| 摘要 |
PURPOSE:To provide an UNDO processing system in a data file processor capable of confirming (previewing) the result of UNDO execution before executing an UNDO operation instruction. CONSTITUTION:This system is provided with an UNDO preview display means 12 for displaying the contents of a latest data file part 42 at an information display part 2 based on one of the data file editing information of an editing information buffer part 43 and the latest data file part 42, emphasis-displaying display contents when the contents of the data file editing information are not executed at the information display part 2, previewing the result of the UNDO execution and letting an operator recognize it and an UNDO execution means 15 for performing processings for thus returning the latest data file part 42 to a previous state when the contents of the data file editing are not executed, returning display at the information display part 2 to a state display before the data file editing is performed and eliminating or canceling the data file editing information stored in the editing information buffer part 43. |
