Sittman and Pitt of Brooklyn, New York developed a gambling machine in 1891 that could be considered a precursor to the modern slot machine. It contained 5 drums holding a total of 50 card faces and was based on poker. This machine proved extremely popular and soon there was hardly a bar in the city that didn't have one or more of the machines bar-side. Players would insert a nickel and pull a lever, which would spin the drums and the cards they held, the player hoping for a good poker hand.
There was no direct payout mechanism, so a pair of Kings might get the player a free beer, whereas a Royal Flush could pay out cigars or drinks, the prizes wholly dependent on what was on offer at the local establishment. To make the odds better for the house, two cards were typically removed from the "deck": the Ten of Spades and the Jack of Hearts, which cut the odds of winning a Royal Flush by half. The drums could also be re-arranged to further reduce a player's chance of winning. The first "one-armed bandit" was invented in 1887 by Charles Fey of San Francisco, California, who devised a much simpler automatic mechanism. Due to the vast number of possible wins with the original poker card-based game, it proved practically impossible to come up with a way to make a machine capable of making an automatic pay-out for all possible winning combinations. Charles Fey devised a machine with three spinning reels containing a total of five symbols – horseshoes, diamonds, spades, hearts and a Liberty Bell, which also gave the machine its name By replacing ten cards with five symbols and using three reels instead of five drums, the complexity of reading a win was considerably reduced, allowing Fey to devise an effective automatic payout mechanism. Three bells in a row produced the biggest payoff, ten nickels. Liberty Bell was a huge success and spawned a thriving mechanical gaming device industry. Even when the use of these gambling devices was banned in his home State after a few years, Fey still couldn't keep up with demand for the game elsewhere. Another early machine gave out winnings in the form of fruit flavoured chewing gums with pictures of the flavours as symbols on the reels. The popular cherry and melon symbols derive from this machine. The "BAR" symbol now common in slot machines was derived from an early logo of the Bell-Fruit Gum Company. In 1964, Bally developed the first fully electromechanical slot machine called Money Honey.
A row of "Wheel of Fortune" slot machines in a casino in Las Vegas. This specific slot machine is loosely based on the TV game show Wheel of FortuneA person playing a slot machine purchases the right to play by inserting coins, cash, or in newer machines, a bar-coded paper ticket (known as "ticket in/ticket out" machines), into a designated slot on the machine. The machine is then activated by means of a lever or button, or on newer machines, by pressing a touchscreen on its face. The game itself may or may not involve skill on the player's part — or it may create the illusion of involving skill without actually being anything else than a game of chance. The object of the game is to win money from the machine. The game usually involves matching symbols, either on mechanical reels that spin and stop to reveal one or several symbols, or on a video screen. The symbols are usually brightly colored and easily recognizable, such as images of fruits, and simple shapes such as bells, diamonds, or hearts. Most games have a variety of winning combinations of symbols, often posted on the face of the machine. If a player matches a combination according to the rules of the game, the slot machine pays the player cash or some other sort of value, such as extra games. There are many different kinds of gambling slot machines in places such as Las Vegas. Some of the most popular are the video poker machines, in which players hope to obtain a set of symbols corresponding to a winning poker hand. There are standard 5-card draw machines, all the way up to 100-play machines, where you can play 100 hands at a time. Becoming more popular now are the 9 line slots. Usually these are themed slots, with graphics and music based on popular entertainers or TV programs (The Addams Family, I Dream of Jeannie, etc.) with a bonus round. Most accept variable amounts of credit to play with 1 to 5 credits per line being typical. The higher the amount bet, the higher the payout will be. An extensive, yet far incomplete list of video slot machines follows: Barnyard Rock, Bayou Bucks, Beetle Bailey, Bikini Bay, Black & White Double Jackpot, Blazing, Bonus Seven’s, Bunch O’ Luck, Cash Corral, Cash Cow, Cave Age Cash, Cherry Penny Jackpot, Cherry Pop, Claim Jumper, Classic Mixed Fruit Magic, Cleopatra Cock-A-Doodle Dough Cool Catz Crazy Bill’s Gold Strike Crazy Cherry Crazy Vegas Crown Jewels Diamond Fever Dolphin Treasure Double Cash Money Double Double Bonus Poker Double Jackpot Double Money Draw Poker Ed McMahon’s Star Magic Emperor Enchanted Unicorn Fantasy Respin Five Play Multi-Strike Poker 5 Wishes Flash Cash Bingo Game King Multi-Game Poker Gems & Jewels Gold’n Glory Gold Rush Grand Ave. Grave Yard Bash Hexbreaker High Stakes Stud Poker High Voltage Bonus Hot 7’s Hundred Play Draw Poker I Dream of Jeannie Jackpot Party Jacks or Better Joker Poker Jungle Juice Keystone Kopper’s Krazee Payouts Kwikeno Krazy Farm Last Resort Leprechaun’s Gold Liberty 7’s Lightning Double Strike Little Green Men Lucky Ducky Lucky Leprechaun’s Loot Lucky Times at RICHMONT High Lusty Dusty Major Bucks Major Money Mama’s Millions Megamania Meltdown Monster Mansion Money to Burn Moon Struck Mr. Moneybags and many more... Recently, some casinos have chosen to take advantage of a concept commonly known as "tokenization": 1 token buys more than one credit. A casino can configure slot machines of numerous different denominations to accept the same type of token. (For example, all penny, nickel, quarter, and dollar slot machines could be configured to accept dollar tokens.) This significantly reduces a casino's inventory costs and coin handling costs. A tokenized slot machine automatically calculates the number of credits the player receives in exchange for the token inserted and displays the amount of available credits to the player. When a player chooses to collect his credits (by pressing a "Cash Out" button), the slot machine will automatically divide the number of credits on the credit meter by the value of one token and return the result to the patron. Any remainder is known as "residual credits" and cannot be collected. Residual credits must be either played or abandoned.
It is a common belief that the odds on a machine have something to do with the number of each kind of symbol on each reel, but in modern slot machines this is no longer the case. Modern slot machines are computerized, so that the odds are whatever they are programmed to be. In modern slot machines, the reels and lever are present for historical and entertainment reasons only. The positions the reels will come to rest on are chosen by a Random Number Generator (RNG) contained in the machine's software. This is called "virtual reel" technology. The RNG is constantly generating random numbers, at a rate of thousands to millions per second. As soon as the lever is pulled or 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.
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