JPH02230315A - Character display device - Google Patents

Abstract

PURPOSE:To improve display performance by informing the timing developing data on a text VRAM in display VRAM and synthesizing the screen of respective software in accordance with the timing. CONSTITUTION:Text VRAM 11-1n store respective character code data in correspondence with (n) softwares which are simultaneously operated. Display VRAM 2 stores dot information displayed on a CRT screen. When a synthesis part 6 receives information on the timing developing character code data on respective text VRAM onto display VRAM 2 by a timing information part 5, the synthesis part 6 synthesizes data displayed on CRT 7 from position information on text VRAM and a position and a size on display VRAM, develops the dot information on the display VRAM 2, and data is displayed on CRT 7. Thus, display performance is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a character display device, and particularly to a function for displaying character data possessed by multiple software programs running simultaneously on a multi-window screen. [Prior Art] Conventionally, character display devices display characters by pattern-developing character code data in a single text VRAM onto a display VRAM using a single display circuit. [Problem to be solved by the invention] The conventional character display device described above is a single text VRAM.
By writing the character code in , the character array image is expanded to the display VRAM as it is, so in order to perform multi-window display, the position of the data to be displayed on the text VRAM, the position and size on the display VRAM It is necessary to perform complex data processing based on such information under software control, which also has the disadvantage of reducing display performance. [Means for Solving the Problems] The character display device of the present invention includes a plurality of text VRAMs corresponding to a plurality of software programs that operate simultaneously, and a text display device that is to be displayed on a CRT screen. Display VRA that retains dot information
M, means for holding the position on the text VRAM of the display block to be expanded on the display VRAM, means for holding the position and size on the display VRAM at which the display block is to be displayed, and the text The system includes means for notifying the timing for loading data on the VRAM onto the display VRAM, and means for composing screens of respective software and loading the display data onto the display VRAM according to the timing. [Example] Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. In the figure, texts VRAM II to 1n store character code data corresponding to n pieces of software that operate simultaneously. The display VRAM 2 stores dot information to be displayed on the CRT screen. When the display data synthesis section 6 receives a notification from the timing notification section 5 of the timing to expand the character code data on each text VRAM onto the display VRAM 2, the display data synthesis section 6 extracts the data to be displayed stored in the text VRAM information storage section 3. Text of VRAM
The data to be displayed on the CRT 7 is synthesized from the above position information and the position and size of the data to be displayed stored in the display VRAM information storage unit 4 on the display VRAM,
The dot information is expanded to display VRAM2. Display VR
The data developed on AM2 is displayed on CRT7. Figure 2 is an explanatory diagram showing an example of a case where one piece of software actually displays the kanji ``A''. In the figure, text VRAMs 21 and 22 are text VRAMs corresponding to software 1 and 2, respectively. Text VRAM information 2
3 contains text VRAM for each data to be displayed.
The display VRAM information 24 stores the position and size of each data to be displayed on the display VRAM, and the text VRAM 21
．． 22 code data are synthesized according to the text VRAM information 23 and the display VRAM information 24, and expanded to the display VRAM 25 as dot information for multi-window display. [Effects of the Invention] As explained above, the present invention has the effect of reducing data processing by software when developing a pattern from code data on a text VRAM to a display VRAM, and improving character display performance. There is.

Claims (1)

[Claims] A plurality of text VRAMs corresponding to multiple pieces of software running simultaneously, a display VRAM that holds dot information to be displayed on the CRT screen, and a position in the text VRAM of display blocks to be developed on the display VRAM. means for holding the position and size of the display block on the display VRAM at which the display block is to be displayed; means for notifying the timing at which data on the text VRAM is to be expanded to the display VRAM; A character display device comprising means for synthesizing software screens and developing display data on the display VRAM.