| 摘要 |
PURPOSE:To enhance the random property in address setting for reading out pattern data of a stop pattern after the scroll from a ROM, and to improve the random property of a pattern stop position after the scroll by providing an address setting means for performing a prescribed operation to an output of a random number generating means and reading out pattern data for a pattern display unit from the ROM. CONSTITUTION:When a hit ball discharged by operating a handle rolls on the panel surface and goes into a first kind start port, address data outputted from an address generating circuit 28 for designating pattern data read out of a ROM 13 for determining a display pattern on a pattern display unit is varies and outputted continuously by a function of this display controller set in advance and three lines of patterns arranged horizontally on the pattern display unit start scrolling in the vertical direction. That is, from the address generating circuit 28, a pattern address is outputted repeatedly and continuously at a prescribed speed. When a prescribed time elapses after the pattern starts scrolling, a count value of a counting circuit 26 is read out to an arithmetic circuit 27, and in the arithmetic circuit 27, with respect to the count value read out of the counting circuit 26, an operation is executed by three kinds of different operation expressions set in advance, respectively. |
