| 摘要 |
<p>PURPOSE:To improve the using efficiency of a screen by checking a defined field for data under display and repeating this check until the continuous length of the non-preserved data is equal to the field length needed for display of a back-up message. CONSTITUTION:A CPU 1 receives a display command from a keyboard 6 via an interface 7 and checks the attribute or the before-after logic relation of the input subject data displayed at the cursor position on a CRT 5. Thus the CPU 1 selects an operation back-up message to be displayed on the CRT 5. Then the defined information is read out of the head field in a picture memory 3 and the presence of the data preserved in a reading field is checked to obtain an idle field. If the length of the idle field is smaller than the length needed for display of said back-up message, the following fields are checked repetitively until an idle field having the sufficient length is obtained. By this method a fixed field for operation back-up message is eliminated and the using efficiency of a screen is improved.</p> |
