Modern casino slot machines are controlled by computer chips and software, and the win %s are pre-programmed into the computer software.
Casino slot machines have RNGs that are eternally generating combinations, even when the machine is not being played.
Running in sync with the Random Number Generator of the casino slot machine is the payout rate per cent.
The pay out per cent controls how much the slot machine will pay, for example the pay percentage may be 90%, which means the slot machine will pay out 90% of all the bets played, and the casino gets to keep ten per cent.
This really does not mean that for every time you bet 10 credits you will receive 9 in return – where is the fun … thrill in that? Instead, the casino slot just will not payout for a little while, and then suddenly jump on a hot streak and you might catch the big pot prize.
The profit %s will very likely vary between the differing games and a handful of the very popular casinos, e.g. Golden Online Casino, which provides a payment of up to 95 percent!
Therefore, in essence, the one-armed bandit takes all the funds played into it and pays it out to some chosen winners. The casino only gets to keep a fairly tiny % of all the bets allotted.
The casino slot machine software controls any part of the machine, from the dazzling lights to the spinning of the reels.
When you hit spin on the slot machine game, a combination is generated by the RNG which is linked to the pictures on the reel.