| 摘要 |
<p>PURPOSE:To prevent the destruction of displaying data by assigning to store the displaying data outputted by a starting program into the first screen buffer when it is discriminated that the starting program has the instruction to write the displaying data into the first screen buffer. CONSTITUTION:When the program of the occupying attribute executes, the program of the occupying attribute occupies a screen buffer SB1, and at such a time, even when the request of the execution of the program occupied by a work memory WRKM or the displaying change-over occurs, the data are displayed by a screen buffer SB2. Only when the displaying data of the program of the occupying attribute are displayed, the screen buffer SB1 is selected and displayed by a displaying selector 8. Thus, when the program is executed which is not the occupying attribute, the displaying is always controlled by a window control part 4 so as to use the screen buffer SB1, and when the program of the occupying attribute is executed, the displaying data are stored into the screen buffer SB1 without fail, and the displaying data of other program are not destructed.</p> |
