| 摘要 |
<p>PURPOSE:To enable to perform the write-in of optional character without error easily, by selecting only the light pen signal plotting on the dots of CRT screen displaying the underlay, and reading in the dot pattern of optional character. CONSTITUTION:The optional character input section A is provided with the address control unit so that an arbitrary pattern can be written in the CRT screen with the light pen 3, refresh memory 5, CRT drive circuit 6 and CRT unit 7. Further, while plotting the dot on the screen with the light pen 3, the required optional character is written on the display screen, the signal of the pen 3 plotting on the dot only is selected to read in the dot patern data of optional character. Thus, the write-in of an optional character can easily be made without error.</p> |
