Reel type slot machine utilizing random number generator for selecting game result
First Claim
1. A reel-type slot machine comprising:
- a user actuated spin switch for providing a play command;
at least one display reel having a plurality of different game symbols thereon, said display reel being rotatably mounted to selectively display one of said game symbols;
reel drive means responsive to said play command for rotatably driving said display reel;
selection means responsive to said play command for randomly generating a random number from a predetermined set of random numbers;
memory means for providing a game result from a predetermined set of potential game results for each random number in said set of random numbers, each of said game results requiring display of an associated predetermined game symbol by said display reel, said memory means providing a display control signal indicative of said predetermined game symbol; and
display control means responsive to said display control signal for causing said reel drive means to position said display reel to display said predetermined game symbol wherein said predetermined set of potential game results includes an undesired, and wherein said memory means stores a zero probability at a random number for said undesired game result.
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Accused Products
Abstract
A reel-type slot machine includes a microprocessor driven game control circuit for randomly selecting a game result. Three reel assemblies each include a symbol-bearing display reel driven by a stepper motor for displaying game symbols corresponding to the game result. A random number generator within the game control circuit generates a random number within a predetermined range of random numbers for application to a look-up table wherein a game result consisting of three game symbols is identified. Each potential game result is associated with a subset of random numbers within the total range of random numbers. The size of the subset determines the probability of the game result occurring. An undesired game result may be avoided by providing no corresponding subset. After the game result symbols have been identified, the display reels are driven by the stepper motors to display the game symbols. Optional ramp-up and ramp-down circuits provide improved stepping accuracy.
267 Citations
50 Claims
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1. A reel-type slot machine comprising:
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a user actuated spin switch for providing a play command; at least one display reel having a plurality of different game symbols thereon, said display reel being rotatably mounted to selectively display one of said game symbols; reel drive means responsive to said play command for rotatably driving said display reel; selection means responsive to said play command for randomly generating a random number from a predetermined set of random numbers; memory means for providing a game result from a predetermined set of potential game results for each random number in said set of random numbers, each of said game results requiring display of an associated predetermined game symbol by said display reel, said memory means providing a display control signal indicative of said predetermined game symbol; and display control means responsive to said display control signal for causing said reel drive means to position said display reel to display said predetermined game symbol wherein said predetermined set of potential game results includes an undesired, and wherein said memory means stores a zero probability at a random number for said undesired game result. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A reel-type slot machine comprising:
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a user actuated spin switch for providing a play command; a plurality of display reels each having a plurality of different game symbols thereon, said display reels each being rotatably mounted to each selectively display one of said game symbols; reel drive means responsive to said play command for rotatably driving said display reels; selection means responsive to said play command for randomly generating a random number from a predetermined set of random numbers; memory means for providing a game result from a predetermined set of potential game results for each random number in said set of random numbers, said game result requiring display of a predetermined game symbol on each of said display reels, said memory means providing a display control signal for each display reel indicative of said predetermined game symbol to be displayed by that reel; and display control means responsive to said display control signals for causing said reel drive means to position said display reels to display said predetermined game symbols wherein said predetermined set of potential game results includes an undesired, and wherein said memory means stores a zero probability at a random number for said undesired game result. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A reel-type slot machine comprising:
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a user actuated spin switch for providing a play command; at least one display reel having a plurality of different game symbols thereon, said display reel being rotatably mounted to selectively display one of said game symbols, and including indicia thereon indicative of each game symbol thereon; reel drive means responsive to said play command for rotatably driving said display reel; a random number generator responsive to said play command for randomly generating one random number from a predetermined set of random numbers; a memory device comprising a look-up table responsive to said random number for generating a display control signal indicative of a predetermined game symbol corresponding to said selected random number to provide a game result from a predetermined set of potential game results for each random number in said set of random numbers; and indicia detection means fixedly positioned relative to said display reel for providing a tracking signal indicative of the passage of each of said game signals during rotation of the reel; display control means responsive to said display control signal and said tracking signal for causing said reel drive means to position said display reel to display said predetermined game symbol wherein at least one undesirable game result is eliminated from said predetermined set of potential game results by having a probability of the at least one undesirable game result set to zero. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34)
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35. A reel-type slot machine comprising:
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a user actuated spin switch for providing a play command; a plurality of display reels each having a plurality of different game symbols thereon, said display reels each being rotatably mounted to selectively display one of said game symbols and including indicia thereon indicative of each game symbol thereon; reel drive means responsive to an applied control effect for rotatably driving said display reels; a random number generator responsive to said play command for randomly generating one random number from a predetermined set of random numbers; a memory device comprising a look-up table responsive to said random number for generating a display control signals indicative of predetermined game symbols for display respectively by each of said reels to provide a game result from a predetermined set of potential game results for each random number in said set of random numbers; indicia detection means fixedly positioned relative to said display reels for detecting the passage of said indicia as said display reels rotate to produce respective symbol-indicating tracking signals; and display control means responsive to said display signals and said tracking signals for stopping said reels to display said predetermined game symbols wherein at least one undesirable game result is eliminated from said predetermined set of potential game results by having a probability of the at least one undesirable game result set to zero. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42)
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43. A reel-type slot machine comprising:
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a user actuated spin switch for providing a play command; at least one display reel having a plurality of different game symbols thereon, said display reel being rotatably mounted to selectively display one of said game symbols; reel drive means responsive to said play command for rotatably driving said display reel; selection means responsive to said play command for randomly generating a random number from a predetermined set of random numbers; means for assigning a game symbol to each random number within said set of random numbers; memory means providing a game result from a predetermined set of potential game results for each random number in said set of random numbers; said display reel including first and second sets of indicia associated with and indicative of each of said game symbols, said first and second sets of indicia being angularly displaced from each other; detector means for detecting the passage of said indicia as said display reel rotates to produce a symbol-indicating tracking signal; and display control means responsive to said signal indicating said first set of indicia for slowing the rotation of said reel, and responsive to said output signal indicating said second set of indicia for stopping said reel wherein selection of at least one undesirable potential game result is eliminated from a predetermined set of potential game results by having a probability of each undesirable game result set to zero. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
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Specification