JPH0426490B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is directed to a high-level processor (host CPU).
This invention relates to a CRT display method that displays a predetermined screen on a CRT based on instructions from the CRT.

[Conventional technology]

Figure 5 is a configuration diagram showing the conventional CRT display method.
FIG. 6 is a flowchart for explaining the operation. In Figure 5, 1 is the host CPU,
2 is a display device consisting of a processor 21, a video memory 2, a CRT controller 23, a CRT 24, etc., and 3 is a transmission line.

That is, the host CPU 1 collects display data to the display device 2 (see Figure 6) and generates an order sequence for screen display (see Figure 6).
etc., and passes the order sequence to the processor 21 in the display device 2 via the transmission path 3 (see FIG. 6). Processor 21 is a host
Interprets and executes the order sequence from the CPU 1 (see Figure 6), develops the display screen in the video memory 22 (see Figure 6), and CRT controller 23
The screen developed in the video memory 22 is displayed on the CRT 24 via the CRT 24. However, in such a conventional method, the host CPU 1 must perform data collection processing A, screen order string creation processing B, screen order string sending processing C, etc., which places a large load on the host CPU 1, and
Since the amount of data transferred to the display device was large, the disadvantage was that it took a long time to display on the CRT.

On the other hand, in order to reduce the load on the host CPU 1 that generates and transfers the screen order sequence (processing B and C) shown in Figure 6, and to increase the display speed, the screen order sequence is stored in the display device in advance. There are also known types that allow you to keep them in place.

FIG. 7 is a block diagram showing such a CRT display method, and FIG. 8 is a flowchart for explaining its operation. In Figure 7, host CPU1
is a static screen display command to the display device 2 (see Fig. 8), and the display device 2
collection of dynamic display data to be sent to the display device (see Figure 8), generation of a screen order for the dynamic display section (see Figure 8), and transfer of the screen order to the display device 2 via the transmission line 3 (see Figure 8). (see Figure 8), etc., and the processor 21
In response to a command from the host CPU 1, the static reads the display of the screen portion from the screen description memory 25, interprets it, expands it, and draws it in the video memory 22 (see Figure 8), and then reads the screen order of the dynamic display section from the host CPU 1. When you receive the
Similarly, it is drawn in the video memory 22 (8th
(see figure). Note that processes E and F in FIG. 8 are both the same as processes D and E in FIG. 6.

[Problem that the invention seeks to solve]

In this second method, the static screen is stored in advance in the display device, and the part to be displayed dynamically is processed by the host CPU 1.
Although it is possible to increase the speed by reducing the load on the host CPU 1 and the amount of transferred data, this method still has the problem that the load increases as the number of dynamic display sections increases.

Therefore, the present invention eliminates the above-mentioned drawbacks and transmits only the dynamic raw data from the host CPU 1 for display.
The purpose is to provide a CRT display method that allows smooth and high-speed display.

[Means and actions for solving problems]

An area (screen memory) in which the data description and screen description function code part (for example, character display, linear display, etc.) in screen description can be separated and described independently, and where the screen description function code string is stored on the display device side. A data management area (data management memory) is provided for associating the data description that defines the screen description with the screen memory described above.Each data string is stored in this area in advance, and the screen to be displayed from the host CPU is stored. A CRT that can be displayed independently on a display device by sending only variable data (raw data)
It provides a display method.

〔Example〕

Fig. 1 is a configuration diagram showing an embodiment of this invention;
The figure is a reference diagram for explaining the screen description order, Figure 3 is a reference diagram for explaining the relationship between the screen description order, screen description memory, and data management memory, and Figure 4 is a reference diagram for explaining the relationship between the screen description order, screen description memory, and data management memory. 3 is a flowchart for explaining processing operations in FIG.

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) were written in one description as shown in Figure 2A. However, in this invention, the screen description function section and the display data section, that is, the second
As shown in Figure B, [Function code for displaying characters]
FMC + specification of data to be displayed CHR and definition of data to be displayed (number of data in the case of variables)]
By dividing the screen into two, 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. 2B is stored in the screen memory 25 and data management memory 26. Each screen description data string is
The function codes 15 and display data variables are stored in the screen memory and data management memory 26 in units of numbers (serial numbers assigned to each screen to manage the screen to be displayed), and the function codes 15 and display data variables are stored in the screen memory 25 in the order in which they are written. iD16 (type) is stored in the data management memory 26, and the address 18 in the screen memory 25 stores the attribute 17 (number of characters) of the defined variable and the function code in which the defined variable is used.
(n) is stored.

FIG. 4 shows the flow of processing in the embodiment. In the figure, the host CPU 1 performs display screen startup processing for the display device 2 (see Figure 4).
(Issuing a display command that specifies the screen number). Based on this command, the processor 21 in the display device 2 reads fixed data corresponding to the screen from the data management memory 26, and searches only the function code string that does not include variable data in the screen description memory 25 of the corresponding screen number. and expands it to the video memory 22 (status screen display; 4th
(see figure). During this time, the host CPU 1 collects variable data (for example, character strings and numerical data) to be displayed on the display (dynamic data collection; see Figure 4), and sends it to the display device 2 [Variable iD +
It is transferred in the form of "variable data". (Dynamic 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 stores the function code using the relevant variable. The address of the screen memory 25 where the data is being displayed is determined (descriptive data search; see Figure 4), and drawing is performed in the video memory 22 based on the function code read from this memory and the data actually received (dynamic data search). Display; see Figure 4). From now on, when updating display data from host CPU1,
By transmitting only the data to be updated (execution of processing B and processing C), display is automatically performed on the display device 2 side (processor 21 performs processing E and processing F).

〔Effect of the invention〕

According to this invention, the screen description is divided into a function block and a variable block, and the description is sent to the CRT display device as a function code + used variable iD.
An area for storing data as columns and an area for storing control data sequences for correlating function codes and used variables are prepared and stored in advance, and both areas can be searched on the display device side by a command from the host. By automatically displaying the data while displaying the data, the screen display processing on the host CPU is reduced, and by simply sending only the data to be displayed to the display device, the corresponding data can be displayed smoothly and quickly. This effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of this invention;
The figure is a reference diagram for explaining the screen description order, Figure 3 is a reference diagram for explaining the relationship between the screen description order, screen description memory, and data management memory, and Figure 4 is a reference diagram for explaining the relationship between the screen description order, screen description memory, and data management memory. 5 is a block diagram showing a conventional example of a CRT display method, FIG. 6 is a flow chart for explaining the operation, and FIG. 7 is a flowchart showing a conventional example of a CRT display method. A configuration diagram showing a conventional example, and FIG. 8 is a flowchart for explaining its operation. Description of symbols, 1...Host CPU, 2...Display device, 21...Processor, 22...Video memory, 23...CRT controller, 24...
...CRT, 25... Screen description memory, 26... Data management memory, 3... Transmission line, 15... Display function code, 16... ID of display data variable (order for data display).

Claims (1)

[Claims] 1. Based on instructions from a higher-level processor
A CRT display system that displays a predetermined display on a CRT, which includes a first memory that stores multiple screen display orders for forming each screen to be displayed, fixed data corresponding to each screen, and fixed data corresponding to each screen. and a second memory for storing a data display order regarding variable data, and when a screen type designation is received from the upper processor, the corresponding screen display order is stored from the first memory, and the corresponding screen display order is stored from the second memory. is characterized in that it retrieves and displays fixed data respectively, and when variable data is received from the upper processor, it reads out the screen display order corresponding to the data display order and displays the variable data on a predetermined screen. CRT display method.