| 摘要 |
PURPOSE:To change/delete protecting information of a memory by an external operating means and to guarantee the write protection to a file, by providing a control section performing write control to a disc file by the protecting information in a read/write memory and the operating state of plural computers. CONSTITUTION:CPU100A, CU100B of duplex computers are respectively connected to an adaptor 206 of a disc access controller 200. The controller 200 consists of a control section 201, a disc driving section 202, an ROM 203 and an RAM 204. A disc file 300 is connected to the driving section 202, the operating state of the CPU100A, 100B is transmitted to the control section 201 via signal lines 400A, 400B and the protecting information of the RAM 204 from an input/output section 205 as an external operating means is inputted to the control section 201. Then, the control section 201 controls the driving section 202 depending on the protecting information from the input/output section 205 and the operating state of the CPU 100A, 100B to guarantee the protection of write information from the RAM 204 to the file 300. |
