Modern casino slot machine games are controlled by computer chips and software, and the winner percentages are pre-programmed into the software.
Casino slot games have Random Number Generators which are continually generating combinations, even when the game is not active.
Running synchronously with the RNG of the casino one-armed bandit is the pay out %.
The pay out % controls just how much the one-armed bandit will pay, for e.g. the payout % could be ninety per cent, which means the slot machine will pay 90% of all the wagers played, and the casino only gets to keep ten per cent.
This does not mean that each time you bet 10 credits you will receive 9 in return – where is the fun and exhilaration in that? Instead, the casino one arm bandit just won’t payout for a bit, and then suddenly hit a hot streak and you might hit a big jackpot prize.
The payoff percentages will tend to vary between the differing games and a few of the notably famous casinos, for example Golden Online Casino, which gives a cash payment of up to ninety five percent!
Therefore, in essence, the slot machine game takes all the $$$$$ played into it and pays it out to a handful of fortunate winners. The casino only gets to keep a relatively indistinct % of all the bets allocated.
The casino slot software controls every single part of the machine, from the flashing lights to the rolling of the reels.
When you hit spin on the slot machine, a combination is formed by the RNG which associates with the pictures on the reel.