Modern casino one armed bandits are controlled by computer chips and software, and the win %s are pre-programmed into the computer software.
Casino slot games have RNGs which are constantly generating combinations, even when the machine is not currently being played.
Running in unison with the random # generator of the casino slot machine is the payout percentage.
The pay out percentage controls how much the slot machine will pay out, for eg the pay percent may be ninety per cent, meaning the slot machine game will pay 90% of all the stakes played, and the casino will then get to keep ten per cent.
This is not to say that for every time you bet 10 credits you will receive nine in return – where’s the fun … excitement in that? Instead, the casino slot just will not payout for a little while, and then suddenly hit a hot streak and you might hit a big grand prize.
The payout percentages will very likely vary between the assorted games and a couple of the notably popular casinos, e.g. Golden Online Casino, which gives a pay out of up to ninety-five %!
This means that, in essence, the slot machine game takes all the money played into it and pays it out to a few privileged winners. The casino only gets to keep a relatively indistinct % of all the stakes made.
The casino slot machine software controls every part of the machine, from the flickering lights to the circulating of the reels.
When you hit spin on the one-armed bandit, a combination is formed by the RNG which connects with the pictures on the reel.