Modern casino one armed bandits are controlled by computer software, and the win %s are pre-programmed into the software.
Casino slot machines have Random Number Generators that are continually generating combinations, even when the slot machine is not currently being played.
Running synchronously with the Random Number Generator of the casino one-armed bandit is the pay out rate percentage.
The pay out percentage controls how much the one-armed bandit will payout, for e.g. the pay out percentage might be ninety percent, meaning the slot game will pay out ninety per cent of all the wagers played, and the casino simply gets to keep 10 percent.
This doesn’t mean that each 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 payout for a bit, and then suddenly fire up a hot streak and you might draw the big grand prize.
The payout %s will definitely vary between the different games and a couple of the notably common casinos, e.g. Golden Online Casino, which offers a cash payment of up to 95 percentage!
Thus, in essence, the slot machine game takes all the cash played into it and pays it out to a handful of privileged winners. The casino only gets to keep a fairly indistinct percentage of all the odds put out.
The casino slot software controls any part of the machine, from the flashing lights to the revolving of the reels.
When you hit spin on the one-armed bandit, a combination is set up by the RNG which is linked to the pictures on the reel.