Abstract: A parallel digital computer with which real-time simulations can be performed. A multiplicity of elemental computers are joined in a parallel architecture through a master computer and shared memory system. Real-time operation of the elemental computers and master computer are time interleaved without overlap. Input data entering each elemental computer is processed according to the designated function during one time segment, succeeded by a master computer operating time segment during which the resultant elemental computer data is selectively transferred to the appropriate elemental computers for the next processing sequence. A real-time clock synchronizes the alternating time segments, allocating sufficient time for the processing performed by the elemental computer and the subsequent data transfer steps. Integration, unlike addition, subtraction and the numerous other arithmetic and logic functions, is performed only once per frame time.