JPS63197990A - Duplication display system for character display device - 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] [Summary] The present invention provides a character display device that displays characters, etc. on a screen according to attribute codes using a screen memory in which a field attribute code is provided before a series of character symbol codes. When displaying multiple display screens, identify the screen at the field attribute code position, memorize the attribute code such as characters between the field attribute code positions on both sides of the screen boundary, and read this to determine the correct attribute when the screen overlaps. It was designed to give

[Industrial application field]

The present invention relates to an overlapping display method for a character display device that displays multiple screens overlappingly using a screen memory in which a field attribute code is provided in front of a series of character symbol codes. A method of repeatedly displaying a single or multiple small screens for reference on a screen is often used. Bitmap memories are used exclusively for such applications. In other words, characters in bitmap memory,
When storing an image such as a symbol, the attributes that distinguish color, brightness, font, etc. are displayed in each bit itself, so if a small screen overlaps the original screen, it is displayed with the bits of the original screen up to the boundary. However, on a small screen, it is easy to display multiple bits of this screen without any problem.

In contrast, without using bitmap memory in the screen buffer for displaying on the display, a specific change table to be applied to the series of character symbol code strings included in each line of character symbols is created before the series of character symbol code strings included in each line of character symbols. For displaying characters, etc., this is a faster and more efficient display method than the method using bitmap memory.

[Problem that the invention seeks to solve]

FIG. 3(α) shows an example of a conventional screen buffer of this type. For simplicity, the character code is represented by 1 byte, and it is a series of characters 31 to 6n, and a 3-byte attribute code is placed at the beginning of the character code to indicate attribute 2 such as color, brightness, kana, alphanumeric characters, etc., then 1 The attribute of the second ■ is applied up to 3% of the characters before the attribute of the second ■.

That is, since the scope of the attribute is the subsequent string of characters, this effect must be taken into consideration when overlapping screens.

In FIG. 6, when the reference small screen 111 is overlapped with the original screen 11, the remaining screen is set to 110. When the data indicating field attributes is indicated by ■, ■, ...■ on the original screen 11, as explained in the same figure (G), ■～■, ■～■, ■～■
, ■ for characters between ■ and ■, and between ■ and ■, respectively.

The display specified by the field attributes ■, ■, ■, ■ is performed. When screen 111 is displayed overlappingly on screen 11, screen 11! Inside, new attributes and character arrangement are set. Therefore, the character ring ＠~θ in the remaining screen 11G, which was controlled by the attribute ■ deleted from the screen 111, is now the screen 11 in front of ■! will be controlled by the attributes within. As a result, attributes may change. Therefore, it is necessary to search for the attribute ■ of the original screen 11 to the left from the boundary between ■ and the screen 111. Furthermore, if an attribute is not found in the same row as in θ, the rows above must be searched in order. In this way, when screens overlap in this type of screen memory, it is necessary to check the influence of the attributes of the previous screen and prevent the attributes of the previous screen from being changed. The disadvantage is that a change program must be prepared and it takes time.

Figure (c) is a configuration diagram of the conventional example, which is connected to addresses under the control of crtylo and data buses 161 and 162, respectively, and codes such as attributes and characters developed in the screen buffer 11 mentioned above. Display device (DPL) 15 based on
will be displayed. A fixed program of operation is stored in the ROM 12, and an original screen program for the overlapping portion is stored and stored in the RAM 13 in addition to the heavy screen program. Further, the I10 register 14 is used for controlling the entire display screen, outputting to a printer, and the like.

If screens are duplicated due to this configuration,
As mentioned above, there is a problem in that it takes time to create and execute a change program in the RAM 1S.

An object of the present invention is to provide a duplicate display method for a character display device that uses a screen memory in which a field attribute code is provided in front of a series of character symbol codes, and that can display predetermined changes quickly and without errors on duplicate screens. It is about providing.

Means for Solving Problem C] In order to achieve the above object, in the present invention, in a character display device using a screen memory in which a field attribute code is provided before a series of character symbol codes, When retrieving a screen for reference, a field attribute buffer is provided which identifies the screen at the field attribute code position and indicates the attribute code such as a character between the field attribute code positions on both sides of the screen boundary.

[For production]

FIG. 1 is an explanatory diagram of the principle of the present invention, and is an explanatory diagram of an example of a field attribute control buffer which is a main part of the present invention.

That is, a buffer for controlling the display of attributes such as characters is provided corresponding to the screen memory 11 shown in FIG. 3(6). At the time of duplication, it is not the screen 21 violet corresponding to the duplicated screen 111 that is affected, but the screen 21 . corresponding to the residual screen 11o. Therefore, unnecessary parts are omitted from the screen 211.

That is, among the attribute codes ■ to ■, ■, ■, ■, ■ are screen 11. ■ is a duplicate screen 11! Therefore, in order to identify them, the attribute codes ■, ■, ■, ■ are shown as ■, ■, ■, ■ with 0 added, and ■ is shown as ■ with 1 added. Then, attribute codes to be applied are given to characters between these attribute codes.

For example, an attribute code ■ is given to character strings other than the screen 211 between ■ and ■. Also, an attribute code ■ is given to character strings other than those on the screen 211 between ■ and ■. If you prepare such an attribute code buffer and read and display the boundary information of the duplicate screen and the attributes of this attribute code buffer for the character string following the attribute code when displaying duplicates, the correct attribute will be displayed. can be displayed at high speed.

〔Example〕

FIG. 2 is an explanatory diagram of the configuration of an embodiment of the present invention.

In the same figure, the difference from the conventional example in FIG. 3(c) is that R
The field attribute control buffer 21 shown in FIG. 1 is provided in a part of the AM 13.

The original screen data stored in RAM 13 is transferred to screen buffer 1.
1 and then displayed on the display device (DPL) 15, and when displaying the small screen data similarly stored in the RAM 13 on that screen, the display proceeds while referring to this field attribute control buffer 21. .

That is, by reading out the screen memory 11, the file /l/
)' When the attribute codes ■, ■, .

Although FIG. 1 shows the case where one small screen is overlapped with the original screen, it is also possible to overlap a plurality of small screens, or to further overlap on top of the overlapping screen.

〔Effect of the invention〕

As explained above, according to the present invention, in a character display device that uses a screen memory that stores a character string with a field attribute code at the beginning, it is possible to solve the problem of overlapping display on multiple screens, which has been extremely troublesome in the past. By providing a field attribute control buffer, even if field attribute codes are hidden by duplicate screens, correct attributes can be specified for characters near boundaries. In addition, there is no need to search as in the conventional case, and it is sufficient to simply read out the data, thus enabling high-speed processing.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is an explanatory diagram of the configuration of an embodiment of the present invention, and Figs. 3 (cL) to (6) are explanatory diagrams of a conventional example. In the figure, 10 is the CPU, 11 is the screen buffer, 11o is the original screen, 111 is the duplicate screen, 11o is the remaining screen, 12 is the ROM, 13 is the RAM, 14 is the processing register, 161.162 is the address, data bus, 2
1 indicates a field attribute control buffer.

Claims (1)

[Scope of Claims] A screen memory is provided for arranging and storing a field attribute code specifying a specific change display at the beginning of a code string of a series of characters and symbols (hereinafter referred to as characters, etc.) displayed on a display screen. , in a character display device that displays a code string such as a series of characters read from the screen memory specified by field attributes, when a single or multiple reference screens overlap with the display screen, both of the overlapping screens A code to identify the screen is given to the field attribute code position above, and a field attribute control buffer is provided to indicate the attribute code of the character position between the field attribute positions on both sides of the screen boundary. An overlapping display method for a character display device characterized by displaying a predetermined attribute on overlapping screens without affecting the attributes.