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The RNG
Nowadays slot machines are computerized. The odds are programmed. In modern slot machines, the reels and lever exist only for historical and entertainment reasons. The positions of the reels depend on a Random Number Generator. There is a Random Number Generator in the machine's software.
The RNG generates random numbers at an extremely high rate. As soon as the Play button is pressed, the most recent random number is used to determine the result. This means that the result varies depending on exactly when the game is played. The result would be different a fraction of a second earlier or later.
It was noticed that the RNG does not actually generate random numbers. Indeed, most RNGs will eventually repeat their number sequence. The cause of it is in poor programming. It is relatively easy to build pseudo RNGs with very long periods. The computer that is able to complete a single period in the expected lifetime of the universe hasn't been invented yet. Ronald Dale Harris, a former slot machine programmer, had access to the pseudo RNG code and seed values. Equations for specific gambling games like Keno were discovered by him. Thanks to them the fact that the next set of selected numbers would be based on the previous games became known. But it is impossible for most machines, because numbers are picked by the RNG even when no one plays. So the numbers can't be exactly found in a sequence.
Payout Percentage
Slot machines usually pay out as winnings 82–98 per cent of the money that is wagered by players. This payout percentage is called theoretical. The minimum theoretical payout percentage varies among jurisdictions. It is typically established by law or regulation. Nearly each casino has its own winning pattern. It contains the information about the amounts they pay and the frequencies of these pay-outs. The selection of the slot machines winning patterns is chosen in such a way that it could yield a certain fraction of the money played to the house. The rest of the money is given back to the players.
A slot machine's theoretical payout percentage is set at the factory when the software is written. Changing the payout percentage requires a physical swap of the software. It is done infrequently because this is a time-consuming process. In certain jurisdictions the EPROM has a tamper-evident seal. To change it Gaming Control Board officials should be present. Other jurisdictions constantly ensure that slot machines contain only approved software.
The Nevada Gaming Commission is working now with Las Vegas casinos on technology that would allow the casino's slot manager to change the game, the odds, and the payouts remotely. Only after the selected machine has been idle for at least four minutes can the change be done. The machine must be locked to new players for four minutes and display an on-screen message informing potential players that a change is being made after the change is made.
Linked Machines
Offering of a particularly large prize, or jackpot becomes possible when a group of machines is linked in a special way. If a player gets a specific combination of symbols the progressive jackpot from this group of machines is given to him. The amount paid for the progressive jackpot is usually far higher than any single slot machine could pay on its own.
Sometimes multiple machines form multiple casinos. The machines are then owned by the manufacturer, who is responsible for paying the jackpot.
Near-miss Programming
The reel display of modern slot machines is under computer software's control. That is why the slot machine can be programmed to display combinations that are close to winning combinations.
The term near-miss programming is used to denote this practice.
There is a related phenomenon that is also sometimes called near-miss. The chance of a winning combination appearing on a pay line is controlled by the winning percentages programmed into the slot machine. The combinations above and below the payline are all roughly equally randomly distributed. This means it is much more likely that a winning combination will appear above or below a pay line than on the pay line. The occurance of this phenomenon is possible when abbreviated physical reels are used to display a win pattern based upon the RNG. The symbols that appear around the winning line in video slots are an accurate depiction of how the reels were mathematically modeled.
The issue of a near-miss above or below the pay line was also investigated by the Nevada Gaming Commission. If the near-miss above or below the pay line was not specially programmed it was stated to be legal. In other words, any other combination must be just as likely to occur as the near-miss. It is impossible to program the machine to show winning combinations more frequently than other combinations above or below the pay line.
In Australia the usage of near-miss programming, where a near miss is inaccurately displayed is also illegal. Stop motion cameras are used by regulators for manufacturer's practices audit.
Slot Machines Fraud
Sometimes mechanical slot machines and their coin acceptors seem to belong to cheating devices and other scams.
Coin acceptors have become obsolete in favor of bill acceptors and modern slot machines are controlled by EPROM computer chips. They are designed with advanced anti-cheating and anti-counterfeiting measures and are difficult to defraud. Nowadays microwaves are used to defraud slot machines.
It is very easy to play slots. With slots you can win a lot of money. The main element of all slots is RNG, which determines the outcome. RNG is a Random Number Generator. RNG is a microchip, which is constantly churning out thousands of numbers a second. Even if nobody plays RNG works. When you hit a spin the machine takes the next number out which it then translates into the position which the reels should stop at, and whether you have won or not! Decide how much money or coins you can spend for one go and only then begin to play. If you can afford it make maximum bets. If you make maximum bets you have an opportunity to get the maximum win, which for some slots is the Progressive Jackpot. The payout depends on the type of a slot machine.
The first gambling machine, on which all modern slots are based, was invented by Charles Fey in 1887. Instead of symbols we have now there were regular playing card symbols. The gambling machine consisted of three mechanical reels and a lever. The lever had to be pulled to make the reels move. It was Charles Fey who offered the first slot machine to the public. The first slot consisted of three mechanically spinning reels. Every reel had ten sections with different pictures on them. The player won if three equal cards came out. In 1889 there appeared slots, which gave an opportunity to win the jackpot. Fey’s first slot machine was called the Liberty Bell. The slots were used as an entertainment mostly for ladies. Women played slots while their men gambled. There was a period of time when any kind of gambling was forbidden. There appeared so-called “Liberty Bell Gum Fruit” slots. “Liberty Bell Gum Fruit” sold chewing gums and in addition to it people could make a spin and win. Pictures of different fruits were used as the symbols. At the end of the 20th century computerized slots and video poker machines appeared. Modern slots are much easier to use. Gamblers push the button and the game starts. Now playing slots through Internet is available for players from all over the world.
All slots work according to one and the same rule. You put coins or money in the slot machine and then pull the handle. According to the main slot classification there are two types of slots. They are straight slots and progressive slots. The main feature, which distinguishes straight slots from other types is that you get paid according to the payout table, which is shown on the slot machine. Inside the straight slot group four more types are distinguished. They are multiplier, bonus multiplier, multiple payline and buy-a-pay slots. The main feature of multiplier slots is that the payout for a winning combination depends on the number of coins bet. The Bonus Multiplier game offers a bonus if you make maximum bets. When playing multiple payline slots remember that the number of coins being bet determines the winning amount. The Buy-a-Pay slots are profitable only if you place maximum bets. The jackpot for Progressive slots is never the same as it grows higher with every coin put in the machine. The jackpot for Progressive slots is always displayed on the top of the machine.
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