WO1998056474A9 - Reel-type slot machine utilizing random number generator for selecting game symbols - Google Patents
Reel-type slot machine utilizing random number generator for selecting game symbolsInfo
- Publication number
- WO1998056474A9 WO1998056474A9 PCT/US1998/012323 US9812323W WO9856474A9 WO 1998056474 A9 WO1998056474 A9 WO 1998056474A9 US 9812323 W US9812323 W US 9812323W WO 9856474 A9 WO9856474 A9 WO 9856474A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- reel
- display
- slot machine
- type slot
- indicia
- Prior art date
Links
Classifications
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
- G07F17/3244—Payment aspects of a gaming system, e.g. payment schemes, setting payout ratio, bonus or consolation prizes
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
- G07F17/3202—Hardware aspects of a gaming system, e.g. components, construction, architecture thereof
- G07F17/3204—Player-machine interfaces
- G07F17/3211—Display means
- G07F17/3213—Details of moving display elements, e.g. spinning reels, tumbling members
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07F—COIN-FREED OR LIKE APPARATUS
- G07F17/00—Coin-freed apparatus for hiring articles; Coin-freed facilities or services
- G07F17/32—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements
- G07F17/34—Coin-freed apparatus for hiring articles; Coin-freed facilities or services for games, toys, sports, or amusements depending on the stopping of moving members in a mechanical slot machine, e.g. "fruit" machines
Definitions
- the present invention relates to reel -type slot machines, and more particularly to reel -type slot machines having multiple display reels each bearing a plurality of different game symbols, wherein the reels are driven to display game symbols selected for each reel by a random number generator and look-up table.
- reel -type slot machines have evolved from mechanical type machines wherein mechanical clutches were relied on to stop spinning display reels at random locations to display a game result, to electronic type machines wherein a microprocessor randomly selects a game result, and the display reels are driven to reel positions wherein game symbols on the reels display the game result.
- the present invention is directed to an improvement in such an electronic type slot machine wherein a random number generator randomly selects a number within a predetermined set of random numbers, the randomly selected number is associated with a game symbol for each reel within a look-up table, and each reel is positioned to display its respective game symbol.
- the odds of a particular game result occurring can be predetermined for the machine .
- the reels are typically positioned by stepper motors, which may be contained in removable modules within the machine.
- the stepper motors respond to applied signals which are progressively phase-shifted relative to each other such that the stepper motors are caused to turn one element of rotation for each progression of the phase signals.
- the phase signals are typically generated in motor drive circuits, which respond to applied motor stepping pulses to advance the reels in increments.
- the motor stepping pulses are generated by a microprocessor, a predetermined number of pulses being generated to cause each motor to be incremented to a selected stopping position wherein the game result is displayed by the display reels.
- the stopping positions were determined by the microprocessor by either counting the number of motor pulses occurring after a "home" marker on the reel had passed a fixed sensor, or by counting markers provided on the reel for each symbol position after the home marker had passed.
- the present invention is directed to a reel -type slot machine wherein in response to a play command the microprocessor selects a random number within a predetermined set of random numbers, the selected random number is associated with game symbols within a memory device providing a look-up table, and the display reels are rotated to display the game symbols.
- the invention is directed to a slot machine comprising a rotatably mounted reel containing a plurality of game symbols, a stepper motor having a drive shaft rotatably coupled to the reel, a game control circuit responsive to a play command for randomly picking a random number, utilizing the random number in a look-up table to select game symbols, and causing the stepper motors to drive the reels to display the selected symbols.
- Figure 1 is a perspective view of a reel -type slot machine constructed in accordance with the invention.
- FIG 2 is a perspective view of the slot machine of Figure 1 with its cabinet open to show the principal components of the machine.
- Figure 3 is a perspective view of one of the removable reel assemblies utilized in the slot machine of Figures 1 and 2.
- Figure 4 is an enlarged exploded view of the reel assembly of Figure 3.
- Figure 5 is an enlarged front view of the reel assembly of Figures 3 and 4.
- Figure 6 is a side cross-sectional view of the reel assembly taken along line 6-6 of Figure 5.
- Figure 7 is a functional block diagram illustrating the operation of the slot machine of Figures 1 and 2.
- Figure 8 is an illustration of a representative arrangement of game symbols and game symbol -indicating indicia on the three display reels of the slot machine of Figures 1 and 2.
- Figure 9 is a simplified schematic diagram partly in functional form illustrating the operation of the slot machine of Figures 1 and 2.
- Figures 10A-10E depict a table showing the association between random numbers and game results in the slot machine of Figures 1 and 2.
- Figure 11 illustrates an EPROM for implementing the table of Figures 10A-10E.
- Figure 12 illustrates the date content of the EPROM of Figure 11.
- Figure 13 illustrates an alternate form of EPROM for implementing the table of Figures 10A-10E.
- Figure 14 illustrates the date content of the EPROM of Figure 13.
- Figure 15 is a flow chart illustrating the use of the EPROM of Figure 13 in the slot machine of Figures 1 and 2.
- Figure 16 is an enlarged exploded view of an alternate form of the reel assembly of Figure 3.
- Figure 17 is a cross-sectional view of the reel assembly of Figure 16 taken along line 17-17 of Figure 16.
- Figure 18 is an illustration of a representative arrangement of game symbols and game symbol -indicating indicia on the alternate form of reel assembly of Figures 16 and 17.
- Figure 19 is a simplified schematic partially in functional block form illustrating the operation of a slot machine utilizing the alternate reel assembly of Figures 16-18.
- Figure 20 is an enlarged schematic diagram of a portion of the functional block diagram of Figure 19.
- Figure 21 is a simplified schematic diagram of the ramp-up circuit utilized in the slot machine of Figure 19.
- Figure 22 is a simplified schematic diagram of the ramp down-circuit utilized in the slot machine of Figure 19.
- a reel-type slot machine 20 constructed in accordance with the invention is seen to include a cabinet 21 having a display window 22. Game symbols 23-25 contained on respective reels 26-28 ( Figure 2) of individual plug-in reel assemblies 30-32 are visible on a pay line 29 through the window. It will be understood that the slot machine can be constructed with a greater or lesser number of display reels.
- slot machine 20 includes a coin slot 33 (Figure 1) for receiving coins, a tray 34 for dispensing coins, and a user-actuated play handle 35 for initiating game play.
- slot machine 20 further includes a coin dispensing unit 36 ( Figure 2) of conventional design and an electronic game control module 37 for controlling game operation.
- this module among its other control functions provides drive signals to reel assemblies 30-32 to cause reels 26-28 to display game symbols corresponding to a particular game result on pay line 29.
- reel assembly 30 which may be identical to the other reel assemblies except possibly for its symbol make-up, is seen to include a stepper motor 40 having a shaft 41 on which display reel 26 is received.
- the reel includes an outer rim portion 42 on which game symbols 23 are contained, and an inner rim portion 43 concentric with the outer portion on which symbol -indicating indicia in the form of a plurality of apertures 44 arranged side-by-side in three columns.
- the two reel portions 42 and 43 are carried on shaft 41 at a fixed angular position relative to each other.
- the entire display reel 26 is formed as a single piece which can be conveniently installed on and removed from shaft 41.
- a flat 45 may be formed on shaft 41 to provide positive rotational coupling between stepper motor 40 and the reel.
- a generally A-shaped frame 46 is provided to position motor 40 such that one symbol position on the outer rim portion 42 can be seen on pay line 29 through window 22 when reel assembly 30 is installed in cabinet 21.
- a detector assembly 47 on frame 46 operates in conjunction with the indicia 44 on the inner rim portion 43 to identify the game symbols as they approach window 22.
- An electrical connector 48 is provided on one leg of frame 46 to enable electrical connections to be made with the reel assembly when the reel assembly is installed in cabinet 21.
- reel 26 includes a hub portion 49 which is received over motor shaft 41.
- An aperture 50 in the hub portion receives the motor shaft.
- a spring 51 within the hub portion engages the flat 45 on the shaft to secure the hub on the shaft, and prevent independent reel rotation.
- a set screw may be provided in the hub portion for the same purpose.
- Detector assembly 47 is seen in Figure 6 to include a housing having two projecting portions 52 and 53 which form a slot 54 through which the inner rim portion 43 passes.
- the upper portion 52 includes three light sources in the form of LEDs 55a-55c and the lower portion 53 includes three photodetectors 56a-56c.
- LEDs 55a-55c and detectors 56a-56c are aligned with rim portion 43 such that the three columns of symbol -indicating apertures 44 contained thereon pass between respective paired LEDs and detectors with rotation of the reel. In this way, the passage of each set of apertures is sensed, and, in a manner to be explained, the game control circuits determine when a particular game symbol is about to be displayed in window 22.
- slot machine 20 The basic operation of slot machine 20 is functionally illustrated in Figure 7.
- a coin is received.
- the microprocessor-driven game control circuits utilizing a conventional stored algorithm, generate a random number within a predetermined range of random numbers .
- the number may be one of 268,435,456 numbers in a range of 0 to 268,435,455.
- this number is utilized in conjunction with a stored look-up table in an EPROM or similar memory device to select a game result comprising, in this three reel embodiment, three game symbols SYM1 , SYM2 and SYM3.
- all three reels are caused to spin.
- the first reel 26 continues to spin for a first predetermined free spin period, typically one second, and upon completion of this period at 64 a stopping procedure is initiated at 65 whereby signals developed by the game symbol -indicating apertures 44 passing detector 47 are compared with signals corresponding to the desired game symbol SYM1.
- a stopping procedure is initiated at 65 whereby signals developed by the game symbol -indicating apertures 44 passing detector 47 are compared with signals corresponding to the desired game symbol SYM1.
- the application of normal drive signals to stepper motor 40 is interrupted and a stop routine is initiated at 66 to stop the display reel with the desired symbol displayed.
- the second display reel 27 continues to spin, and upon completion of a second predetermined spin period, also typically one second, at 67 following the stopping of reel 26 the signals generated by the symbol -indicating apertures on reel 2 are compared at 68 with signals corresponding to the desired game symbol SYM2 for reel 27, and upon occurrence of a comparison a stop routine is initiated at 69 to cause reel 27 to stop with the desired game symbol for that reel displayed.
- a second predetermined spin period also typically one second
- the third display reel 28 continues to spin through a third one second predetermined free spin period at 70 following the stopping of reel 27 until at 71 a comparison of the signals generated by the symbol - indicating apertures 44 thereon with a signal corresponding to the desired symbol to be displayed on the reel is obtained and a stop routine 72 causes the reel to stop with the intended game symbol displayed through window 22 on pay line 29.
- the monitoring system signals a spin error at 73, an alarm is sounded and the game is inhibited at 74.
- each of the three display reels 26-28 has 22 display positions, containing 11 blanks and 11 symbols.
- the symbols and blanks appear on the outer rim portions 42 of the reels in alternation, a blank space appearing between each pair of consecutive game symbols.
- Indicia comprising a three bit binary code is associated with each symbol by the provision of thin slit- shaped apertures on the inner rim portion 43 of each display reel . These binary codes are unique to their associated symbol or blank, and are arranged in three columns A-C around the reel rim portions 43.
- the angular displacement of the leading edge of the codes to the symbols may range from 0° to 180°, depending on the location of sensors 47 relative to the pay line, and on the angular rotation required to stop the reel.
- the stop is essentially instantaneous and the displacement is 115°.
- the displacement is 155° (115° + 40°) .
- While the illustrated reel set shows 22 symbol positions with 11 blank spaces and 11 game symbols of 6 different types (e.g., for reel 30; two triple bars, two double bars, two single bars, two cherries, 3 sevens), it will be appreciated that a greater or lesser number of symbol positions can be provided with a greater or lesser number of symbols and symbol types.
- Game control circuits 37 which typically include a microprocessor and associated memory and input-output circuits depicted functionally in Figure 9 as game circuits 77, receive signals from a conventional coin-in detector 180 and a conventional spin switch 181, which may be either a panel - mounted push button switch or a switch actuated by play handle 35.
- the microprocessor utilizing a stored random number generating algorithm, the function of which is generally designated in Figure 9 by a random number generator 78 (RNG) , generates a random number which may be, for example, in a 28 bit system one of 268,435,456 possibilities within a predetermined range of 0 to 268,435,455. This number is applied to a memory device 79, preferably taking the form of a plug- in EPROM 79, in which a look-up table has been stored.
- RNG random number generator
- the look-up table contains a specific game result in the form of a blank or game symbol (7, bar, double bar, triple bar, or cherry) for each reel for each applied random number.
- the game result symbols are each separately output from the EPROM as a three bit binary signal which is applied to a respective one of three comparators 80-82.
- stepper pulses generated by a clock 83 and a divider 87 are applied to individual motor phase signal generating circuits 88-90 associated with reel assemblies 30-32, respectively.
- Circuits 88-90 provide progressively advancing quadrature phase signals in response to the applied stepper pulses to stepper motor drive circuits 91- 93, respectively.
- the outputs of each drive circuit are applied to the four stator windings of the associated stepper motor 40 in a conventional manner whereby the stepper motor is caused to incrementally rotate in response to each stepper pulse.
- display reels 26-28 rotate the detectors 47 associated with each reel read the game symbol -indicating apertures 44 on the reels.
- game control circuits 77 include three delay circuits 100-102.
- Delay circuit 100 which is triggered by actuation of spin switch 181 through an inverter 103, may provide a delay, for example, of approximately one second. During this delay period AND gate 94 is inhibited by the delay circuit, preventing the application of a stop signal from comparator 80 to AND gate 84 through inverter 97.
- Delay circuit 101 which is triggered by the stop signal at the output of AND gate 94, similarly prevents the output of comparator 81 from inhibiting AND gate 85 through inverter 98 for approximately one second following the stopping of display reel 26.
- Delay circuit 102 in like manner prevents the output of comparator 82 from inhibiting AND gate 86 for one second following the stopping of display reel 27.
- an RS flip-flop 104 which is set by the output of AND gate 96 when the third reel 28 comes to rest.
- the Q output of this flip-flop is applied to an AND gate 106, which inhibits the application of stepper pulses to the motor phase signal circuits.
- the Q output of RS flip-flop 104 is applied through an inverter 107 to a NAND gate 108, which also receives the output of a delay circuit 109 triggered by spin switch 181.
- NAND gate 108 produces an output which is applied through NAND gate 110 to an alarm circuit 111 and through an inverter 112 to an inhibiting input of coin hopper 36.
- control circuits 77 have been shown and explained in terms of certain logic components, it will be appreciated that the same functionality can be readily obtained by means of a conventional microprocessor using well known programming techniques. For example, in the present embodiment all the functions of circuits 77 can be accomplished using, for example, a type ATMEL 89C2051 microprocessor in conjunction with an appropriate EPROM and conventional and well known peripheral components. Furthermore, while a three reel machine is shown, one or more additional reels can be provided utilizing the control methods described for reels 26-28.
- random number generator 78 be capable of providing random numbers within a wide range of possibilities. In particular, to provide a desirable one million dollar payout on a one dollar bet a probability of less than
- the random number generated by EPROM 79 must be at least 24 bits.
- a 28 bit random number generator is preferably used, providing a range or set of random numbers from 0 to 268,435,455.
- FIG. 10A-10E A look-up table implementing the 28 bit random number in a representative game having the five different symbols depicted in Figure 7 is shown in Figures 10A-10E. Referring to these Figures, it is seen that 216 different combinations of the symbols on three reels, i.e., 216 different game results, are possible. Each of the different game results is given a subset within the 0- 268,435,455 set of random numbers. Certain winning combinations of symbols (such as
- the look-up table embodied in EPROM 79 provides the game designer a high degree of flexibility. By varying the size of a subset of random numbers which will give a particular game result, i.e., a particular set of game symbols, the odds of occurrence of that result, and hence the payout which can be assigned to that result, can be readily set. Since these selections are contained in a replaceable EPROM, the make-up of the game can be easily changed to provide greater or lesser odds (and hence greater or lesser sized payouts) , and more frequent or less frequent payouts.
- a 262M x 29 EPROM 120 suitable for use in implementing the look-up table of Figures 10A-10E in control circuits 77 is shown in Figures 11 and 12.
- the 28 bit random number generated by random number generator 78 is entered on pins A ⁇ -A27.
- Symbols SYM1 , SYM2 and SYM3 for reels 26-28 are derived on pins O ⁇ -02, 03-05, and 06- 08, respectively.
- the payout (0-1,000,000) requiring 20 bits, is provided on pins 09-028.
- EPROM 120 provides on its output pins three three bit binary numbers representing the three game symbols of the game result, and one 20 bit number representing the payout for that game result.
- the look-up table in the 2KX8 EPROM 121 is condensed to require only eight bytes for each of the 216 possible game results.
- the first three bytes (24 bits) encode the weight of the subset (the span between the "From" and “To” entries in Figures 10A-10E) .
- Two bytes (16 bits) encode the game results (the three game symbols, 3 bits for each reel) , and three bytes (24 bits) encode the amount of payout (up to 16,777,215 times the bet, if all 24 bits are used).
- each consecutive block of eight bytes in the EPROM represent a single line entry, as shown in Figure 14.
- the total size of the EPROM need be only 1728X8.
- the method of accessing the condensed look-up table in EPROM 121 is shown in Figure 15.
- a 28 bit random number is generated at 61 as previously described.
- the first EPROM address is accessed.
- the first three bytes beginning at that address are assembled into a 24 bit number representing the size or weight of the subset represented by the address. If the random number is greater than the accessed subset weight at 124, then at 125 the subset weight is subtracted from the random number and the next table entry is accessed at 126.
- the weight of the subset represented by this address is obtained by combining the first 3 bytes beginning at that address into a 24 bit number. This number is compared with the previously modified random number at 124.
- the weight is again subtracted and the look-up procedure is repeated. If the random number is less than the subset weight derived from the table, the next two bytes of the accessed data are utilized at 127 to specify the game result, i.e., the game symbols to be displayed by the three display reels (3 sets of 3 bits each) . The last three bytes (24 bits) are combined at 128 to specify the payout amount, if any. The game results and payout being specified, the routine ends at 129 and the reels are repositioned to display the game results, as previously described.
- stepper motor drive circuits 91-93 for a ramp-up period following a spin command (as when spin button 181 is actuated) and for a ramp-down period following a stop command (as when a comparator generates a stop signal) .
- an advantageous construction for obtaining a stop initiating command is to provide an additional set of binary coded indicia 130 (Figure 18) angularly displaced from the symbol -indicating stop indicia associated with the displayed game symbol.
- This additional stop initiating indicia which preferably utilizes the same 3 bit binary coding as the stop command indicia, is differentiated from the stop indicia by the presence of a fourth bit, contained in a fourth column D in Figure 18.
- the fourth bit may be represented by an aperture which is shorter than the apertures representing the other three bits so as to act as a strobe bit for greater precision in detecting the passage of the symbol code.
- An additional LED light source 131 and associated photosensor 132 are provided in a sensor assembly 133 ( Figure 17) mounted on the reel assembly frame to detect the additional bit. As shown for the three display reels 26-28 in
- the stop initiating indicia are spaced ahead of the stop-indicating indicia by an angular displacement sufficient to allow the display reel to be ramped down to a slow stopping speed prior to the reel reaching the stop position.
- the application of the slow stepping pulses is interrupted and the reel abruptly stops.
- three ramp-down circuits 135-137 provide decreasing rate stepping pulses to stepper motor drive circuits 91-93 during the stopping routine, and a single ramp-up circuit 138 provides increasing rate stepper pulses during the starting routine.
- the operation of the ramp-down circuits is controlled by three RS flip-flops 139-141, which initiate the ramp-down routine, and three RS flip-flops 142-144, which stop the reels.
- the operation of ramp-up circuit 138 is controlled by spin switch 181.
- circuit 138 When the ramp-up routine is complete, circuit 138 provides an output to delay circuit 100, which times the free-spin period of reel 26 as previously described. After this free-spin period, AND gate 94 is enabled to allow the output of comparator 80 to initiate a stop routine. As before, comparator 80 is looking for a match with the symbol indicia provided by EPROM 79. However, the Q output of RS flip-flop 139, in its reset state, requires that the fourth bit associated with stop- initiating indicia also be present for a match. This prevents the comparator from responding to stop- indicating symbol indicia passing detector 133, and allows the comparator to respond to stop-initiating indicia on reel 26.
- RS flip-flop 139 When a match is recognized by comparator 80, RS flip-flop 139 is set, and AND gate 145 is inhibited to prevent stepper pulses from the ramp-up circuit 138 from being applied to motor phase signal circuits 88. At the same time, the Q output of RS flip-flop 139 enables an AND gate 148, allowing pulses from ramp-down circuit 135 to be applied to stepper motor drive circuits 91 through an OR gate 149.
- the comparator Since the ⁇ output of flip-flop 139 no longer requires comparator 80 to sense the fourth bit, the comparator responds to the next-occurring stop- indicating symbol indicia to provide a signal which is applied through an AND gate 150, upon receipt of a stop enabling signal from ramp-down circuit 135, to set RS flip-flop 142, which inhibits AND gate 148 to prevent further application of pulses to stepper motor drive circuits 91. Lack of the stop enabling signal from ramp-down circuit 135 prevents RS flip-flop 142 from being set by the comparison output which occurs with passage of the stop- initiating symbol indicia or with passage of any stop- indicating symbol indicia prior to the completion of a substantial portion of the ramp-down. Delay circuit 101 is actuated when RS flip-flop 142 is set to initiate the free spin period for display reel 27.
- Display reels 27 and 28 are controlled in a similar manner by RS flip-flops 140 and 141, which initiate the ramp-down routine, and RS flip-flops 143 and 144, which stop the reels in conjunction with AND gates 151-154 and OR gates 155 and 156 ( Figure 20) .
- RS flip-flop 104 The function of RS flip-flop 104 is as previously described, except that the device is set by the output of an AND gate 157, which provides a set signal when all three comparators 80-82 indicate a match (i.e., when all three display reels are displaying the game result symbols called for by EPROM 79) and RS flip-flop 144 is set, indicating that the third reel has stopped.
- AND gate 157 which provides a set signal when all three comparators 80-82 indicate a match (i.e., when all three display reels are displaying the game result symbols called for by EPROM 79) and RS flip-flop 144 is set, indicating that the third reel has stopped.
- one form of ramp-up circuit 138 suitable for use in slot machine 20 is seen to include three counters 160-162, a comparator 163, and an RS flip-flop 164. While the start signal is false, all three counters are held in reset and RS flip-flop 164 is reset. Upon actuation of spin switch 181, the start signal is true and counter 160 counts applied clock pulses until a count of 16 is reached, at which time the counter produces an output which inhibits further counting by the counter and enables counter 161 to count clock pulses. Counter 161 continues to count from zero until its output, applied inverted to comparator 163, compares to the initial zero count in counter 162.
- RS flip-flop 164 also resets counters 160 and 161, allowing counter 160 to again count clock pulses. With the next negative transition of the clock pulse, RS flip-flop 164 is reset and counter 162 is advanced one count. When counter 160 again reaches its maximum count of 16, counter 161 is again enabled and begins counting clock pulses. Since there is now a one count in counter 162, counter 161 needs only to count to 62 before its inverted output compares with the non- inverted output of counter 162 and comparator 163 produces an output which resets RS flip-flop 164. As before, this produces a stepping pulse for application to the stepper motor phase circuits, an increment of one count in counter 162, and a reset of counters 160 and 161.
- stepping pulses are produced with linearly increasing frequency as counter 161 counts to progressively lower counting states to match the progressively increasing counting state of counter 162.
- the ramp-up circuit may initially produce stepping pulses at 160 hertz, ramping-up in 64 linear steps to a pulse rate of 800 hertz, which it continues to produce until a subsequent start signal is received. With a nominal clock frequency of 12.8 KHz, this results in a ramp-up speed starting at 0.4 RPS and increasing to 2.0 RPS.
- the functioning of ramp-down circuit 135 is similar to ramp-up circuit 138 except that the outputs of counter 161 are applied to comparator 163 non- inverted.
- one form of ramp-down circuit 135 suited for use in slot machine 20 is seen to include three counters 170-172, a comparator 173 and an RS flip-flop 174. While the start signal is false, all three counters are held in reset and RS flip-flop 174 is reset. Upon actuation of spin switch 181, the start signal is true and counter 170 counts applied clock pulses until a count of 16 is reached, at which time the counter produces an output which inhibits further counting by the counter and enables counter 171 to count clock pulses. Counter 161 continues to count from zero until its output, applied to comparator 173, compares to the initial zero count in counter 172.
- counter 171 Since there is now a one count in counter 172, counter 171 needs to count to 1 before its output compares with the output of counter 172 and comparator 173 produces an output which resets RS flip-flop 164. As before, this produces a stepping pulse for application to the motor phase circuits, an increment of one count in counter 172, and a reset of counters 170 and 171. This cycle continues until counter 172 reaches its maximum counting state of 43, as determined by an AND gate 175, at which time counter 172 is no longer incremented and RS flip-flop 174 is regularly toggled at a fixed slow rate as counter 171 repeatedly counts to 63.
- the ramp-down circuit may initially produce stepping pulses at 800 hertz, and ramp- down in 45 linear steps to a pulse rate of 210 hertz, at which rate it continues to produce pulses until a stop signal is received. With a nominal clock frequency of 12.8 KHz, this results in a ramp-down speed starting at 2 RPS and ending at 0.4 RPS .
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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AU80709/98A AU8070998A (en) | 1997-06-13 | 1998-06-12 | Reel-type slot machine utilizing random number generator for selecting game symbols |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US87604697A | 1997-06-13 | 1997-06-13 | |
US08/876,046 | 1997-06-13 |
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WO1998056474A1 WO1998056474A1 (en) | 1998-12-17 |
WO1998056474A9 true WO1998056474A9 (en) | 1999-04-08 |
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PCT/US1998/012323 WO1998056474A1 (en) | 1997-06-13 | 1998-06-12 | Reel-type slot machine utilizing random number generator for selecting game symbols |
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US (2) | US6003867A (en) |
AU (1) | AU8070998A (en) |
WO (1) | WO1998056474A1 (en) |
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-
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Also Published As
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WO1998056474A1 (en) | 1998-12-17 |
US6003867A (en) | 1999-12-21 |
AU8070998A (en) | 1998-12-30 |
US5988638A (en) | 1999-11-23 |
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