Modern casino slot machines are controlled by computer chips and software, and the winning %s are preprogrammed into the gaming software.
Casino one armed bandits have Random Number Generators which are eternally generating combos, even when the slot machine is not being played.
Running concurrently with the RNG of the casino slot machine is the pay out rate %.
The pay out percentage controls just how much the one-armed bandit will payout, for e.g. the payout per cent could be ninety per cent, meaning the slot machine game will pay ninety percent of all the stakes played, and the casino only gets to keep 10 per cent.
This doesn’t mean that for every time you bet ten credits you will receive 9 in return – where’s the fun … excitement in that? Instead, the casino slot machine game just won’t pay out for a while, and then suddenly jump on a hot streak and you might catch the big pot prize.
The pay out %s will tend to vary between the various games and a few of the notably common casinos, for e.g Golden Online Casino, which tenders a payout of up to 95 per cent!
Therefore, in essence, the slot machine takes all the money played into it and pays it out to a couple of lucky winners. The casino only gets to keep a generally tiny % of all the plays allocated.
The casino slot software controls each and every part of the machine, from the flickering lights to the revolving of the reels.
When you hit spin on the slot machine game, a combination is put together by the RNG which is linked to the pictures on the reel.