Modern casino slot games are controlled by computer chips and software, and the win percentages are pre-programmed into the software.
Casino slot machine games have Random Number Generators that are ceaselessly generating combos, even when the slot machine game is not currently being played.
Running concurrently with the random # generator of the casino slot machine is the pay out rate %.
The pay out percent controls just how much the one-armed bandit will pay out, for e.g. the pay percent may be 90%, meaning the slot game will pay ninety percent of all the bets played, and the casino simply gets to keep 10%.
This doesn’t mean that for every time you bet 10 credits you will receive 9 in return – where’s the fun and thrill in that? Instead, the casino slot machine just won’t payout for a bit, and then suddenly go on a hot streak and you might hit a big pot prize.
The pay off percentages most likely will vary between the a variety of games and a few of the very common casinos, for example Golden Online Casino, which tenders a cash payment of up to ninety-five percent!
Therefore, in essence, the one-armed bandit takes all the currency played into it and pays it out to a few lucky winners. The casino only gets to keep a relatively small percent of all the wagers made.
The casino slot machine software controls each and every part of the machine, from the flashing lights to the spinning of the reels.
When you hit spin on the slot machine, a combination is developed by the RNG which is linked to the pictures on the reel.