JPS6290725A - Crt display system - Google Patents

Abstract

PURPOSE:To smoothly and quickly perform a display corresponding to data to be displayed by only sending the data to a display device, by dividing the description on the screen of the CRT into a function block and variable block and storing control data trains for taking the correlation between functional codes and used variables. CONSTITUTION:A processor 21 in a display device 2 reads out fixed data corresponding to the screen of the device 2 from a data managing memory 26 and retrieves functional code trains containing no variable data only out of a screen description memory 25. Then the processor 21 develops the functional code trains in a video memory 22. While the processor 21 works as mentioned above, a CPU1 collects variable data to be displayed and transfers the data to the display device 2. Upon receiving the data trains, the processor 21 finds the address of the screen description memory 25 by referring to the data managing memory 26 and draws a picture in the picture memory 22 on the basis of the functional code read out from the memory 25 and actually received data. When display data are updated from the CPU1 thereafter, only data to be updated are transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a CRT display method that displays a predetermined screen on a CRT based on instructions from a host processor (host CPU).

[Conventional technology]

FIG. 5 is a block diagram showing a conventional CRT display system, and FIG. 6 is a flowchart for explaining its operation. Fifth
In the figure, 1 is the host CPU.

2 is a processor 21. A display device includes a video memory 22, a CRT controller 23, a CRT 24, etc., and 3 is a transmission line.

That is, the host CPU collects display data to the display device 2 (see Figure 6 ■), generates an order sequence for screen display (see Figure 6 ■), etc., and sends it to the display device via the transmission path 3. The order sequence is passed to the processor 21 in the processor 2 (see Figure 6). The processor 21 is
Interprets and executes the order sequence from host CPU1 (
(see Fig. 6 (■)), the display screen is expanded to the video memory 22 (see Fig. 6 (■)), and the CRT controller 23
The screen developed in the video memory 22 is displayed on the RT 24. However, in this conventional method, the host C
Since data collection processing A9 screen order string creation processing B2 screen order string sending processing C etc. must be performed in the PUI, a large load is placed on the host CPUI, and the amount of data to be transferred to the display device is large.
There was a drawback that it took a long time to display on the CRT.

On the other hand, the generation and transfer of the screen order sequence (processing B) shown in FIG.
, C)) In order to reduce the load on the CPU and increase the display speed, there is also known a type in which the screen order sequence is stored in advance on the display device side.

Figure 7 is a configuration diagram showing such a CRT display method, and Figure 8
The figure is a flowchart for explaining the operation.

In FIG. 7, the host CPUI is the display device 2.
static screen display command (see Figure 8 ■),
Collection of dynamic display data to be sent to the display device 2 (see Figure 8 ■), generation of a screen order for the dynamic display section (see Figure 8 ■), and display device 2 of the screen order via the transmission path 3 (see Figure 8 ■), etc., and the processor 21 transfers the information to the host CP.
In accordance with commands from the UI, the display of the screen portion in the state/vine is read out from the screen description memory 25, interpreted, expanded, and drawn in the video memory 22 (see Figure 8 (■)), and then the screen order of the dynamic display section is sent from the host CPU 1. The receiver takes it and similarly draws it to the video memory 22 (
(See Figure 8 ■). In addition, processing E and F in FIG.
Both are the same as the process E in FIG.

[Problem that the invention seeks to solve]

In this second method, the static screen is stored in advance on the display device side, and the part to be displayed dynamically is processed by the host CPU, thereby reducing the load on the host CPU and reducing the amount of data being transferred. Although it is possible to increase the speed by reducing the number of dynamic display units, this method still has the problem that as the number of dynamic display units increases, the load increases.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks and to provide a CRT display method that enables smooth and high-speed display by transmitting only the dynamic raw data from the host CPUI. do.

[Means and effects for solving the problem] The data description and the screen description function code part (for example, character display, linear display, etc.) in the three-screen description can be separated and described independently, and the screen can be written on the display device side. By providing an area (screen memory) for storing description function code strings and a data management area (data management memory) for associating the data description that defines the screen description with the screen memory described above, each data string can be stored in advance. By storing only the variable data (raw data) of the screen to be displayed from the host CPU, a CRT display method is provided that can be displayed independently by the display device.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a reference diagram for explaining screen description order, and FIG. 3 is a diagram explaining the relationship between screen description order, screen description memory, and data management memory. FIG. 4 is a flowchart for explaining processing operations in the host CPU and the processor in the display device.

As is clear from FIG. 1, this embodiment is characterized in that a data management memory 26 is provided. This data management memory 26 contains control information (characteristics of the data defined by the data description) for correlating the screen description function code section with the data required for display (indicated by the screen description definition data). (data indicating the number of data, etc.) and the storage address of the function code section that uses that data description)
It is for storing. In addition, regarding the screen description method, conventionally the function code FMC for displaying characters and the data string to be displayed (character string 'ABCDEF' in Figure 2) are written in one description as shown in Figure 2 (A). In contrast, in this invention, the screen description function section and the display data section, as shown in FIG. By dividing the data into definitions (in the case of variables, the number of data), the screen description and the data to be actually displayed are distinguished, and their relationship with each other is reduced. FIG. 3 shows how the screen description order (screen display order) shown in FIG. 2(B) is stored in the screen memory 25 and data management memory 26. The screen description data strings are each stored in the screen memory and data management memory 26 in units of screen lights (serial numbers assigned to each screen to manage the screens to be displayed), and the screen memory 25 is stored with function codes 15 in the order in which they are described. and 1D16 (type) of the display data variable are stored, and the data management memory 26 stores the attribute 17 (number of characters) of the defined variable and the function code in which the defined variable is used in the screen memory 25. Address 18(n) is stored.

FIG. 4 shows the flow of processing in the embodiment. In the same figure, the host CPUI performs a display screen startup process (see FIG. 4 (2)) on the display device 2 (sending a display command specifying screen reception). The processor 21 in the display device 2 uses this command to control the data management memory 2.
At the same time, the fixed data corresponding to the screen is read out from 6, and only the function code string that does not include variable data is searched from the screen description memory 25 for the corresponding screen light, and expanded to the video memory 22 (static screen display; Fig. 4 ■Reference). During this time, the host CPU collects variable data (for example, character strings and numerical data) to be displayed on the display.
It is transferred to [variable iD x variable data]. (Guinamisoku data transfer; see Figure 4 ■) When the processor 21 in the display device 2 receives this data string, it refers to the data management memory 26 based on the variable iD and uses the corresponding variable. The address of the screen memory 25 where the function code is stored is obtained (descriptive data search; see Figure 4 ■), and based on the function code read from this memory and the data actually received, the address is stored in the video memory 22. Draw (Guinamisoku data display; see Figure 4 ■). From then on,
When updating display data from the host CPUI, only the data to be updated is sent (processing B).

Execution of process C), display is automatically performed on the display device 2 side (processor 21 executes process E).

Perform processing F. ).

〔Effect of the invention〕

According to this invention, a screen description is divided into a function block and a variable block, and an area for storing the description as a function coder used variable iD column on the CRT display device side, and a correlation between the function code and the used variable are obtained. By creating an area to store control data strings for the control data and storing them in advance, the display device searches for the double-head area and displays it automatically in response to commands from the host. By reducing screen display processing and simply sending only the data to be displayed to the display device, it is possible to smoothly and quickly display the data.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a reference diagram for explaining screen description order, and FIG. 3 is a diagram explaining the relationship between screen description order, screen description memory, and data management memory. 4 is a flowchart for explaining the processing operations in the host CPU and the processor in the display device, FIG. 5 is a block diagram showing a conventional example of a CRT display system, and FIG. 6 explains the operation. FIG. 7 is a block diagram showing another conventional example of a CRT display method, and FIG. 8 is a flow chart for explaining its operation. Code explanation 1...Host CPU, 2...Display device, 2
1... Processor, 22... Video memory, 23.
...CRT controller, 24...CRT, 25...
・Screen description memory, 26...Data management memory, 3.
...Transmission path, 15... Display function code, 16... ID of display data variable (order for data display). Agent Patent Attorney Akio Namiki Agent Patent Attorney Kiyoshi Matsuzaki Ill Figure 1112 Figure/-/7 Otsu HR-Display Setup Fee n. + 45th! ! Figure 55iiiM 6 [,1,2)-CρU]

Claims (1)

[Scope of Claims] A CRT display method that displays a predetermined display on a CRT based on instructions from a host processor, the CRT display method comprising: a first display system that stores a plurality of screen display orders for forming each screen to be displayed; and a second memory for storing data display orders regarding fixed data corresponding to each screen and variable data corresponding to each screen, and when receiving a screen type designation from a higher-level processor, the second memory stores data display orders for fixed data corresponding to each screen and variable data corresponding to each screen. retrieves and displays the corresponding screen display order and the fixed data from the second memory, and when variable data is received from the host processor, reads the screen display order corresponding to the data display order. ,
A CRT display system characterized by displaying variable data on a predetermined screen.