Modern casino slot machines are controlled by computer chips and software, and the winning percentages are pre-programmed into the gaming software.
Casino one armed bandits have Random Number Generators which are constantly generating combos, even when the game is not being played.
Running concurrently with the Random Number Generator of the casino one-armed bandit is the pay out rate percent.
The payout percentage controls how much the slot machine will payout, for e.g. the pay percentage could be 90%, meaning the slot machine will pay out ninety percent of all the bets played, and the casino only gets to keep 10 percent.
This is not to say that each time you bet 10 credits you will receive 9 in return – where is the fun and thrill in that? Instead, the casino slot machine just will not pay out for a little while, and then suddenly fire up a hot streak and you might draw the big grand prize.
The profit percentages usually will vary between the differing games and a handful of the very common casinos, like Golden Online Casino, which tenders a payout rate of up to ninety-five per cent!
Therefore, in essence, the slot machine takes all the $$$$$ played into it and pays it out to a few privileged winners. The casino only gets to keep a fairly petite % of all the wagers placed.
The casino slot software controls every single part of the machine, from the flickering lights to the rolling of the reels.
When you hit spin on the one-armed bandit, a combination is set up by the RNG which relates to the pictures on the reel.