JPS6452493A - Pinball machine - Google Patents

Abstract

PURPOSE: To prevent the possibility of being controlled to the same timing by experiential perception by updating an address of a random number table for specifying a random number in synchronization with a timing signal output from a timing signal output means, and changing the output cycle of a timing signal according to the disturbance physical condition. CONSTITUTION: A random number table 31 is formed on a ROM 3 connected to a micro-computer 1, a timing signal output by a timing signal generating circuit 18 is input to a RST1 terminal of the micro-computer 1, and the cycle of a timing signal output from the circuit 18 is changed according to the temperature change of environment. A random number for determining a success mode is determined by setting the value of a random number memory 81 when a ball enters a specified prize winning port in a definite memory 82. The random number fixed at this time is determined by a random number changing in synchronization with a timing signal, the cycle of which varies with the temperature of environment, so that even if a stop switch 20 is pushed with constant regularity, it is impossible to intentionally set a definite random number to a specified value.