| 摘要 |
PURPOSE:To execute a diagnosis or the like of main storage device except existing machines, by designating a main storage device to be read in, in case of reading the data from main storage device in which the same data are simultaneously written in the same address. CONSTITUTION:The written-in data are simultaneously stored in the same address designated by the address information other than the most significant bit of the storage section of both the main storage devices MM0 and MM1. On the other hand, the read out data is read, out from only the storage section in the main storage device MM0 if the most significant bit of the address information is 0 and from only the main storage device if the bit is 1. Thus, a central control device CC0 can read in data from the main storage device MM0 or MM1 by instructing the most significant bit of the address information to logical 1 or 0. |
