JPS62178293A - Character display system for display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a display device such as a cathode ray tube (hereinafter referred to as CR'r) display device connected to a personal computer, a word processor, etc., which includes a predetermined number of digits. A method for displaying characters, symbols, etc. as multiple lines [Prior art] When using a personal computer as a word processor or using a dedicated word processor, when displaying characters on a CRT etc., conventionally 40 Digit ×
25-line characters are generally displayed using 80 columns x 25 lines, especially when characters such as kanji that must be displayed using minute dots are displayed using 40 columns x 2 lines.
Only a five-line display is used.

7t S: L As document creation functions have improved, the number of digits that can be printed by printers has gradually increased, making it possible to use larger paper sizes.
etc., it has become necessary to increase the number of digits of characters to be displayed, but due to the limits of display resolution of CRTs etc., it has become impossible to display the required number of digits at the same time; It is giving rise to shuo.

As a countermeasure for this, the contents of the text memory, which stores the data of the created document, are sequentially transferred to the video memory, which stores the display data in a format corresponding to the display situation, and the display contents are thereby updated. A method called a launch operation has been considered.

[Problem that the invention seeks to solve]

However, in the case of the re-ejection operation, the data transfer from the text memory to the video memory is sequential, resulting in a delay in response to the key operation, resulting in operational inconvenience.

[Means for solving problems]

In order to solve the above-mentioned problem, the present invention is constructed by the following means.

In other words, in a display device equipped with a video memo IJ that stores each character data 'indicating multiple lines of characters from a predetermined number of digits in correspondence with the display status of the display screen, character data with a number of digits greater than the predetermined number a sub-video memory for storing a plurality of lines of data; a means for transferring character data for a predetermined number of digits starting from a required digit in the sub-video memory to the video memory as a block across each line; Means for displaying the transferred content on the display screen is provided.

[Effect]

Therefore, if you specify the required digits in the sub-video memory, character data for a predetermined number of digits will be transferred to the video memory as a block, and display will be performed based on this content. Specify digit? By sequentially shifting, characters with a predetermined number of digits or more are displayed sequentially, and
Eri processing speed is improved for block transfer.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing embodiments.

The gi diagram is a block diagram of the circuit configuration, in which a processor C such as a microprocessor (CPU) 1 is connected to a display control unit (
In addition to giving commands to the DCT (hereinafter referred to as DCT) 2, character data indicating characters, symbols, etc. are directly transferred to the sub video memory (hereinafter referred to as SV
M) 3, and the contents thereof are transferred to the video memory (hereinafter referred to as VDM) 4 according to the display condition and stored in correspondence with the display condition, while the contents are read by the DCT 2 and displayed on the CRT. Send to circuit (hereinafter referred to as DPC) 5, C
RTK has become a field for displaying characters, symbols, etc.

FIG. 2 is a diagram showing the display surface of a CRT with various contents of VDM4.87M30. On the display surface 11, Eri characters 12 are displayed on multiple lines LO to L19 each consisting of a predetermined number of digits RO-R39. The VDM4 has display screen 1.
Each digit RvO to Rv3g of the character data D, each consisting of 4 bytes, corresponds to the display status of 1 and is addressed to ooo for each line.

~1000 bft is stored.

Note that each byte BO, a-BO, (1 to Bo4I) a
~B 040 d etc., 2 bytes are the character code and the other 2 bytes are the character code.
The byte is allocated to the attribute code, and one full-width character is displayed from the 4-byte VC.

In addition, the SVM3 has addresses 0OOOO to 1800, digits RO to R39 on the display surface 11, and digits RsO to R39.
The character data D of Rsn is stored in rows Lffl to Ll9, and each character data D is stored as B Oo a to B Oods B On;1 to
(B Ond, etc.), and initially, S
The character data D in the VM3 is transferred to the VDM4 line by line by digit RsO=R539, and the display screen 11 is displayed in accordance with this content.

Next, digits R51 to R84 of SVM3 are displayed on the display surface 11.
If you want to display 0 and then specify the required digit "1" using the t keyboard, which is omitted in Figure 1, the CPU1 will change from the digit RBt of SVM3 to R541).
In the ninth step, the character data D up to this point is transferred to the VDM 4 as a block for each line, and the content of the VDM 4 is updated.The display on the CRT in the DPC 3 according to this content
On the display surface 11, in each row LO to L19, the character 12 that had been displayed in the digit R1 is moved to the digit RO, and at the same time, the other characters are also shifted one digit to the left.
A new character is displayed in digit R39, and the characters are connected by arrows in FIG. 2, resulting in horizontal scrolling as a whole.

FIG. 3 is a flowchart showing the above-mentioned transfer status by the CPUI.
Character data for digits')S Transfer one character block from VM to VDM.
``Determine the address of column X in the next line J121'i''
After doing this, repeat steps 111 and after, and step 1
If 12 becomes YES, the transfer ends.

Therefore, the entire text of character data corresponding to the printing state is always stored in the SVM3 for lines LO to L19, and only the range to be displayed is transferred to the VDM4 as a block. - The display update status becomes faster, and by using a CRT or the like with a restricted number of display digits, it becomes possible to display any range of characters from a full text with a larger number of digits.

RrL, depending on the conditions, the same memory may be used for VDM4 and SVM3 and divided into respective applicable areas, and the number of digits and lines to be displayed may be determined according to the area of display surface 110 and display resolution. , this is my friend VDM
4 and the capacity of SVM3.

In addition, if the contents of SVM3 are made into multiple types of documents, and these are selected and transferred to VDM4, returning from the function explanation screen to the document creation screen, multi-window display, scale display to any part, etc. can be done quickly. Various modifications can be made as desired.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, by using a display surface with a limited number of next display digits, it is possible to display an arbitrary range from a full text having a number of digits greater than the number of display digits at high speed. This makes the operating situation more convenient and provides remarkable effects in displaying characters for various purposes.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, in which Fig. 1 is a block diagram of the circuit configuration, Fig. 2 is a diagram showing the relationship between the contents of each memory and the display screen, and Fig. 3 is a flowchart showing the transfer status of character data. It is. 1--CPU (processor), 2--Display control unit (DCT), 3--Sub video memory (SVM),
4---Video memory (VDM) 5...display circuit (DPC), 11...display surface, 12---characters,
RO~R39, Rvo~Rv 39, R8O~R8n・
...Digit, LO to L19...Line, D...Character data.

Claims (1)

[Claims] In a display device including a video memory that stores each character data representing a plurality of lines of characters each consisting of a predetermined number of digits in correspondence with the display status of a display surface, character data having a number of digits greater than the predetermined number are stored for the plurality of lines. a sub-video memory for storing, a means for transferring character data of the predetermined number of digits from a required digit of the sub-video memory to the video memory as a block across each row, and the transferred contents of the video memory. 1. A character display system for a display device, comprising: means for displaying on the display surface according to the above.