| 摘要 |
PURPOSE:To provide a file recovery processing system without imposing a burdon on end users by preserving stackwise an arithmetic object on a display picture, an operation of which is not carried out yet when its operation has been carried out for the arithmetic object. CONSTITUTION:When data is inputted form an input device 3 to a displayed on a CRT 1, its data is posted to a display picture register RG 2 through an arithmetic processor 6 and appear on the display screen. If an operation command is inputted form the input device 3 and an execution key is pressed, the processor 6 sends a signal to a picture stack controller 8 and gives directions so that a copy of RG 2 is stored in a picture stack storing device 4 and its storing position address are stored in a picture storing address RG 5. In case where a conversational display picture on the CRT 1 is required to be reverted, once a before-command is inputted, the stack controller 8 reads out an earlier picture stack by one picture displaying at a position address of RG 5 from the device 4 to the RG 2 and will display the CRT 1. |
