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Electronic slot machines

electronic slot machines

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This electronic casino slot machine is in excellent condition for its age. Perfect gift for your friends or children.

Use any loose change laying around as your slot tokens, comes with a working light Use any loose change laying around as your slot tokens.

Working light and bell for when you get the jackpot. Fan Fan, Dick Tracy. Fan Fan Slot Machine. The outcome of each pull is actually controlled by a central computer inside the machine, not by the motion of the reels.

The computer uses step motors to turn each reel and stop it at the predetermined point. Step motors are driven by short digital pulses of electricity controlled by the computer, rather than the fluctuating electrical current that drives an ordinary electric motor.

These pulses move the motor a set increment, or step, with great precision see Introduction To Step Motor Systems to find out more. But even though the computer tells the reels where to stop, the games are not pre-programmed to pay out at a certain time.

A random number generator at the heart of the computer ensures that each pull has an equal shot at hitting the jackpot.

Whenever the slot machine is turned on, the random number generator is spitting out whole numbers typically between 1 and several billion hundreds of times a second.

The instant you pull the arm back or press the button , the computer records the next few numbers from the random number generator. Then it feeds these numbers through a simple program to determine where the reels should stop.

Computer systems have made slot machines a lot more adaptable. For example, players can now bet money straight from a credit account, rather than dropping coins in for every pull.

Or, they can appear only during the bonus rounds. The player must refer to the rules and paytable of the game to learn about the landing rules. Mobile is when the slot machine is hosted for online gambling and it is usually available for use on a phone, tablet, or other portable device.

These are often standalone mobile casino applications but are also found as part of the online casino site. By , HTML5 technology and the advancement of mobile browsers had negated the need for standalone mobile apps.

New slots are, by majority, playable on both mobile and desktop devices. Each machine has a table that lists the number of credits the player will receive if the symbols listed on the pay table line up on the pay line of the machine.

Some symbols are wild and can represent many, or all, of the other symbols to complete a winning line. Especially on older machines, the pay table is listed on the face of the machine, usually above and below the area containing the wheels.

Most video machines display the pay table when the player presses a "pay table" button or touches "pay table" on the screen; some have the pay table listed on the cabinet as well.

Historically, all slot machines used revolving mechanical reels to display and determine results. Although the original slot machine used five reels, simpler, and therefore more reliable, three reel machines quickly became the standard.

This limited the manufacturer's ability to offer large jackpots since even the rarest event had a likelihood of 0. Although the number of symbols eventually increased to about 22, allowing 10, combinations, [21] this still limited jackpot sizes as well as the number of possible outcomes.

In the s, however, slot machine manufacturers incorporated electronics into their products and programmed them to weight particular symbols.

Thus the odds of losing symbols appearing on the payline became disproportionate to their actual frequency on the physical reel.

A symbol would only appear once on the reel displayed to the player, but could, in fact, occupy several stops on the multiple reel. With microprocessors now ubiquitous, the computers inside modern slot machines allow manufacturers to assign a different probability to every symbol on every reel.

To the player it might appear that a winning symbol was 'so close', whereas in fact the probability is much lower.

In the s in the UK machines embodying microprocessors became common. These used a number of features to ensure the payout was controlled within the limits of the gambling legislation.

As the coin was inserted into the machine it could go one of two routes, either direct into the cashbox for the benefit of the owner, or alternatively it would go into a channel that formed the payout reservoir, the microprocessor monitoring the number of coins in this channel.

The drums themselves were driven by stepper motors, controlled by the processor and with proximity sensors monitoring the position of the drums.

A "look up table" within the software allows the processor to know what symbols were being displayed on the drums to the gambler.

This allowed the system to control the level of payout by stopping the drums at positions it had determined. If the payout channel had filled up, the payout became more generous, if nearly empty, less so thus giving good control of the odds.

The video slot machine is a more recent innovation, with no moving parts at all — instead a graphical representation of one appears on screen.

In addition, because there are no mechanical constraints on the design of video slot machines, most display five reels rather than three. This greatly expands the number of possibilities: As there are so many combinations given by five reels, the manufacturers do not need to weight the payout symbols although some may still do so.

Instead, higher paying symbols will typically appear only once or twice on each reel, while more common symbols, earning a more frequent payout, will appear many times.

Video slot machines typically encourage the player to play multiple "lines", so rather than simply taking the middle of the three symbols displayed on each reel, a line could go from top left to bottom right, or any of the other patterns specified by the manufacturer.

As each symbol is equally likely, there is no difficulty for the manufacturer in allowing the player to take any or all of the possible lines on offer — the long-term return to player will be the same.

The difference for the player is that the more lines he plays the more likely he is to get paid on a given spin — though of course he is betting more in the first place.

To avoid the feeling that the player's money is simply ebbing away whereas a payout of credits on a single line machine would be bets, and the player would feel they had made a substantial win, on a 20 line machine, it would only be 5 bets and would not seem significant , manufacturers commonly offer bonus games, which can return many times their bet.

The player is encouraged to keep playing to reach the bonus: All modern machines are designed using pseudo random number generators "PRNGs" , which are constantly generating a sequence of simulated random numbers, at a rate of hundreds or perhaps thousands per second.

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.

A fraction of a second earlier or later, and the result would be different. It is important that the machine contains a high-quality RNG implementation, because all PRNGs must eventually repeat their number sequence, [24] and if the period is short, or the PRNG is otherwise flawed, an advanced player may be able to 'predict' the next result.

Having access to the PRNG code and seed values, Ronald Dale Harris , a former slot machine programmer, discovered equations for specific gambling games like Keno that allowed him to predict what the next set of selected numbers would be based on the previous games played.

Most machines are designed to defeat this by generating numbers even when the machine is not being played, so the player cannot tell where in the sequence they are, even if they know how the machine was programmed.

This is known as the "theoretical payout percentage" or RTP, "return to player". The minimum theoretical payout percentage varies among jurisdictions and is typically established by law or regulation.

The winning patterns on slot machines — the amounts they pay and the frequencies of those payouts — are carefully selected to yield a certain fraction of the money played to the "house" the operator of the slot machine , while returning the rest to the players during play.

Within some EGM development organizations this concept is referred to simply as "par. A slot machine's theoretical payout percentage is set at the factory when the software is written.

Changing the payout percentage after a slot machine has been placed on the gaming floor requires a physical swap of the software or firmware , which is usually stored on an EPROM but may be loaded onto non-volatile random access memory NVRAM or even stored on CD-ROM or DVD , depending on the capabilities of the machine and the applicable regulations.

Based on current technology, this is a time-consuming process and as such is done infrequently. Other jurisdictions, including Nevada, randomly audit slot machines to ensure that they contain only approved software.

Historically, many casinos, both online and offline, have been unwilling to publish individual game RTP figures, making it impossible for the player to know whether they are playing a "loose" or a "tight" game.

Since the turn of the century some information regarding these figures has started to come into the public domain either through various casinos releasing them—primarily this applies to online casinos—or through studies by independent gambling authorities.

The return to player is not the only statistic that is of interest. The probabilities of every payout on the pay table is also critical.

For example, consider a hypothetical slot machine with a dozen different values on the pay table. However, the probabilities of getting all the payouts are zero except the largest one.

Also, most people would not win anything, and having entries on the paytable that have a return of zero would be deceptive.

As these individual probabilities are closely guarded secrets, it is possible that the advertised machines with high return to player simply increase the probabilities of these jackpots.

The added advantage is that these large jackpots increase the excitement of the other players.

This game, in its original form, is obsolete, so these specific probabilities do not apply. He only published the odds after a fan of his sent him some information provided on a slot machine that was posted on a machine in the Netherlands.

The psychology of the machine design is quickly revealed. There are 13 possible payouts ranging from 1: Most players assume the likelihood increases proportionate to the payout.

The one midsize payout that is designed to give the player a thrill is the It is programmed to occur an average of once every plays.

In contrast the The highest payout of 2, The player who continues to feed the machine is likely to have several midsize payouts, but unlikely to have a large payout.

He quits after he is bored or has exhausted his bankroll. Despite the fact that they are confidential, occasionally a PAR sheet is posted on a website.

They have limited value to the player, because usually a machine will have 8 to 12 different possible programs with varying payouts.

In addition, slight variations of each machine e. The casino operator can choose which EPROM chip to install in any particular machine to select the payout desired.

The result is that there is not really such a thing as a high payback type of machine, since every machine potentially has multiple settings.

Without revealing the proprietary information, he developed a program that would allow him to determine with usually less than a dozen plays on each machine which EPROM chip was installed.

Then he did a survey of over machines in 70 different casinos in Las Vegas. He averaged the data, and assigned an average payback percentage to the machines in each casino.

The resultant list was widely publicized for marketing purposes especially by the Palms casino which had the top ranking.

One reason that the slot machine is so profitable to a casino is that the player must play the high house edge and high payout wagers along with the low house edge and low payout wagers.

Other bets have a higher house edge, but the player is rewarded with a bigger win up to thirty times in craps.

The player can choose what kind of wager he wants to make. A slot machine does not afford such an opportunity. Theoretically, the operator could make these probabilities available, or allow the player to choose which one so that the player is free to make a choice.

However, no operator has ever enacted this strategy. Different machines have different maximum payouts, but without knowing the odds of getting the jackpot, there is no rational way to differentiate.

In many markets where central monitoring and control systems are used to link machines for auditing and security purposes, usually in wide area networks of multiple venues and thousands of machines, player return must usually be changed from a central computer rather than at each machine.

A range of percentages is set in the game software and selected remotely. In , the Nevada Gaming Commission began working with Las Vegas casinos on technology that would allow the casino's management to change the game, the odds, and the payouts remotely.

The change cannot be done instantaneously, but only after the selected machine has been idle for at least four minutes. After the change is made, 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.

Often machines are linked together in a way that allows a group of machines to offer a particularly large prize, or "jackpot".

Each slot machine in the group contributes a small amount to this progressive jackpot , awarded to a player who gets, for example, a royal flush on a video poker machine or a specific combination of symbols on a regular or nine-line slot machine.

The amount paid for the progressive jackpot is usually far higher than any single slot machine could pay on its own.

In some cases multiple machines are linked across multiple casinos. In these cases, the machines may be owned by the manufacturer, who is responsible for paying the jackpot.

The casinos lease the machines rather than owning them outright. Casinos in New Jersey, Nevada, and South Dakota now offer multi-state progressive jackpots, which now offer bigger jackpot pools.

Mechanical slot machines and their coin acceptors were sometimes susceptible to cheating devices and other scams. One historical example involved spinning a coin with a short length of plastic wire.

The weight and size of the coin would be accepted by the machine and credits would be granted. However, the spin created by the plastic wire would cause the coin to exit through the reject chute into the payout tray.

This particular scam has become obsolete due to improvements in newer slot machines. Another obsolete method of defeating slot machines was to use a light source to confuse the optical sensor used to count coins during payout.

Modern slot machines are controlled by EPROM computer chips and, in large casinos, coin acceptors have become obsolete in favor of bill acceptors.

These machines and their bill acceptors are designed with advanced anti-cheating and anti-counterfeiting measures and are difficult to defraud.

Early computerized slot machines were sometimes defrauded through the use of cheating devices, such as the "slider" or "monkey paw".

Computerized slot machines are fully deterministic and thus outcomes can be sometimes successfully predicted.

Malfunctioning electronic slot machines are capable of indicating jackpot winnings far in excess of those advertised. In the United States, the public and private availability of slot machines is highly regulated by state governments.

Many states have established gaming control boards to regulate the possession and use of slot machines. Nevada is the only state that has no significant restrictions against slot machines both for public and private use.

In New Jersey , slot machines are only allowed in hotel casinos operated in Atlantic City. Several states Illinois , Indiana , Louisiana and Missouri allow slot machines as well as any casino-style gambling only on licensed riverboats or permanently anchored barges.

Since Hurricane Katrina , Mississippi has removed the requirement that casinos on the Gulf Coast operate on barges and now allows them on land along the shoreline.

Delaware allows slot machines at three horse tracks; they are regulated by the state lottery commission. In Wisconsin, bars and taverns are allowed to have up to five machines.

These machines usually allow a player to either take a payout, or gamble it on a double-or-nothing "side game".

A player redeems his winnings by pressing a button to print a ticket, which the bartender redeems for cash. The territory of Puerto Rico places significant restrictions on slot machine ownership, but the law is widely flouted and slot machines are common in bars and coffeeshops.

Conversely, in Connecticut , Hawaii , Nebraska , South Carolina , and Tennessee , private ownership of any slot machine is completely prohibited.

The remaining states allow slot machines of a certain age typically 25—30 years or slot machines manufactured before a specific date.

For a detailed list of state-by-state regulations on private slot machine ownership, see U. Native American casinos located in reservations are not permitted to have slot machines unless the tribe first reaches a pact with the state in which it is located per Indian Gaming Regulatory Act.

Typically, a pact entitles the state to receive a fraction of the gross revenue from slot machines. Some states have restrictions on the type called "class" of slot machines that can be used in a casino or other gaming area.

The Indian Gaming Regulatory Act establishes three classes of games with a different regulatory scheme for each: Class I gaming is defined as 1 traditional Indian gaming, which may be part of tribal ceremonies and celebrations, and 2 social gaming for minimal prizes.

Regulatory authority over class I gaming is vested exclusively in tribal governments and is not subject to IGRA's requirements.

Class II gaming is defined as the game of chance commonly known as bingo whether or not electronic, computer, or other technological aids are used in connection therewith and, if played in the same location as the bingo , pull tabs, punch board, tip jars, instant bingo, and other games similar to bingo.

Class II gaming also includes non-banked card games , that is, games that are played exclusively against other players rather than against the house or a player acting as a bank.

The Act specifically excludes slot machines or electronic facsimiles of any game of chance from the definition of class II games.

Tribes retain their authority to conduct, license, and regulate class II gaming, provided it complies with the Act - including the requirement that the Tribal government adopt a gaming ordinance approved by the National Indian Gaming Commission NIGC.

Tribal governments are the primary entity responsible for regulating class II gaming on its lands. Only Hawaii and Utah continue to prohibit all types of gaming.

The definition of class III gaming is broad. It includes all forms of gaming that are neither class I nor II. Games commonly played at casinos , such as slot machines , blackjack , craps , and roulette , clearly fall in the class III category, as well as wagering games and electronic facsimiles of any game of chance.

Generally, class III is often referred to as casino-style gaming. The regulatory scheme for class III gaming is more complex than a casual reading of the statute might suggest.

Although Congress clearly intended regulatory issues to be addressed in Tribal-State compacts , it left a number of key functions in federal hands, including approval authority over compacts, management contracts, and Tribal gaming ordinances.

Congress also vested the Commission with broad authority to issue regulations in furtherance of the purposes of the Act.

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