Modern casino slot machines are controlled by computer software, and the win percentages are pre-programmed into the software.
Casino slot machine games have Random Number Generators that are eternally generating combinations, even when the slot machine is not active.
Running in unison with the Random Number Generator of the casino slot machine is the payout rate percentage.
The pay out percent controls how much the slot machine game will pay, for example the payout per cent could be ninety per cent, which means the slot game will pay ninety percent of all the bets played, … the casino gets to keep ten per cent.
This does not mean that for every time you bet 10 credits you will receive 9 in return – where is the fun and exhilaration in that? Instead, the casino slot machine just will not pay out for a bit, and then suddenly jump on a hot streak and you might catch the big jackpot.
The pay out %s will most likely vary between the alternate games and some of the highly popular casinos, for e.g Golden Online Casino, which puts forth a pay out of up to ninety five percentage!
Thus, in essence, the one-armed bandit takes all the funds played into it and pays it out to a number of privileged winners. The casino only gets to keep a generally indistinct % of all the stakes made.
The casino slot software controls every part of the machine, from the flickering lights to the turning of the reels.
When you hit spin on the one-armed bandit, a combination is formed by the RNG which corresponds to the pictures on the reel.