| 摘要 |
PURPOSE:To decrease a system bus load by realizing data transferring with issuing a writing command only in one time at the time of writing data to an input and output device constructing multiplexing constitution. CONSTITUTION:When the activation of the command from a central processing unit 10 is executed, a file adapter 40 sets the same command to be designated by a command part 22 of a main storage device 20 to a device control register 44 of an input and output control device 30 to be set to a multiplexing operating mode according to the information of a mode register 43. The same command is issued to the device 30 and the data transferring of necessary data is executed through a data buffer means 45 between the device 20 and the device 30. Thus, by one time of the activation of the command from the device 10, the issuing of the same command can be realized to the device 30 constructing the multiplexing constitution. |
