DATA TRANSFER SYSTEM

PURPOSE:To prevent a computer from stopping arithmetic processing during the transfer of data and to transfer data at real time without reducing the arithmetic processing capacity of the computer by independently executing the operation of the computer and that of a direct memory access(DMA) control circuit in the same computer unit. CONSTITUTION:In respective computer units A, B for executing data transfer, respective storage circuits 2a, 2b for temporarily storing transfer data are formed as multi-port circuits, and after processing data to be stored in the circuits 2a, 2b, data writing address buses 4a, 4b, data buses 5a, 5b, transfer data reading address buses 8a, 8b from the circuits 2a, 2b, and data buses 9a, 9b are respectively separated. Thereby the operation of the 1st and 2nd computers 1a, 1b are completely separated from the operation of the 1st and 2nd DMA control circuits 3a, 3b and the 1st and 2nd computers 1a, 1b can continue processing without stopping it even in the control of transfer.