize.
The payoff percentages will tend to vary between the alternate games and a couple of the highly popular casinos, e.g. Golden Online Casino, which hands out a payout rate of up to 95 percentage!
Thus, in essence, the slot machine takes all the funds played into it and pays it out to a few fortunate winners. The casino only gets to keep a basically indistinct percentage of all the bets allotted.
The casino one armed bandit software controls any 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 formed by the RNG which is linked to the pictures on the reel.