Abstract: A main CPU in a data transmitting section applies a packet number recorded in a packet number memory to a block data when transmitting the latter, and increments and updates the packet number upon completion of the transmission. A sub-CPU in a data receiving section determines whether the packet number applied to the block data received is the updated number or not, in order to determine whether the data is a re-transmission of previous data or a transmission of new data. If the block data received is a re-transmission of previous data, the data received previously is discarded. If the block data received is new data, the data received previously is processed.

Abstract: A dice displaying apparatus for a computer game machine includes a trackball operable by each player. Rolling speeds of two dice are derived from an amount and direction of operation of the trackball. Rolling angles of the dice are also derived from the amount and direction of operation of the trackball, with slight angles derived from random numbers added thereto. Display positions for the respective dice are determined every predetermined intervals of time from the rolling speeds and rolling angles. Image patterns of varied phases of rolling dice corresponding to the rolling angles are presented in the respective display positions on CRT displays.