Abstract: A pseudo-three-dimensional image displaying apparatus displays a pseudo-three-dimensional image, as viewed from a given viewpoint, of a moving object whose three-dimensional coordinates and rotational angles have been established. The pseudo-three-dimensional image displaying apparatus has a memory for storing a history of coordinates and/or rotation angles of the moving object, a viewpoint calculator for determining coordinates and/or rotation angles of the viewpoint based on the history, stored in the memory, of coordinates and/or rotation angles of the moving object, and a data calculator for generating and displaying an image as viewed from the viewpoint at the coordinates and/or rotation angles determined by the viewpoint calculator.

Abstract: When one of general registers has a register number indicated by a renewal instruction and should be renewed to a result of execution by an arithmetic unit of an execution time measured in terms of machine cycles for the renewal instruction, a register (91) holds the register number as a held number. From a machine cycle number representative of the execution time, a counter (95) is counted down in each machine cycle to successively provide decreasing numbers. Coincidence circuits (97, 98) find coincidence between the held number and two register numbers indicated by a current instruction which is preceded by the renewal instruction and for which two operands should be read from the general registers of the two register numbers. When the coincidence is found, execution of the current instruction is suspended. Otherwise, the operands are read. The suspension is released when the counter is counted down to zero.