Modern casino one armed bandits are controlled by computer software, and the winning %s are preprogrammed into the computer software.
Casino Slots have Random Number Generators which are continuously generating combos, even when the slot machine game is not currently being played.
Running in sync with the Random Number Generator of the casino one-armed bandit is the payout rate percent.
The payout percent controls just how much the one-armed bandit will pay, for example the payout percent could be ninety percent, meaning the slot machine game will pay ninety percent of all the stakes played, and the casino gets to keep 10%.
This is not to say that for every time you bet 10 credits you will receive nine in return – where is the fun and excitement in that? Instead, the casino one arm bandit will not payout for a bit, and then suddenly go on a hot streak and you might draw the big grand prize.
The pay out %s will most likely vary between the different games and a few of the most popular casinos, for e.g Golden Online Casino, which provides a pay out rate of up to ninety five percent!
So, in essence, the slot machine takes all the funds played into it and pays it out to several fortunate winners. The casino only gets to keep a averagely small percent of all the gambles allotted.
The casino slot software controls any part of the machine, from the flashing lights to the rotating of the reels.
When you hit spin on the one-armed bandit, a combination is produced by the RNG which is linked to the pictures on the reel.