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Parts of this mechanical Pace slot machine from Harolds Club are over 50 years old. It originally came in a wooden case but was "remodeled" in the 60's, wired for lights in a metal case with an automatic hopper to pay the $37.50 jackpot in coins. The coins are quarters and it has a tube with slides that drop the small pays. The maximum amount of coins from the tube is 20 at a time and the machine was originally configured to drop the $5 in coins and the attendant would pay the balance on the two larger pays. There are 25 stops on each reel so the cycle is 25x25x25 or 15,625 combinations and it's a single-coin machine so the cycle is 15,625 coins. Pay particular note to the picture of the "award glass" below. I'll go through the steps to create a "par sheet" on this machine showing the percentage paid out and the percentage the house keeps.

Pace slot Pace slot inside

Award glass Reels

This chart shows the reel strips:

Reel symbols

The chart below shows the odds and 93.47% payback on this machine. The first column shows the pay combination then the number of those symbols on each reel. Next are the odds of that configuration happening (multiplying the number of symbols on each reel) times the number of coins paid for that combination. The first line of the chart is the one cherry pay. There are 3 cherries on the first reel, 19 symbols that are NOT cherries on the second reel, and 25 any stops on the third reel. Only those combinations are going to hit the one cherry pay for 3 coins. On the second reel you've got to exclude all the cherries (there are 6) because if the second reel hits a cherry it would be a 2 cherry pay. The other pays are pretty straightforward, the 3 bars for instance are 6 bars on the first reel, 3 bars on the second reel and one bar on the third reel or 6x3x1=18 times 150 coins each time=2700 coins paid in the cycle.

Odds for each pay

This is an easy par sheet. Multiple-coin machines, bonus pays, pays in any position in the window, etc., make this process much more complicated. I'll give you an easy example changing this 25-stop physical reel to a virtual reel. Let's make it 27 stops and add 2 more bells to each "reel" in the computer's memory. We don't need to change the physical reel at all, it just displays a bell (any bell) when that symbol is selected. We only need one bell, actually, on the physical reel no matter how many bells are in the computer's reel strip--it just displays the same bell over and over. How does this change the pays? First of all it's 27x27x27 or 19,683 for a cycle. The 3 bells pay (including 2 bells and a bar, see award glass) would be 7x3x11=231 x 18 coins paid each time=4,158. The odds on the one and two cherry pays would change too, to 5,103 and 1,800 total coins, because we have raised the "any" number by 2 positions on the strip that are NOT cherries. That would make total pays 18,961 out of the new 27 position cycle of 19,683 and we have raised the payout to 96.33%. And, of course, on a "virtual reel" machine you change these odds just by plugging in a new chip, you don't need to change the physical reel or the award glass.

For more slot machine information see Slot Percents

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