JPH01105994A - State display system for virtual screen - Google Patents

Abstract

PURPOSE: To make screen switching operation easy by displaying information that a virtual screen which is displayed stores and information on a virtual screen whose contents are altered among virtual screens which are not displayed. CONSTITUTION: When the number of virtual screens stored in a RAM 10 is, for example, 4, a processor 5 gives numbers 1, 2, 3, and 5 to the respective virtual screens. In a display area of a display part 13, character strings in, for example, 24 lines are displayed and when a 25th line is a state display line, character codes for displaying the numbers 1, 2, 3, and 4 are written in an area of a screen buffer memory 11 corresponding to the 25th line. Then bit specifying attributes are added to the character codes of those 1-4 to display, for example, 1 when one virtual screen is being displayed and blink the number of a virtual screen whose contents are altered, e.g. 3. Therefore, the blinking number 3 is displayed at the lowermost part of the display part 13 and the screen switching operation can be made easy.

Description

[Detailed Description of the Invention] [Summary] A display device that stores a plurality of display data for one screen as one virtual screen and selects and displays one of them, the number of stored virtual screens and the currently displayed virtual screen. Regarding the method of displaying the status of virtual screens that displays virtual screens and rewritten virtual screens, information on which of the stored virtual screens is currently being displayed and information about which of the virtual screens that are not being displayed is displayed. The purpose is to reduce the burden on the operator by displaying information on which virtual screens have had their contents changed, and notifying the presence or absence of rewritten virtual screens to make it easier to switch between display screens. , one screen's worth of display data is stored as one virtual screen, and at the operator's selection, one of the virtual screens is displayed, and the contents of the virtual screen are changed by ↑Revoke from the host device. In a display device whose contents are changed, information is provided as to which of the stored virtual screens is the currently displayed virtual screen, and which of the virtual screens that are not being displayed is the virtual screen whose content has been changed. When the content of the virtual screen is changed based on information indicating which of the stored virtual screens is the currently displayed virtual screen and an instruction from the host device, this If the virtual screen is not currently being displayed, information indicating which virtual screen has had its contents changed is displayed in a part of the display screen.

[Industrial application field]

The present invention relates to a display device that stores a plurality of display data for one screen as one virtual screen and selects and displays one of them, and particularly relates to the number of stored virtual screens, the virtual screen currently displayed, and rewriting. The present invention relates to a virtual screen status display method for displaying a virtual screen that has been created.

In recent years, as display devices have become more sophisticated, a single display device can
Devices that have a function that allows them to be used as multiple display devices have come to be provided. Such a display device stores display data for one screen as one virtual screen, stores multiple virtual screens, and displays each virtual screen in a window or displays individual virtual screens by switching screens. It is now possible.

By the way, the display data for one screen displayed on the display device is easy to read (and when the contents of the virtual screen are changed, it is necessary to reduce the burden on the operator by displaying that the contents have been changed. be.

[Conventional technology]

In a display device that displays a virtual screen in a window, one display screen is divided into multiple display frames, and display data for one screen is displayed within the frames. Therefore, although display data for one screen is reduced and becomes smaller, a plurality of virtual screens can be displayed simultaneously.

In display devices that display virtual screens by switching screens,
Reads the virtual screen specified by the operator from memory,
Since the data is displayed in the entire display area, one screen's worth of display data is displayed as is.

[Problem that the invention seeks to solve]

As mentioned above, in conventional display devices that perform window display,
There is a problem in that the display range of the displayed data on each virtual screen is smaller than the display area of the original display device, which makes it difficult to see and the displayed contents may become unclear.

For this reason, display devices that perform screen switching are generally used. However, in display devices that switch screens, one virtual screen is displayed in the entire display area, so there is no problem with the former, but only one of the multiple virtual screens is displayed, and the others are not displayed. Since it is not displayed, even if the display data on the undisplayed virtual screen is rewritten, the operator cannot see it. Therefore, it is necessary to constantly switch the screen and display an undisplayed virtual screen to check whether there has been any rewriting, which poses a problem of heavy burden on the operator.

In a display device that performs screen switching, the present invention provides information on which of the stored virtual screens the virtual screen currently being displayed is, and which virtual screen whose content has been changed among the virtual screens that are not being displayed. By displaying information indicating whether or not a virtual screen has been rewritten, the purpose is to notify the presence or absence of a rewritten virtual screen and to facilitate switching of display screens, thereby reducing the burden on the operator.

(Means for solving problems) FIG. 1 is a block diagram of the principle of the present invention.

If the number of virtual screens stored in the RAM 1.0 is, for example, 4, the processor 5 uses the instruction means 16.
Based on the instructions, numbers 1.2 and 3.4 are assigned to each virtual screen, respectively. If the display area of the display unit 13 displays, for example, 24 lines of character strings, and the 25th line is a status display line, then the area corresponding to the 25th line of the screen buffer memory 11 has 1.2, 3. Write the character code to display the number 4.

Then, a bit specifying an attribute is added to the character code of 1 to 4, and if the virtual screen being displayed is 1, it is displayed as above, and the number of the virtual screen whose contents have been changed, for example, 3 is Specify to blink.

The display control circuit 12 uses the screen buffer memory 11.

The contents are read out and sent as a video signal to the display section 13 for display. Therefore, if the blinking number 3 is represented by ■, then the bottom of the display area of the display section 13 is soil, 2. ■, 4
It will be displayed as follows.

[Operation] With the above configuration, the processor 5 can display the number of virtual screens stored in a part of the display area of the display unit 13, the number of the virtual screen currently being displayed, and the contents according to instructions from the instruction means 16. In order to display the number of the virtual screen that has been changed, it is possible to display information on which of the stored virtual screens has virtual screen data that is currently being displayed, as well as information on whether the content has been changed among the virtual screens that are not being displayed. It is possible to display information on which virtual screen is currently used.

Therefore, by recognizing the number of the virtual screen whose contents have been changed and displaying the virtual screen with this number, the operator can confirm the changed contents and can also return the display to the original virtual screen. This makes it possible to reduce the burden on the operator.

〔Example〕

FIG. 2 is a block diagram of a circuit showing an embodiment of the present invention.
FIG. 3 is a diagram for explaining the operation of FIG. 2, and FIG. 4 is a flowchart for explaining the operation of FIG. 2.

The processor 5 operates based on instructions from the program read from the ROM 6. Then, the display data input from the interface circuit 8 and sent out by the host device is written into the RAM 10.

At this time, the processor 5 reads the instruction program 7 stored in the ROM 6, and according to the instructions of the instruction program 7, the display data for one screen is stored in the RAM as a virtual screen.
In the case of storing the virtual screen as 0, as shown in FIG. 4, a number is given to each virtual screen in sequence.

Therefore, assuming that the number of virtual screens is 4, numbers 1 to 4 are assigned to each virtual screen.

As shown in FIG. 4, the processor 5 monitors the instruction to display the virtual screen, reads out the virtual screen designated by the operator from the keyboard 9 from the RAM 10, and develops one screen in the screen buffer memory 14. This virtual screen is displayed on the display screen 17 of the display unit 13 via the display control circuit 15, as shown at 18 in FIG. 3(a).

At this time, the processor 5 writes a number and attributes to the last line of the screen buffer memory 11, as shown in FIG.

That is, if the display area of the display unit 13 displays, for example, 24 lines of character strings, and the 25th line is a status display line, 1.
Write the character code to display the numbers 2, 3, and 4.

Then, assuming that the number of the virtual screen displayed on the display unit 13 is 1, it is written in the 25th line of the screen buffer memory 11, and an underlined attribute bit is added to the character code of 1.

Therefore, the display control circuit 12 transfers the contents of the 25th line of the screen buffer memory 11 to the display unit 1 as shown in FIG. 3(a).
3 is displayed on the lower status display line of the virtual screen 18 displayed in the display area 17. In other words, the status display line shows 1,2,3
．． 4 is displayed.

As shown in FIG. 4, the processor 5 monitors whether the display of the next virtual screen is instructed, and when the display of the next virtual screen is instructed, it changes the attribute of the corresponding number and performs the same process as described above. The virtual screen and number will be displayed, but if no instructions are given, the process will end.

Then, it monitors the instruction to rewrite the virtual screen, and transfers information from the host device to the RAM via the interface circuit 8.
When there is an instruction to rewrite one of the virtual screens stored in l0 and data for rewriting is sent, the processor 5 changes the contents of the designated virtual screen based on this data.

At this time, the processor 5 changes the attribute of the corresponding number. In other words, if the number of the virtual screen whose contents have been changed is 3, then the attribute added to the character code indicating 3 among the character codes 1 to 4 written in the 25th line of the screen buffer memory 11. Change the bit to an attribute bit that instructs blinking.

Then, the process returns to the routine of monitoring the display of the next virtual screen.

Therefore, if the blinking number 3 is represented by ■, the display control circuit 12 changes the display content of the status display line of the display unit 13 to the third
As shown in Figure (b), soil, 2. ■, change to 4 and display. Therefore, the operator can recognize that the contents of the virtual screen 3 have been changed.

〔Effect of the invention〕

As explained above, the present invention stores a plurality of virtual screens,
If the content of a virtual screen that is not being displayed changes on a display device that displays one of them, that information can be displayed, eliminating the need for the operator to constantly check for changes. Since it is easy to switch the display to the virtual screen that has been created, the burden on the operator can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of a circuit showing an embodiment of the present invention, Fig. 3 is a diagram explaining the operation of Fig. 2, and Fig. 4 is a diagram of the circuit shown in Fig. 2. It is a flowchart explaining the operation. In the figure, 5 is a processor, 6 is a ROM, 7 is an instruction program, 8 is an interface circuit, 9 is a keyboard, 10 is a RAM, 11.14 is a screen buffer memory, 12 and 15 are display control circuits, 13 is a display unit, 16 is an instruction means. '-1in' Figure 2! KajiE Lit Light Flow Chie←Part 4
figure

Claims (1)

[Claims] A plurality of display data for one screen are stored as one virtual screen, and one virtual screen among the plurality of virtual screens is displayed according to the operator's selection, and in response to instructions from the host device. Based on this, in a display device that changes the contents of the virtual screen, information on which of the stored virtual screens is the currently displayed virtual screen and the contents of the virtual screens that are not being displayed are changed. An instruction means (16) is provided for instructing to display information indicating which virtual screen is currently displayed among the stored virtual screens, and information indicating which of the stored virtual screens is the currently displayed virtual screen, as well as information indicating which virtual screen is being displayed among the stored virtual screens. When the content of the virtual screen is changed based on the instruction, if this virtual screen is not currently being displayed, information indicating which virtual screen whose content has been changed is one of the stored virtual screens, A virtual screen status display method characterized by displaying information in a partial area of a display screen.