Modern casino one armed bandits are controlled by computer chips and software, and the win percentages are pre-programmed into the game software.
Casino slot machines have RNGs which are continuously generating combinations, even when the slot machine is not currently being played.
Running side by side with the Random Number Generator of the casino slot machine game is the pay out %.
The pay out percent controls how much the one-armed bandit will payout, for example the payout per cent may be 90%, which means the one arm bandit will payout 90% of all the bets played, and the casino simply gets to keep 10 percent.
This doesn’t mean that each and every time you bet ten credits you will receive 9 in return – where’s the fun … exhilaration in that? Instead, the casino one arm bandit will not payout for a little while, and then suddenly start up a hot streak and you might draw the big top prize.
The pay off %s most likely will vary between the differing games and a few of the most popular casinos, for e.g Golden Online Casino, which gives a pay out of up to ninety five per cent!
So, in essence, the slot machine takes all the money played into it and pays it out to a few privileged winners. The casino only gets to keep a generally low percent of all the wagers made.
The casino slot software controls each and every part of the machine, from the flickering lights to the turning of the reels.
When you hit spin on the slot machine game, a combination is put together by the RNG which associates with the pictures on the reel.