Modern casino slot machines are controlled by computer chips and software, and the winning %s are pre-programmed into the software.
Casino Slots have RNGs which are endlessly generating combinations, even when the slot machine is not being played.
Running synchronously with the Random Number Generator of the casino one-armed bandit is the pay out percentage.
The payout percent controls just how much the one-armed bandit will payout, for eg the pay out per cent may be ninety percent, which means the slot machine game will pay out ninety percent of all the stakes 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 9 in return – where’s the fun … thrill in that? Instead, the casino slot machine game won’t payout for a little while, and then suddenly fire up a hot streak and you might catch the big grand prize.
The payoff percentages will very likely vary between the alternate games and a couple of the highly acclaimed casinos, e.g. Golden Online Casino, which offers a payout rate of up to 95 %!
Therefore, in essence, the slot machine takes all the cash played into it and pays it out to some chosen winners. The casino only gets to keep a relatively tiny percentage of all the plays allocated.
The casino slot software controls every part of the machine, from the flickering lights to the spinning 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.