Modern casino Slots are controlled by a computer, and the winning percentages are preprogrammed into the game software.
Casino Slots have RNGs which are constantly generating combos, even when the game is not being played.
Running concurrently with the random # generator of the casino slot machine game is the pay out percentage.
The pay out % controls how much the one-armed bandit will payout, for eg the pay percent may be 90%, meaning the slot machine game will pay ninety per cent of all the stakes played, … the casino only gets to keep 10 percent.
This does not mean that each time you bet ten credits you will receive nine in return – where is the fun and excitement in that? Instead, the casino slot machine game just won’t pay out for a while, and then suddenly jump on a hot streak and you might catch the big jackpot prize.
The payoff %s will vary between the assorted games and several of the highly popular casinos, e.g. Golden Online Casino, which provides a pay out rate of up to 95 per cent!
So, in essence, the one-armed bandit takes all the currency played into it and pays it out to a couple of privileged winners. The casino only gets to keep a fairly low percent of all the plays put out.
The casino slot software controls each and every part of the machine, from the flashing lights to the rolling of the reels.
When you hit spin on the one-armed bandit, a combination is generated by the RNG which associates with the pictures on the reel.