JPS62243072A - Display device having multi-window display function - Google Patents

Abstract

PURPOSE:To reduce an operator's burden, and to improve the operability by executing a control so that a system state, etc., of a window having the highest priority are displayed on a specific area on a screen by interlocking with switching of the window. CONSTITUTION:With respect to a window having the highest priority, which has been stored in a window managing information store means, a means for generating the mask information for displaying a system state, etc., on a specific line on its display screen is provided. In this state, a control is executed so that a system state of a window having the highest priority is displaced in a specific area on a screen by interlocking with switching of the window. As a result, by interlocking with switching of the window, a system state, etc., of the window switched are displayed. In this way, an operator can always know the state of an active window, and an operator's burden for the operation is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a multi-purpose computer suitable for use in personal computers, office computers, word processors, DPS (data processing systems), and other various data processing devices having display terminals. Regarding the improvement of a display device having a window display function, in particular, when switching windows in a multi-window display system, the system layer etc. of the window with the highest priority can always be displayed on the same screen, The present invention relates to a display device that improves the operability of a data processing system to which a display device having a multi-window display function is connected by reducing the operational burden on an operator during parallel processing.

In recent years, personal computers, word processors,
2. Description of the Related Art Display devices having a multi-window display function are used in various data processing devices having a display terminal such as a DPS.

A multi-window display system displays in each window on one display screen the status of a job that is being executed in parallel by respective programs provided corresponding to a plurality of CPUs.

FIG. 7 is a functional block diagram showing an example of the configuration of main parts of a control unit in a conventional character display. In the drawing, 1 is a data receiving unit, 2 is a cursor control unit, 3 is a data control unit, and 4 is a display data buffer memory, 5 is an address control section, 6 is a cursor address register, 7 is a data conversion section, 8 is a synchronization control section, 9 is a CR
A display device such as T is shown.

The functions of each part are outlined below.

The data receiving unit 1 is an external CPU (not particularly shown).
Receive data transferred from.

For example, when display data arrives from the CPU for one character string,
The data receiving section 1 sends the data to the one display data buffer memory 4 through the data control section 3.

The cursor control unit 2 decodes the control code sent from the data receiving unit 1 and sends a new address to the cursor address register 6.

For example, ESC(10: 20H moves the cursor to 106
If it is a control code located in the 20th column, the cursor control unit 2 converts this control code into an address of the display data buffer memory 4 and sends it to the cursor address register 6.

The data control section 3 sends the data from the data reception section 1 to the display data buffer memory 4.

The display data buffer memory 4 is a memory that stores display data. This display data buffer memory 4 stores characters displayed on one screen as codes (usually 1 byte).

The address control section 5 controls the address of the display data buffer memory 4. The display address is given from the synchronization control section 8 to the one display data buffer memory 4 via the address control section 5. Further, the cursor address is given from the cursor address register 6.

The cursor address register 6 stores the current cursor address given from the cursor control section 2. Therefore, the address of the cursor address register 6 corresponds to the cursor position on one screen.

The data conversion unit 7 uses a character generator to
Converts the character code to a pattern for display, and also
Performs serial conversion of parallel data and creates display signals.

The synchronization control section 8 generates a synchronization signal necessary for display on the CRT of the display bag R9.

A display device 9 such as a CRT is a display means that displays input character data as a visible character pattern.

Next, the display operation of the circuit shown in FIG. 7 will be described.

As already explained, the address of the cursor address register 6 corresponds to the cursor position on the screen.

When display data for one character arrives at the data receiving section 1 from the CPU, the data is sent to the display data buffer memory 4 through the data control section 3.

A cursor address is given to the display data buffer memory 4 from the cursor address register 6 via the address control section 5, and the display data for one character from the data receiving section 1 is stored in the display data buffer corresponding to the cursor position. It is stored in the address location of memory 4.

When the display data for one character is stored, the cursor address register 6 is advanced by one and the data received from the CPU is stored in the address position of the display data buffer memory 4 corresponding to the next position on one screen. be done.

On the other hand, the synchronization control unit 8 sequentially generates display addresses in synchronization with the rask scanning of the CRT of the display device 9.

This display address is given to the display data buffer memory 4 via the address control section 5.

Therefore, the contents (character codes) of the sequentially given display addresses are read out from the display data buffer memory 4 and sequentially sent to the data control section 3.

The read content, that is, the character code, passes through the next data control section 3 and is sent to the data conversion section 7.

In the data conversion section 7, the input character code is converted into display pattern data by a character generator, and a display signal is created by processing such as parallel/serial conversion.

The dot pattern display signal created by the data conversion section 7 is sent to the display device 9 together with the synchronization signal generated by the synchronization control section 8, and displayed on the CRT screen.

Regarding cursor display, when a control code for changing the cursor address is given from the CPU, it is transmitted from the data receiving section 1 to the cursor control section 2.

The cursor control unit 2 decodes this control code and sends a new address to the cursor address register 6. Therefore, the display position of the cursor changes every time the cursor moves, and the cursor is always displayed at the latest position.

By the way, as already mentioned, multi-window display divides the display screen of a single physical display device such as a CRT into an arbitrary number of sections, and displays separate information in each section. This is a display method that displays

FIG. 8 shows an example of a multi-window display.

In the drawings, D1 to D4 are display devices.

In this FIG. 8, in each section of the display device D4 shown on the right side, a plurality of display devices D1 to D3 on the left side are provided.
Multi-window display is performed by displaying an arbitrary portion of the displayed content surrounded by broken lines.

As described above, a display device having a multi-window display function allows a plurality of windows to be opened on one real screen such as a CRT.

The manner in which the windows overlap, the size of the windows, the display portion, the display position of the windows, etc. are changed by operating the control keys on the keyboard.

Such multi-window display is often used when a plurality of interrelated jobs are processed in parallel.

In the case of a multi-window display system, in the display diagram of Figure 8 [04], only one window in each section can be operated by keystrokes, and processing such as keystrokes is performed only for that window. be able to. Activate this window (ACTIVjE)
Other windows are displayed to refer to the contents or to monitor the progress of parallel processing, and cannot be used for input.

Next, a conventional display device having a multi-window display function will be described.

FIG. 9 is a functional block diagram showing the main configuration of the control unit of a conventional display device having a multi-window display function. Reference numerals in the drawing are the same as those in FIG. 7, and IOA to 10n are The first to nth window control units, 11 to 14 are each window control unit 10A”lOn
11 is a virtual screen buffer memory; 1 is a virtual screen buffer memory;
2 is a cursor control unit, and 13 is a cursor address register.

14 is a cutting control section, 15 is a multi-window control section,
16 is a keyboard control unit, and 17 is a keyboard.

Here, if the maximum number of windows that can be displayed on the CRT screen of the display device 9 is n, then n window control units are required.

The n window control units, that is, the first to nth window control units 10A to Ion, each include a virtual screen buffer memory 11, a cursor control unit 12, a cursor address register 13, and an extraction control unit 14. has been done.

Data received from the CPU or the like is accompanied by information indicating in which window the data should be displayed.

Based on this information, the data receiving section 1 sends data to the window control sections 10A to 10n to which data should be sent.

In this case, the data includes not only character data to be displayed, but also cursor control codes and the like.

The character data is sent to the corresponding window control unit 1゜A to Io.
It is stored in the virtual screen buffer memory 11 within n.

Here, among the n virtual screen buffer memories 11,
A case will be explained in which three virtual screen buffers are used.

1O (1) to (3) are diagrams showing three virtual screen buffer memories and the positions of their extraction windows.
Broken lines in the drawings indicate areas to be cut out.

FIG. 11 is an example of a display data buffer memory when displaying data in each cutout area of the virtual screen buffer memory in FIGS. 1O (1) to (3) in a multi-window.

From the three virtual screen buffer memories shown in FIG. 10 (1) to (3), data within the range of broken lines is cut out,
Write to the display data buffer memory as shown in Figure 11,
Perform multi-window display.

The extraction position of the virtual screen buffer memory 11, ie, the display section, is indicated by the address.

FIG. 12 is a diagram for explaining addresses of the virtual screen buffer memory 11.

The virtual screen buffer memory 11 is given one row address and column address as shown in FIG. 12.

In the virtual screen buffer memory 11 shown in FIG. 10 (1) to (3) above, when data is extracted from the area surrounded by a broken line, the upper left coordinates of the area, that is, the 1st row address and the column address. All you have to do is specify.

In multi-window display, in addition to the cutout position, it is also necessary to specify the size of each window and how they overlap.

For this purpose, the multi-window control unit 15 includes a window management register, and each window control unit 10A
-Ion's extraction control unit 14 has a mask register,
Each is provided.

FIG. 13 is a diagram showing an example of a window management register. In the drawing, p"-'v indicates an item of contents stored in the window management register.

As shown in FIG. 13, the window management register contains information such as the window level indicating the order in which each window overlaps, the cutting position of the virtual screen buffer, the vertical and horizontal length indicating its size, and the window position. Each information is stored.

The window level that indicates the order of overlapping of each window is 1 for the window displayed at the top.

Thereafter, the level number increases in the order of 1 overlap to 2, 3.4.

The position of each window on one display data buffer memory 4 is managed by the row and column address of the upper left coordinates of the window (location 11 on the display data buffer memory 4).

The following Fig. 14 (1) to (3) are shown in Fig. 10 (1) to (3).
) The specific configuration of the three window management registers when a partial area is cut out from the three virtual screen buffer memories 11 shown in FIG. 11 and written to the display data buffer memory 4 as shown in FIG. FIG.

FIGS. 15(1) to 15(3) are diagrams showing specific configurations of the same three mask registers.

Each window control unit 10A to Ion cutout control unit 14
are provided with mask registers as shown in FIG. 15 (1) to (3).

The multi-window control unit 15 operates as shown in FIG. 14 (1) to (3).
According to the contents of the window management register shown in ), mask information is written to each of the mask registers shown in FIG. 15 (1) to (3).

The mask register has the same size (vertical and horizontal size) as the virtual screen buffer memory 11, and its coordinates, that is, row and column addresses, also correspond to the coordinates of the virtual screen buffer memory 11.

Therefore, if the contents of the mask register determined by a certain row address and column address are II I N, the contents of the virtual screen buffer memory 11 at the same row address and column address are transferred to the display data buffer memory 4, and u Ogg
If so, it will not be transferred.

Such transfer to the display data buffer memory 4 is performed every time new data (data received from the CPU) is written to the virtual screen buffer memory 11.
The display data buffer memory 4 always stores the latest data in the virtual screen buffer memory 11.

Note that the window management register provided in the multi-window control unit 15 can be controlled by instructions from the keyboard.
Its contents are rewritten, and when the contents are rewritten, the contents of each mask register are also rewritten. Therefore, data is transferred from the virtual screen buffer memory 11 to the display data buffer memory 4 according to the new contents of the mask register.

For example, when the window level is changed by a keyboard operation, the contents of the mask register are also rewritten accordingly.

In a display device having a multi-window display function, data of a display section cut out from the virtual screen buffer memory 11 is displayed in a window through the above-described processing.

By the way, in the case of a multi-window display system, it has been conventional practice to use a part of the real screen as a system area (usually the bottom line or bottom line) to display the system status at that time.

For example, in the 1 Japanese word processor, the input mode for kana-kanji conversion input (kanji input or alphanumeric input), reading during input, candidate character display, etc. are performed, and error display is also performed.

Among data processing devices using conventional multi-window display systems, for example, there is only one system that allows Kana-Kanji conversion input, and the other systems do not use this input mode using Kana-Kanji conversion input.

Figures 16 (1) and (2) are display examples on the actual screen to explain the display state of the system area when switching windows in a conventional multi-window display system. The word processor window EDIT indicates an editing window for alphabetic text.

As shown in FIG. 16 (1), two windows JWP and EDIT are displayed, and one window JWP
Suppose that is activated.

Suppose that the window is switched in the display state of FIG. 16(1) and the window EDIT is made the active window as shown in FIG. 16(2).

In this case, when editing the alphabetic text, it is not necessary to enter the Kana-Kanji conversion input mode, but the Kana-Kanji conversion input mode is displayed as is in the system area.

Additionally, it was not possible to switch windows during the input operation for kana-kanji conversion. .

Note that although Figures 16 (1) and (2) show the case where the input mode of the Japanese word processor's kana-kanji conversion is displayed, in the conventional multi-window display system,
The configuration is not such that the system status of the active window is displayed each time the window is switched.

In this way, for example, in a Japanese word processor system, even if the system status is displayed in the system area for the input mode of kana-kanji conversion, if you switch to another system, the display in the system area will also change depending on that system. This method of switching has not been used in conventional multi-window display systems.

Therefore, when switching windows, displays that are no longer needed in the current window may continue to be displayed.
There is a problem in that the system status of the switched window cannot be seen on the display screen, which causes an inconvenience in that the operator is forced to work inefficiently.

Purpose Therefore, the display device having a multi-window display function of the present invention solves such inconveniences in conventional display devices, and is capable of displaying the system status of the switched window in response to window switching. The purpose of this invention is to reduce the burden on the operator and improve the operability of a display terminal, etc. to which a display device having a multi-window display function is connected.

Configuration To achieve this, the display device of the present invention includes a physical display device, a display data buffer memory for storing display data of the display device, at least two virtual screen buffer memories, and the virtual screen buffer memory. means for cutting out data of a partial area as display data; window management information storage means for storing management information for displaying each cut out area in a window; and each of the pieces of data cut out from the virtual screen buffer memory. a display device having a multi-window display function, comprising means for combining data in an area by mask processing and outputting the combined data to the display data buffer memory, the window having the highest priority stored in the window management information storage means; , a means is provided to generate mask information for displaying the system status, etc. on a specific line on the display screen, and the system status, etc. of the window with the highest priority is specified on the screen in conjunction with window switching. Controls what is displayed in the area.

Next, embodiments of the display device having a multi-window display function of the present invention will be described in detail with reference to the drawings.

FIGS. 1 (1) and (2) are flowcharts showing the flow of keyboard input processing in a display device having a multi-window display function according to the present invention; (1) is a flow chart showing the overall processing flow; (2) is a flow showing the flow of window switching processing in the flow shown in (1). The symbols in the drawings are the same as those in FIG. 13, and
Q is the row of the window, C is the column of the window, C is the maximum number of columns on the real screen, L is the maximum number of rows on the real screen, and I is the number of windows.

FIG. 2 is a diagram showing an example of the key layout of a keyboard used in the display device of the present invention.
indicates the operation key for window switching control.

The basic configuration of a display device having a multi-window display function according to the present invention is the same as the block diagram shown in FIG. 9 as a conventional example.

Next, window display control in the display device of the present invention will be explained with reference to the flowcharts in FIGS. 1 (1) and (2).

In FIG. 9, data input from a keyboard 17 is normally sent to a CPU or the like through a keyboard control section 16.

In this case, when the window operation key WS in FIG. 2 is pressed, the keyboard control unit 16 controls the subsequent data to
The data cannot be sent to the PU and the number key input is awaited. The general processing when the keys are operated manually is as shown in FIG. 1 (1).

In this state, when a numeric key is input, a window switching flow begins.

In the following example, as in the case of FIG. 16 (1) and (2), with two windows displayed,
Explaining the case of switching windows 6 In addition, the system area, that is, the system status display area is also set at the bottom line of the screen, as in the case of Figure 16, and the kana-kanji conversion screen is set in this system area. It is assumed that reading input and candidate characters are displayed.

The window switching process is shown in detail in the flowchart of FIG. 1(2).

That is, when a numeric key is input while waiting for the numeric key input in FIG. 1(1), the flow enters the flow shown in FIG. 1(2), and from the window management register corresponding to the input digit N, The window level p data indicating the overlapping order is extracted, and [1] is added to the window level information p in the window management register containing a smaller value.

Then, the window level p of the input number N is set to “1”.
”. Here, if k is the level information of window number N, then each window whose window level information is "1 to -1" has level information of "2 to k", and the level information of window number N is "k" has the highest priority, "1".

Next, after setting the contents of the mask registers of all the extraction control units 14 to 110'', the data of II II II is written according to the contents of the window management register using the following methods (1) and (2).

■ Among all combinations of α and C that satisfy (U≦2≦u+s)n (v≦c:av+t), combinations of Ω and C that satisfy the above conditions in two or more window management registers. teeth.

a and C excluding the one with lower window level information p
For the combination, the coordinate position in the mask register with row address q+Q-u and column address r+c-v is
? +

■ All parts corresponding to the bottom line of the mask register corresponding to the window management register whose window level P is rlJ (corresponding to the number N entered by the key) are set to '1''.
shall be.

In the display device of the present invention, among the conditions (1) and (2), the condition (2) has particularly important meaning.

That is, when writing to each mask register is completed according to the flow shown in FIG. 1(2), the mask register becomes 111 for all window control units 10A to Ion.
The contents of all the virtual screen buffer memories 11 corresponding to the coordinates 'g are transferred to the area in the display data buffer memory 4 starting with the window position information u, v (row and column) of the window management register.

Here, for the coordinates of the mask register whose mask information is II II II, the 1st row address is y, the 1st column address is
Then, the contents of row y and column X of virtual screen buffer memory 11 are converted to row r u + of display data buffer memory 4
y −q J will be transferred to 1 column rv+x−rJ.

The contents of the display data buffer memory 4 are displayed on the display screen g19, that is, on the actual screen, in the manner already described in detail as a conventional example.

Note that the window number whose window level is newly set to rlJ is sent from the keyboard control unit 16 to the outside (CPU, etc.).

Therefore, the CPU can determine that subsequent key manual data is data for a program corresponding to a new window number.

Through such processing, windows are switched, and the system status with the activated window level "1" is always displayed in the system display area.

Next, the operation at the time of window switching in the display device of the present invention will be explained with specific data examples.

In this embodiment, the CPU of the data processing system to which the display device of the present invention is connected executes a Japanese word processor and an English text editor, as described above with reference to FIG. It is assumed that each program outputs display data to windows 1 and 2.

FIGS. 3(1) and 3(2) are examples of the contents of two virtual screen buffer memories in the display device of the present invention.

(1) shows specific data examples of the virtual screen buffer 1, and (2) shows specific data examples of the virtual screen buffer 2.

FIG. 4 shows an example of the contents of the window management register in the display device of the present invention, and shows specific examples of data stored in the management registers of windows 1 and 2, respectively.

FIGS. 5(1) and 5(2) are examples of the contents of the mask register in the display device of the present invention shown in FIG.

(1) is a mask register l corresponding to window I.

(2) shows a specific example of data stored in each mask register 2° corresponding to window 2.

It is assumed that this state has the following premises.

Virtual screen buffer 1 allocated to the Japanese word processor and virtual screen buffer 2 allocated to the English text editor have data such as those shown in Figure 3 (1) and (2) already sent from the CPU. It has already been stored.

In the bottom rows of these two virtual screen buffers 1 and 2, data indicating the status of the two programs of the CPU is stored.

Virtual screen buffer 1 shows a state where kana-kanji conversion input is being performed using a Japanese word processor, and virtual screen buffer 2 shows a state where alphanumeric characters are being input using a text editor.

As shown in FIG. 4, the window management register provided in the multi-window control unit 15 contains
．． Management information corresponding to 2 is stored.

In mask registers 1.2 provided in the extraction control section corresponding to windows 1 and 2 in FIG.

Mask information as shown in FIGS. 5(1) and (2) is held.

Based on this premise, various types of information as shown in FIGS. 3 to 5 are stored in the virtual screen buffer l.

2. Window management register, mask register l.

2, respectively.

FIGS. 6(1) to 6(5) show specific examples of data stored in the display data buffer memory 4 to explain changes in the display state when switching windows in the display device of the present invention.

First, when the information shown in Figs. 3 to 5 is stored, the display data buffer memory 4 stores data as shown in Fig. 6 (1), and the contents of this data remain unchanged. , are displayed on the CRT display screen of the display device 9.

In the display state shown in FIG. 6(1), following the pressing of the window switching control key ws on the keyboard shown in FIG.
When the number key "2" is pressed, the window level information p of window 2 changes to "1" in the window management register of FIG. 4, as already explained in connection with FIG. 1 (2).
”, and the window level information p of window l is [
2”.

As a result, the contents of mask registers 1 and 2 shown in FIG. The bottom row of mask register 1 corresponding to window 1 in 1) is all "0", and instead, the bottom row of mask register 2 corresponding to window 2 in FIG. 5(2) is all "l". Become.

Therefore, the contents of the one-display data buffer memory 4, in other words, the display screen changes as shown in FIG. 6(2).

In this 61st!1(2) display state, input to the English text editor is possible.

In other words, in this state, the CPU determines that the data input using the key is input to the text editor. Attach a control code to indicate that it is present.

This "1" is echoed back (key manual data is sent from the CPU to the CRT).

Therefore, the key is displayed on the CRT screen as shown in FIG. 6(3) to inform the operator that the key has been manually pressed.

In the display state shown in FIG. 6(3), it is assumed that the switching control key WS is pressed again, and then the numeric key rlJ is pressed.

In this case, in the window management register in Figure 4,
Window level information p of window 1 becomes rlJ, and window level information p of window 2 becomes "2".

Therefore, it is displayed on the CRT screen as shown in FIG. 6(4).

For example, if you manually press rlJ in the display layer shown in FIG. It is interpreted that "regulation" has been input.

Therefore, it is echoed back as shown in FIG. 6(5).

As described above, in the display device of the present invention, the mask information of the system display area provided at the bottom line or the bottom line of one display screen is written every time the active window level is changed to "1". This controls the input mode status of the program to always be displayed on the same screen.

In addition, in the above embodiment, the input mode, that is, kana-kanji input and alphanumeric manual input, is linked to the window switching,
The case where the display is switched has been explained.

However, the present invention is not limited to the input mode; for example, it is also possible to switch the display of the system status such as an error display or a warning message to the display of the switched system in conjunction with window switching. therefore,
It is clear that the display device of the present invention can be applied to such cases as well.

As described in detail above, the display device of the present invention includes a physical display device, a display data buffer memory that stores display data of the display device, at least two or more virtual screen buffer memories, and a virtual screen buffer memory that stores display data of the display device. means for cutting out data in a partial area of the screen buffer memory as display data; window management information storage means for storing management information for displaying each cut out area in a window; and means for cutting out data from the virtual screen buffer memory. a display device having a multi-window display function, the display device having a multi-window display function, the display device comprising: means for combining data of each area by mask processing and outputting the combined data to the display data buffer memory; For the tallest window, a means is provided to generate mask information for displaying the system status, etc. on a specific line on the display screen, and the system status, etc. of the window with the highest priority is displayed on the screen in conjunction with window switching. It is controlled so that it is displayed in a specific area above.

Therefore, according to the display device having the multi-window display function of the present invention, the system status, etc. of the switched window is displayed in conjunction with window switching, so that the operator can always check the active window. It becomes possible to know the status of

For example, when a Japanese word processor requires Kana-Kanji conversion input, it is displayed in the system display area, and when the window is switched to another window, the system status is displayed, reducing the operational burden on the operator. Ru.

As a result, the excellent effect of significantly improving the operability of a display terminal, etc. to which this display device is connected can be achieved.

[Brief explanation of drawings]

FIGS. 1 (1) and (2) are flowcharts showing the flow of keyboard input processing in a display device having a multi-window display function according to the present invention; (1) is a flow chart showing the overall processing flow; (2) is a flowchart showing the flow of window switching processing in the flow shown in (1); FIG. 2 is a diagram showing an example of the key layout of a keyboard used in the display device of the present invention; FIG. (1) and (2) are examples of the contents of two virtual screen buffer memories in the display device of the present invention. (1) is virtual screen buffer 1. (2) is a specific example of the data in the virtual screen buffer 2, and FIG. 4 is an example of the contents of the window management register in the display device of the present invention. FIG. 5 (1) and (2) are examples of the contents of the mask register in the display device of the present invention shown in FIG.
(2) is a specific example of data stored in mask register 1 corresponding to window 1, (2) is mask register 2 corresponding to window 2, and FIGS. 6 (1) to (5) are representations of the present invention. A specific example of data storage in the display data buffer memory 4 for explaining the change in display state when switching windows in the device. FIG. 8 is a functional block diagram showing an example of a multi-window display, and FIG. 9 is a functional block diagram showing the main configuration of a control unit of a conventional display device having a multi-window display function. Figures 10 (1) to (3) are diagrams showing three virtual screen buffer memories and the positions of their extraction windows;
The figure shows an example of the display data buffer memory when displaying data in each cut-out area of the virtual screen buffer memory in Figures 1O (1) to (3) in a multi-window. FIG. 13 is a diagram showing an example of the window management register. FIG. 14 (1) to (3) are diagrams for explaining the three virtual registers shown in FIG. 10 (1) to (3). 12 is a diagram showing a specific configuration of three window management registers when a partial area is cut out from the screen buffer memory 11 and written to the display data buffer memory 4 as shown in FIG. 11. FIG. FIGS. 15(1) to 15(3) are diagrams showing specific configurations of three mask registers. FIGS. 16(1) and 16(2) are display examples on a real screen for explaining the display state of the system area when switching windows in a conventional multi-window display system. In the drawing, 1 is a data receiving section, 4 is a display data buffer memory, 9 is a display device such as a CRT, and 10A to 10n.
11 is a virtual screen buffer memory, 12 is a cursor control unit, 13 is a cursor address register, 14 is an extraction control unit, 15 is a multi-window control unit, 16 is a keyboard control unit, 17 is a keyboard. Shin 1 Diagram (1) 蝝 4 Leap 5 Diagram O 6 Figure Body 8 Zukanaka 10 [21 Material 11 Diagram

Claims (1)

[Claims] A physical display device, a display data buffer memory that stores display data of the display device, at least two or more virtual screen buffer memories, and data in a partial area of the virtual screen buffer memory is extracted as display data. means and
window management information storage means for storing management information for displaying each cut out region in a window; and a display data buffer memory that combines data of each cut out region from the virtual screen buffer memory through mask processing. In a display device having a multi-window display function, the system status, etc. is displayed in a specific line on the display screen for the window with the highest priority stored in the window management information storage means. A display characterized by comprising means for generating mask information for display, and controlling so that the system status, etc. of the window with the highest priority is displayed in a specific area on the screen in conjunction with window switching. Device.