JP2015073609A - Chip capable of selecting system reset or user reset - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a computer chip capable of arbitrarily selecting either system reset or user reset as dealing with occurrence of an internal reset factor on the basis of preset reset management information.SOLUTION: Security reset to execute initialization during a random security check time including a delay time that is set to a different value for each game machine, and user reset to execute initialization by shifting to a user mode not through a security mode are switched on the basis of the preset reset management information. Thus, each development user is enabled to arbitrarily designate the selection of setting to execute the system reset when placing value on security or setting to execute the user reset when placing value on the shift to the user mode within a short time.

Description

  The present invention relates to a gaming machine control microcomputer having a function of selecting whether to perform a system reset or a user reset when an internal reset of a gaming machine represented by pachinko or pachislot is executed.

  Internal reset factors that occur when the CPU runs away include WDT (watchdog timer) and IAT (illegal address trap). In order to cancel the runaway of the CPU, it is necessary to perform a reset. The reset includes a “system reset” and a “user reset”.

  Here, the state transition of a microcomputer (hereinafter referred to as “main chip”) that controls the gaming machine will be described. In the gaming machine, a program developed by a gaming machine manufacturer is stored in a non-volatile memory called a user ROM in the main chip. The fraudulent act of manipulating the number of balls and the number of jackpots is performed by rewriting this user program. As one countermeasure against fraud, a security check function that stops the operation of the CPU when a program in the user ROM is altered is mounted on the chip.

  FIG. 1 shows a mode transition diagram of the main chip. First, when the main chip is powered on and a reset signal is input, the security mode is entered and a security check is executed. In this security check, when it is determined that the user program is legitimate (no alteration), it is possible to shift to a user mode in which a normal game is executed according to the user program. If an internal reset factor such as WDT occurs during the user mode, execute the system reset to operate the user program after initializing the CPU in the security mode following the same procedure as when the power is turned on, or the user mode This is dealt with by executing a user reset to return to the start state. Since the user reset enters the user mode without going through the security mode, an interrupt without the security mode is started.

  If the security mode elapses after the system reset signal is input and then the user mode is entered and the time until the first jackpot is constant, the jackpot occurrence timing is calculated from that time, and the jackpot is unexpectedly generated. In some cases, misconduct occurred. As a countermeasure against such fraud, information for making the security check time in the security mode variable is set in the user ROM in the main chip, and if there is a system reset input, the information in the user ROM is changed. Based on this, the security check time is randomly changed (for example, Patent Document 1 below).

  In user reset, the user mode is started at the same timing, so it is easy to predict the jackpot occurrence timing, and there is a high risk that the prediction can be developed across a plurality of gaming machines and the random number value can be manipulated artificially. . On the other hand, in the case of a system reset, the rise time of the CPU can be varied with a random security check time, so that the time from the input of the system reset to the start of execution of the user program cannot be predicted from the outside. Has the advantage of being possible.

JP 2005-342355 A

  However, when an internal reset factor such as WDT occurs, if a system reset is performed, it takes time to shift to a user mode in which a user program is executed, so that a user reset is often performed. While it is convenient to perform a user reset in terms of time to recover the CPU quickly, the user reset is used as an internal reset factor because the above-mentioned random security check time is not considered. Security, that is, fraud countermeasures are not perfect.

  Therefore, the present invention has been made in view of the above problems, and provides a chip that can arbitrarily select a system reset and a user reset as a response when an internal reset factor occurs based on preset reset management information. The purpose is to do.

  The gaming machine computer chip of the present invention has a state transition between a security mode related to a security check and a user mode related to a desired gaming process. (I) When a reset signal is input, the gaming chip has a different value for each gaming machine. System reset for executing initialization of the gaming machine computer chip by shifting to a security mode having a random security check time obtained by adding a set delay time to a predetermined security mode time, and (ii) inputting a reset signal When this happens, reset management information for designating either one of the user reset and the user reset that executes the initialization without passing through the security mode is stored, and the watchdog timer and illegal address trap are stored. When the occurrence of internal reset factors including System reset or user reset is selected based on the reset management information.

  In addition, the computer chip for gaming machine of the present invention is switched to the user mode after the security check is executed in the security mode, and the gaming process according to the predetermined user program is executed. It is stored in advance in an initial setting area in the program, and is read from the initial setting area when occurrence of an internal reset factor is identified.

  According to the computer chip for gaming machine of the present invention, the system reset for shifting to the security mode characterized by the security check time being constant and random, and switching between shifting to the user mode without going through the security mode Is executed based on the reset management information, so if security is a priority, set the system reset to be executed, and if the focus is on shifting to user mode in a short time, a user reset is executed. Flexible selection such as setting is possible.

  Therefore, if it is inconvenient to start the initialization process by intentionally causing the CPU to run away due to noise or the like, and to perform a user reset for an unauthorized act that controls the generation of random numbers, the system reset is selected. The system reset advantage that makes it difficult to predict the jackpot timing from the initial state can be applied to internal reset factors such as a watchdog timer and illegal address trap.

It is a general mode transition diagram of a computer chip in a control board installed in a gaming machine. It is a figure showing the operation mode of the main chip of the gaming machine of the present invention. It is a figure showing the state from which the security check time until it transfers to user mode from the time of inputting system reset in security mode changes. It is a figure which shows an example of the additional delay time and extension time relevant to security check time.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing an operation mode of the main chip of the gaming machine. After the power is turned on, a system reset signal is input to the main chip. In this case, the security mode 10 is first set. In the security mode 10, for example, a boot program is read from a boot ROM in the main chip, and initialization is performed to redo various settings in the CPU. If the security check is OK in the security mode 10, the mode shifts to the user mode 20.

  When a reset factor such as WDT or IAT occurs, the main chip performs a process of selecting whether to perform system reset or user reset. Which one to select is determined based on the reset management information, and this reset management information is stored in advance in an initial setting area in the user program. Therefore, when the main chip identifies that a reset factor such as WDT or IAT has occurred, the main chip reads the reset management information from the initial setting area.

  If the development user who focuses on security focuses on system reset and shifting to user mode in a short time, information that specifies user reset should be set in advance in the initial setting area as reset management information. deep. The reset management information is information that cannot be rewritten by a user program executed in the user mode.

  Depending on the read reset management information, either reset in the security mode or user reset in the user mode will be executed. Therefore, the development user using the main chip, such as WDT or IAT It becomes possible to flexibly determine whether to select a system reset or a user reset for a reset factor.

  FIG. 3 shows the reason why the security check time changes from when the system reset is input in the security mode to when shifting to the user mode. If the chip type (version) is the same, it has a fixed security mode time having the same value. However, a random delay time, an extended time, or a time obtained by adding both to the fixed security mode time is a security check. It's time.

  As shown in FIG. 4A, the random delay time is associated with the setting code (setting value). For example, it may be fixedly extended with an ID number unique to the main chip, or a random time for delaying may be determined based on a random value generated by a random number circuit within a certain time width such as 0 to 200 ms. Further, as shown in FIG. 4B, a predetermined extension time may be added for each setting code.

  Therefore, the time from when the system reset is entered to the main chip until the user mode is started is not always the same as the random delay time and extension time are added. It can be in a situation where the jackpot generation time is different (in individual gaming machines).

  The main chip has a counter that is not initialized by reset, and the delay time is varied randomly with the value of this counter as an initial value.

  As described above, the main chip of the present embodiment has a function of switching the risk that the jackpot timing is easily predicted to the system reset because there is no variability for each gaming machine due to the random security check time in the user reset. It is avoided by using it. In the past, internal reset factors such as watchdog timers and illegal address traps can be dealt with by system reset by any user selection (advanced setting) that can be handled by user reset. The main chip can be realized.

  In addition, the security check time is extended according to the code set in the program management area of each main chip, and further, a random delay time that is different for each power-on within a different time width according to the code is set. Therefore, even if the jackpot occurrence time of one gaming machine is analyzed by an unauthorized person, it can be easily realized by switching to the above-described system reset to prevent an illegal act against another gaming machine. Became.

10 Security mode 20 User mode

Claims (3)

A gaming machine computer chip having a security mode relating to a security check and a user mode state transition relating to a desired gaming process,
When a reset signal is input, the game machine computer chip is initialized by shifting to a security mode having a random security check time obtained by adding a delay time set to a different value for each gaming machine to a predetermined security mode time. Perform a system reset,
When a reset signal is input, a user reset that performs initialization by shifting to the user mode without passing through the security mode;
Reset management information for designating either one of
A computer chip for a gaming machine, wherein when a generation of an internal reset factor including a watchdog timer and an illegal address trap is identified, a system reset or a user reset is selected based on the reset management information.   2. The gaming machine computer chip according to claim 1, wherein after the security check is executed in the security mode, the gaming mode is switched to the user mode and a gaming process according to a predetermined user program is executed.   The game according to claim 1 or 2, wherein the reset management information is stored in advance in an initial setting area in the user program, and is read out from the initial setting area when occurrence of the internal reset factor is identified. Computer chip for machine.

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