| 摘要 |
PURPOSE:To increase the processing ability of system, by reducing the required time through simultaneous operation of the discs in existence and spare system, by one operation instruction from the existing system CPU to the disc control unit of existing system. CONSTITUTION:The duplex system is constituted with the CPU1 of existing system and CPU1' of spare system, disc control unit 2 of existing system, disc control unit 2' of spare system, magnetic disc memory unit 7 of existing system and magnetic disc memory unit 7' of spare system, and the respective control units 2, 2' are provided with the interface circuit section 3, operation control section 4, and control circuits 5, 6 of existing and spare system. Further, one operation insturction from CPU1 of existing system to the control unit 2 of existing system is analyzed with the control unit 2 and the system is constituted so that the write-in of instruction to the memory units 7, 7' via the control circuits 5, 6 and the readout of instruction from the memory units 7, 7' can be made, allowing to increase the processing ability of system. |
