Modern casino slot machine games are controlled by computer chips and software, and the winning percentages are preprogrammed into the software.
Casino slot games have Random # Generators that are continuously generating combos, even when the slot machine is not being played.
Running in unison with the Random Number Generator of the casino slot machine game is the pay out rate %.
The pay out per cent controls how much the slot machine game will payout, for e.g. the pay out percentage may be 90%, meaning the slot game will pay 90% of all the stakes played, and the casino will then get to keep ten per cent.
This does not mean that each time you bet ten credits you will receive 9 in return – where is the fun and exhilaration in that? Instead, the casino slot machine game just will not payout for a little while, and then suddenly start up a hot streak and you might draw the big jackpot.
The pay off %s will very likely vary between the assorted games and some of the highly popular casinos, e.g. Golden Online Casino, which puts forth a pay out of up to ninety-five per cent!
As a result, in essence, the slot machine takes all the $$$$$ played into it and pays it out to a number of privileged winners. The casino only gets to keep a relatively indistinct per cent of all the gambles allocated.
The casino one armed bandit software controls any part of the machine, from the flashing lights to the spinning of the reels.
When you hit spin on the slot machine, a combination is produced by the RNG which connects with the pictures on the reel.