Modern casino slot machine games are controlled by computer chips and software, and the winning %s are preprogrammed into the software.
Casino slot machines have RNGs which are continually generating combos, even when the slot machine is not being played.
Running in unison with the random # generator of the casino one-armed bandit is the pay out percentage.
The pay out percentage controls just how much the one-armed bandit will pay out, for example the pay out percentage could be ninety percent, meaning the one arm bandit will pay out ninety percent of all the stakes played, and the casino gets to keep 10 per cent.
This does not mean that each time you bet ten credits you will receive 9 in return – where is the fun and excitement in that? Instead, the casino slot machine game will not payout for a while, and then suddenly hit a hot streak and you might hit a big top prize.
The pay off percentages usually will vary between the a variety of games and just a few of the highly established casinos, for e.g Golden Online Casino, which tenders a pay out of up to 95 percentage!
So, in essence, the one-armed bandit takes all the dough played into it and pays it out to a number of lucky winners. The casino only gets to keep a relatively low percent of all the bets allotted.
The casino slot machine 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 slot machine game, a combination is set up by the RNG which is linked to the pictures on the reel.