Modern casino slot machine games are controlled by a computer, and the winning %s are pre-programmed into the game software.
Casino slot machines have Random Number Generators which are continually generating combos, even when the game is not currently being played.
Running side by side with the Random Number Generator of the casino slot machine game is the payout percentage.
The pay out % controls how much the slot machine will payout, for eg the payout per cent may be ninety per cent, which means the slot machine will pay out ninety per cent of all the bets played, and the casino gets to keep 10%.
This does not imply that each time you bet ten credits you will receive 9 in return – where is the fun and exhilaration in that? Instead, the casino slot just will not payout for a little while, and then suddenly fire up a hot streak and you might catch the big top prize.
The pay out percentages most likely will vary between the a variety of games and a few of the highly popular casinos, e.g. Golden Online Casino, which gives a pay out of up to ninety five percent!
Therefore, in essence, the one-armed bandit takes all the funds played into it and pays it out to a couple of privileged winners. The casino only gets to keep a relatively tiny percentage of all the bets placed.
The casino slot machine software controls every single part of the machine, from the flickering lights to the circulating of the reels.
When you hit spin on the slot machine, a combination is formed by the RNG which corresponds to the pictures on the reel.