JPS61296389A - 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] [Summary] A screen configuration determination memory that stores the character display order on the screen and a display memory that stores character codes are provided, and the display memory is configured based on the contents of the screen configuration determination memory. A configuration is shown in which split screen display is performed by reading out the contents.

[Industrial application field]

The present invention relates to a display device that performs sequential scanning, such as a rask scan type display.

[Conventional technology]

2. Description of the Related Art Rusk scan type displays have been commonly used as character display devices for computers.

An example of the circuit configuration of this Rusk scan type display is shown in the second example.
As shown in the figure. In FIG. 2, 1 is a bus leading to a CPU (not shown), 2 is a display memory that stores character codes, 3 is a counter that generates an address for the display memory, 4 is a receiver for address signals from the bus, and 5 is a bus 6 is a video signal generator for generating a character pattern and converting it into a video signal; 7 is a multiplexer; and 8 is a CRT display.

Character attribute information such as character codes and angle lines to be displayed from the CPU is sent to bus 1. It passes through the driver/receiver 5 and is stored in the display memory 2.

The address of the display memory 2 at this time is specified through the bus 1, receiver 4, and multiplexer 7.

The counter 3 generates a synchronization signal necessary for display on the CRT display 8 and an address signal for the display memory 2, and the contents of the display memory 2 accessed by the address signal, that is, character codes, etc., are transferred to the video signal generator 8. Here, it becomes a video signal showing patterns such as characters, and is transferred to a CRT.
The data is input to the display 8 and the pattern is displayed on the screen.

In the conventional system, there is a one-to-one correspondence between the display memory and the display screen. Figure 3 shows this pattern. Figure 3 (al is the content of the display memory, Figure 3 (b)
) indicates a display screen displayed on the CRT tube surface. As shown in this figure, the display memory 2 stores the first
The character codes of the character groups are packed in order starting from the first column of the row. The CPU calculates the address of the display memory from the position of the character to be displayed, and writes a character code indicating the character type into the display memory.

[Problem that the invention seeks to solve]

In recent years, it has become common for computers to process two or more jobs and display the two or more processing contents on a single display device in a divided screen.

The state of this processing is shown in FIG. In the conventional method, the CPU
creates display data A and display data B according to the processing content, and performs a process of combining them on a display memory when displaying them on a display device.

This processing is very complicated and increases the load on the CPU.

Therefore, we simplified this complicated screen splitting process and
It is desired to reduce the burden on

[Means for solving problems]

In order to solve the above problems, the display device according to the present invention includes a counter (3) that counts according to the scanning of the display device, and an output of the counter (3) that is accessed and stores the character display order on the screen. a first memory (9); a second memory (2) that is accessed by the output of the first memory (9) and stores a character code; It is characterized in that it is provided with means (6) for converting into figures such as, etc., and performs screen split display based on the contents of the first memory (9).

[Effect]

In the present invention, a screen configuration determination memory that stores the character display order on the screen is provided separately from a display memory that stores character codes, and reading from the display memory is performed based on the contents of the screen configuration determination memory. I'm trying to control it. This allows the CPU to change the display memory without being aware of the split screen.

〔Example〕

FIG. 1 is a block diagram of one embodiment according to the present invention,
Components with the same numbers as those in FIG. 2 above have the same names. In FIG. 1, 9 is a memory for determining the screen configuration; 10 is a memory for determining the screen configuration;
is a driver/receiver, and 11 is a multiplexer.

The difference from the conventional method shown in FIG. 2 is that a memory 9 is provided to determine the screen configuration, a driver/receiver 10 is used to transmit and receive data between the lotus 1 and the memory 9, and a multiplexer is used to specify the address of the memory 9. 11 was established.

Next, examples of the present invention will be described. It is a counter that calculates the number of cycles and displays information on the beam position. Beam position information from counter 3 is provided to memory 9 through multiplexer 11. The memory 9 generates an address of the display memory 2 in which the character code to be currently displayed is stored based on the beam position information of the counter 3.

This is what I stored. This will be discussed later. Display memory 2 receives the address from memory 9 through multiplexer 7 and generates a character code to be displayed. This character code is converted into a character pattern by the video signal generator 6 and displayed on the screen of the CRT.

Next, address data stored in the memory 9 will be explained. -For example, as shown in Figure 5, the display screen is
Characters are displayed in column n rows, and A is stored in display memory 2.
Assuming that the character codes from address A+n-1 to ao""n-1 are stored sequentially, the characters a0 to a, -1 from the first row and first column of the D4 display screen are stored sequentially. If you want to display them in order, do as shown below.

(1) The address of the memory 9 for the character display position in the first row and first column is address (k-1) Store.

(2) Similarly, for the character display position in the second row and second column, address A+1 of the display memory 2 is stored at address (k-1)Xn+1.

(3) Count amplify sequentially up to address kxn-1 and store up to A+n-1.

By the above procedure, it is possible to display one row from the first row and the first column to the nth row and the nth column. The same applies to other lines. At this time, the ao"'a stored in the display memory 2
The character code n-1 may be stored at any address in the display memory 2 as long as the value of data A stored in the memory 9 is changed. Moreover, even if the contents of the display memory are not changed, by changing the contents of the memory 9, the image can be displayed at any position on the screen. Due to these, in the present invention, when displaying a split screen as shown in FIG. It can be easily displayed by changing the . FIG. 6 shows an example of screen division. In this figure, a□”an is split screen A.
The characters, data b, and -b are the character data of split screen B. a.

The character data of ~an is from address A in the display memory.
-b, are assumed to have been stored sequentially from address B onwards in the display memory. At this time, for the first row, when displaying split screen A from the first column to the first column, split screen B from the i+1st column to the βth column, and split screen B from the 1+1st column to the nth column, As in the case of FIG. 5, the contents of the memory 9 store A-A+i-1 from addresses (k-1)xn to (k-1)xn+i-1, and from addresses (k-1)Xn+i to (k-1) B-B+j to address Xn+i+ff-1
2-1 is stored, and (k-1)xn+i ~ address 1 ~
The storage of A+i+ff-A+n-1 up to address -1 can be managed in a separate area on the display memory, and the screen configuration is managed by memory 9, so the CPU is not aware of the split screen as in the conventional system. You can change the display memory without having to do so. Furthermore, according to this method, it is possible to divide the screen not only into two, but also into multiple divisions.

〔Effect of the invention〕

According to the present invention, screen division processing can be performed without placing a large load on the CPU, and system performance can be improved.

[Brief explanation of drawings]

Fig. 1 is a block diagram of one embodiment of the present invention, Fig. 2 is a diagram showing an example of the circuit configuration of a conventional display, Fig. 3 is a diagram showing a conventional screen display, and Fig. 4 is a diagram of a screen display using a split screen. 1
Figures 5 and 6 showing examples are diagrams showing the correspondence between memory and screen. In FIG. 1, 2 is a display memory, 3 is a counter, and 6 is a display memory.
is a video signal generator, 7 is a multiplexer, and 8 is a CRT.
A display, 9 a memory for determining screen configuration, and 11 a multiplexer. This invention-31 Ibaran Ffi+'s professional distribution pty system, 1 team, 12 yuan, 1 forgetting, 2 criminals, Shiba, tl) Bag-face port, begging, 3 areas of record [ 7□')'lph volume〕
[For rice nails y [S2/inner emmi] t to show the correspondence and luster of the 7-ri Otsu side 5th [Picture guide]

Claims (1)

[Claims] A counter that counts in accordance with the scanning of a display device (
3), a first memory (9) that is accessed by the output of the counter (3) and stores the character display order on the screen, and a first memory (9) that is accessed by the output of the first memory (9) and stores the character code. 2 memory (2) and means (6) for converting the output from the second memory (2) into figures such as character patterns, A display device characterized by performing split display.