| 摘要 |
PURPOSE:To enhance the access processing function to the input/output device as well as to prevent the extreme lowering of the function of the mass storage facilities caused by the fault of the access system. CONSTITUTION:The information is read out from mass storage facility 3 and stored in one of disc back memory units such as 11-0. Then central information device 2 gives an access to memory unit 11-0 to process it. In this case, the double structure is applied to disc back control unit 8-0 and 8-1. Thus in case the access system cannot be used via bus line 9-1 due to occurrence of some fault, other bus line 9-1 is used to secure the access. And disc back memory unit 11 and 12 are formed into the crosscall structure. |
