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It only took a decade for slot machines to start generating twice as much revenue per year as all the table games put together. By 2003, gambling machines were generating 85% of the casinos’ revenues. You’ll often see 65% or 70% quoted on various websites, by the way. Nov 06, 2019 Despite the fact there are a lot of slot games, machines are relatively easy to use. Every slot machine has several key components. In this guide we are going to talk about the key slot machine components and how to use them.
No, the machine does not have a huge element table of over two billion elements. The random number generators choose each number once in the cycle using mathematical algorithms and do not need to keep track of which numbers were already chosen. Regarding the pause, it has nothing to do with how much it is going to pay. I think the game does some internal auditing from time to time. There is no such thing as hot and cold cycles with slot machines. The ups and downs are just normal random variation.
If the machine is truly picking random combinations wouldn't the prize distribution be more random. It's as if IGT programmed the machine to have 'Planned Cycles' to make the game more interesting to play. I know your going to say that these are just random events, but it is extremely unlikely that a machine will only pay mid and lower tier prizes all day and omit the jackpot and vice-versa and do this over and over again. HOW are these WEIGHTED cycles explained? Also if you could point me to any books you recommend on the programming of slot machines I would appreciate it.
These are just random events. The laws of probability dictate that some days will be dry with a few big winners and others will have a lot of lower payouts. Most days will have a balanced mix and these days are always the first forgotten by the player. There is no switch the casino is throwing to alter the mood of their machines. I tend to think you're just remember what you want to in order to substantiate your theory.
No, this does not happen. How much the slot machine pays is determined by a microchip called an EPROM, which is generally left alone. To change it, at least in Nevada, the casino would have to get permission from the gaming authorities. Even without permission, they would have to open up each machine and change the EPROM by hand.
I speculate that the reason for what you observed about all the machines on a carousel getting hot at the same time is due partially to chance, partially selective memory, and partially to a snowball effect where players will gravitate to an area where they hear a lot of winning and simply add to the number of wins because of more players.
- Given the random number generator stops on a virtual Cherry say, how does the machine make the physical reel stop on a visible cherry? I mean technically speaking.
- Does this explain how pachinko machines from Japan can electronically alter payout percentages without altering the physical reel symbols?
- Suppose the machine decides its time for a BAR, the only BAR on the third reel, just as one passes the pay-line. Does it let the reel go one full turn and catch it on the next go-round?
- Suppose a physical reel stops on a paying combination by mistake, i.e. a symbol other than the virtual one pre-ordained. What happens then?
Thanks much.
Let me answer each question individually.
- It is just programming code that dictates to the machine that if the virtual reel stops on a cherry to make the actual reel stop on a cherry. There are actual notches on the reels which may help the machine to stop in the right place. If you peer through the glass at and angle you can sometimes see these notches. However, I am not an engineer and am not sure exactly how the machine knows to stop at just the right moment. It just take it for granted that it can.
- Theoretically, the casino could change the payout on a slot machine with just a remote control. The remote control could tell the machine to use any previously programmed virtual reels. Practically speaking, the major casinos need to get approval from the gaming authorities to change the payback of a machine. If they did get such authorization all a slot technician has to do is replace a chip inside the machine, known as an e-prom. This happens infrequently and would not warrant the expense of a remote control.
- It seems to me the reels spin at least several times before stopping.
- In the unlikely even that happened, then I think it would trigger a malfunction and the bet would be voided.
I will say that for class 3 slots by major slot makers like IGT, Bally, and Williams do not resort to these sort of tricks. With respectable slot machines every play has the exact same probability of winning. If you don't believe me then why don’t you go from machine to machine playing each one for half an hour.
Not often. Contrary to popular myth the casinos don’t tighten the machines on weekends or whenever it is busy. Here in Las Vegas the casinos have to fill out a form every time they change the percentage on each game. Most slot managers I have spoken with have a policy on what coinage is set to what return. I tend to think the most likely reason to change the percentage would a change in ownership and/or management, which do not happen often.
Slot Machine Betting
No. Neither the amount you put in nor the denomination affects the odds. The same is true of slots.
From what I hear anything you can configure at the machine you can configure remotely through the server. This would include the theoretical return percentage. However most casinos report that changing the theoretical return of a slot machine necessitates a lot of paperwork.
Even if it were effortless to move the slot machine return up and down, it strikes me as a conspiracy theory to think the casinos would do that on a player by player basis. Living here in Vegas, I hear all kinds of theories about the lengths the casinos go to in order to win, like pumping in oxygen and playing a subsonic mantra that says 'lose lose lose.' These are just urban legends. Most casinos correctly believe that if you give the player a good experience and a fair gamble then he will keep coming back. As they say, you can only slaughter a sheep only once, but you can shear it many times. (My webmaster, Michael Bluejay, who is a vegetarian, tried to get me to use this analogy instead: 'You can seize all of a sheep’s money only once, but you can force it to take you bowling many times.')
I asked a source of mine who works at one of the casinos that utilize this technology. Besides the Treasure Island, this technology is also used at casinos in California, Michigan, and Mississippi. Here is what he said,
'Nothing can be changed if there are credits on the game. The slot machine will always reject any changes sent when there are credits on the meter. In Nevada, the machine also has to be idle for four minutes prior to and following any changes. It’s also not completely transparent to anyone standing in front of the slot machine. A black window pops up that says ’Remote Configuration In Progress’ (or something like that).
We mainly use ours to change the available denominations on our games. Similar to how table games will raise minimum bets on when the casino is busier, we will remove lower denominations on Friday morning and return them on Monday morning.'
So, rest assured, that the slot manager can not tighten up a game on you just because he doesn’t like you. As long as you have credit in the game, nothing can be changed.
If you are implying the casino is changing the odds of the game while you're sitting there playing it, then I would say that is just a myth. To change the odds of a game, the slot maker would have to open up the game and change the EPROM chip. With server based game, where this can be done remotely, regulations require that the game be unplayed for a certain number of minutes before any changes can made.
If you are implying that the casino sets a slot machine loose for the first so many days, to draw new players, and then switches the EPROM to a stingier one, then I would disagree as well. That could easily be done, and legally, but I doubt it is. In my slot machine survey I found that any given casino was fairly consistent in how loose or tight they set their slots.
For the benefit of other readers, the way slot machines have usually work is that a chip inside the machine, called an EPROM chip, determines how loose or stingy the machine is. The vast majority of slots today still function this way. Contrary to popular myth, slots don’t achieve their desired return percentage by paying more when the actual return is too low and less when it is too high. Rather, it is just subtle changes in the reel stripping on video slots and the virtual weights on stepper slots. It is usually up to the casino manager which chip to put in. Some jurisdictions leave that decision up to the state. A common myth about these slots is that the slot manager can flip a switch in his office and cause any slot machine, or all of them, to pay more or less. The truth is a slot technician has to open up the machine and physically change the EPROM chips.

However, with the new generation of 'server-based slots,' the myth has potential to be a reality. Slots on this system can indeed be controlled remotely. The slot manager is now able to change the theoretical return, pay tables in video poker, denomination, as well as the entire game, in the comfort of his own office. Here in Nevada there are safeguards to prevent abuse of this power. The Gaming Control Board has the following regulation:
'The conventional gaming device or client station must be in the idle mode with no errors or tilts, no play and no credits on the machine for at least 4 minutes. After this time, the conventional gaming device or client station must be disabled and rendered unplayable for at least 4 minutes. During the time the machine is disabled a message must be displayed on a video screen or other appropriate display device notifying the patron that the game configuration has been changed.' — Technical Standards for Gaming Devices and On-line Slot Systems 1.140
So the slot manager couldn't tighten up the game you’re playing just because he didn't like your polka-dotted hat. However, in theory, he could loosen or tighten every machine that wasn’t being played. To finally get at your question, would he loosen and tighten the slots like a yo-yo depending on the time of day or day of the week? On my forum, I argued that would be bad business, but many who submitted comments disagreed with me. To help argue my side, I asked Nick Dillon, Executive Vice President/Assistant General Manager at the Barona Casino in San Diego County about it. Here is what he wrote back.
'The concern with SBG (server-based games) is that the manufacturers and most casinos are looking at it mostly from a cost savings (less slot techs/labor needed to convert games, etc) perspective. At Barona, we really only want it if it proves a true value to the player. We have approximately 80 units on the floor that we began testing a couple of years ago. We are not yet at the point where we can say there is a true benefit to the player. We have tested many aspects of these games but have never raised/lowered the hold based on time of day, day of week, etc. We have, however, tested some other things. One is changing the minimum denom based on day of week (penny during the week moved to nickel on the weekend, for example). The idea being the same as table games whereby the denom (table minimum bet) moves higher when demand is peaking. This maximizes revenue. However, we found that was not the case with our test (likely because tables are limited and full capacity during the increase, but slots generally are not, and because a “penny” player can actually be a “dollar” player regardless of what min denom he is playing). We found more dismay from guests that were used to finding their preferred game/denom and that it was now changed. We also tested changing only the default denom from penny to nickel. This is the denom that shows on screen when the game is idle. The majority of players may not be aware of multi-denom and play the default the majority of time. Again, we found no real difference in revenue.As evidenced by our Loose Troop and Manufacturers Best programs, best blackjack rules, loosest video poker, no ATM fees, etc. we truly believe the player deserves the best gamble he can get. We feel that providing the longest play time for the dollar is the best strategy we can employ. There is no need to play with hold percentages and adjusting them 1-3 points either way for a day or two. Of course, a Strip property may feel differently as they only have a limited amount of time to win the money.
We are hopeful that we can help push the manufacturers to continue to develop SBG in favor of the player. We are hopeful that a player can put his player card in and his preferred games, denoms, etc will appear for his enjoyment at whatever device he sits. There are so many opportunities for this to be a great product for the player, which we believe will be good for our casino and the industry. If cost savings also come, great, but that should not be the main focus of a product like this.' -- Nick Dillon
In conclusion, I think you are safe playing server-based slots. If you don’t believe me, keep an eye on the video poker pay tables. If you don’t see those going up and down on a daily basis, chances are the slot returns are being left alone as well.
This question was raised and discussed in the forum of my companion site Wizard of Vegas.
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While there are many who will offer up their own secrets and tricks to beating the odds when it comes to slot machines, the reality of the situation is that a foolproof system simply doesn’t exist.
Slot Machines For Sale
However, there are some strategies that many swear by that may increase your enjoyment of the game.
Taking Advantage of Multipliers

When you hit a jackpot, the amount you win is based on how much you bet. However, it oftentimes is not proportionate. Many machines use something called a multiplier to calculate your payout.
For example, if you’re playing quarter slots, you may have the option to play 25 cents, 50 cents or a dollar. When you win a jackpot, you might get paid $2.50 if you bet a quarter and $5 for 50 cents, but a dollar bet will pay out $20. As always, when you sit down at your machine, make sure you’re reading all available instructions so you know you understand your bets. In many cases, placing the maximum bet will also give you the highest-proportioned payouts.
Buy-a-Pay Slot Machine
Buy-a-pay slots can be tricky, so again, pay attention to the rules of our particular machine. Whereas many slots will allow you to buy more lines in order to increase your chances of winning, buy-a-pay machines allow you to buy combinations.
For example, if you play one credit, you will only win if the bar symbols line up. Play two credits, and you can hit the jackpot if either the bars or the cherries line up, while three adds the bell symbol in addition to the bar and cherry.
Increase your ways to win by selecting multiple paylines.
So, if you’ve only paid two credits and you get three bells in a row, you’ll win nothing. Because of this, it’s generally advisable to bet the maximum on buy-a-pay slots in order to increase your ways of winning on any given spin.
Hitting Jackpots on Progressive Slots
You may have noticed a theme by now, but it’s often considered a good idea to bet the maximum amount on progressive slots, and here’s why.
Progressive slots are recognizable because of the large scrolling ticker positioned above the bank of machines. It shows a high dollar amount that is almost always steadily climbing upward. This is the top jackpot that you can win when playing these machines. The reason the dollar amount keeps increasing is because every time someone places a bet, a percentage of the money they put into the machine is sent right to the jackpot. The more people play, the higher the jackpot climbs.
The deal is, while everyone’s bets get applied to the jackpot, not every player can win it. If you’re not paying out the maximum bet with each spin, you are likely only qualified to win a smaller jackpot. Because the top prizes of progressive slot machines offer some of the largest payouts in most casinos, it’s often advised not to pay these unless you’re betting the maximum amount available.
Also, bear in mind that when these jackpots climb into the millions and tens of millions, the odds of you winning that prize are roughly equivalent to winning the lottery.
Myths
As in any game of chance, there are plenty of rumors floating around that promise to be the key to certain victory over the slots. Here are a few of the most pervasive slot machine myths.
- Machines run hot or cold. This is untrue, as each spin of the machine is completely randomized and takes no bearing from any spin before it. Each round, you have an equal likelihood of winning and losing. So there is really no such thing as a “cold” machine that is likely to keep losing or a “hot” machine that will keep paying out.
- Change machines after a jackpot – it’s not going to hit again for a while. This myth is similar to the last one, though incredibly pervasive. Again, because each spin is randomized, you have the exact same chances of winning each time you spin, regardless of how recently the machine last paid out.
- Each machine is programmed to pay out set percentage of money bet, so after it hits a jackpot, it is going to pay out a smaller amount for the rest of the day. There is no such percentage – each machine has set odds that do not change regardless of past payouts.
- There is a cycle of payoffs that each machine goes through – therefore, after it is completed, it will repeat the same pattern. Just as there was no percentage, there is no cycle. Each spin is random.
- Sitting down at machines in high traffic areas – those by the doors or aisles – are the loosest slots in the casino, and will pay off better than machines in corners or in the middle of a bank. The reason behind this extremely pervasive myth is that the casinos want its customers to see people winning to encourage more players. However, it simply isn’t true that you’ll get a better payoff at a machine near the casino’s entrance.
- Going into a casino during off-hours or slower days will give you better odds than you would get when the casinos are usually crowded. First of all, it’s just not that simple to change the programming on a slot machine manually. Usually, they need to have a chip manually replaced, which requires physically opening the slot machine. While, there are new slot machines that can be changed remotely, they are very rare, require specific circumstances to be legally changed and will display a notice after they’ve been serviced. Basically, the time of day you visit will have no effect on your odds of winning.