| 摘要 |
PROBLEM TO BE SOLVED: To select a detail of a screen naturally by erasing a 1st screen from a 1st screen memory and displaying only the 2nd screen. SOLUTION: A screen A is written in a screen memory 4c to display it onto a CRT 6. A screen B is written in a screen memory 4d to e displayed on the CRT 6 and the write to each of the screen memories 4c, 4d is executed by a CPU circuit 2. That is, for example, the screen A is written in the screen memory 4c at first and displayed on the CRT 6. Then the screen B is written in the screen memory 4d and the screens A, B are displayed on the CRT 6 while being overlapped with each other. Then the screen A is deleted from the screen memory 4c to display only the screen B onto the CRT 6. |
