JPH09160748A - Graphic controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To actualize the increase of CRTs, a high definition, and the complexity of graphic processing by selecting a frame memory provided corresponding to each CRT according to a specification signal from the display controller and storing image data of the address map of the display controller. SOLUTION: The display controller 20 generates image data, stores the image data in the address map, and further outputs the specification signal specifying CRTs 351 -35m where the image data are displayed. A large-screen display device 30 selects frame memories 331 -33m provided corresponding to the CRTs 351 -35m according to the specification signal outputted from the display controller 20, stores the image data stored in the address map of the display controller 20 in the frame memories 331 -33m , and displays the image data on the CRTs 351 -35m . Consequently, even when address space of a large capacity is needed, address space can efficiently be used corresponding to it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a graphic control device for controlling a large screen display device for displaying an image by combining a plurality of CRTs.

[0002]

2. Description of the Related Art FIG. 14 shows, for example, Japanese Patent Application Laid-Open No. 2-302794.
FIG. 1 is a configuration diagram showing the relationship between the configuration of a conventional graphic control device and the configuration of a large screen display device shown in Japanese Patent Publication No. 1-96, wherein 1 is a display control device and 2 is a drawing process for a large screen display device 10. CPU for executing the above, 3 is an expansion bus interface for exchanging digital data between the CPU 2 and the large screen display device 4, 4 is an expansion bus, and 10 is a plurality of CRTs 11 _{1 to} 11 _n connected, and these are combined. It is a large-screen display device that displays one image.

Bus interfaces 1 to 12 _{1 to} 12 _n
A frame memory for inputting digital data from the CPU 2 via 3, 3 _{1 to} 14 _n is a frame memory 12
Display means for converting the contents read from _{1 to} 12 _n into a digital input signal for CRT, and 15 for each frame memory 12 _{1 to} 12 _n and display means 14 _{1 to} 14
It is connected to _n, by generating a timing signal necessary for transmission, a display device control circuit to display the contents stored in the frame memory 12 ₁ to 12 _n to the CRT 11 ₁ to 11 _n.

Next, the operation will be described. Figure 15 is a block diagram for explaining the operation of a conventional graphics controller, in FIG, 5 ₁ to 5 _n is a frame memory area that is mapped to CPU2 address space, the same reference numerals as in FIG. 14 Is omitted. CPU2
The frame memory areas 5 _{1 to} 5 _n of the address space are divided corresponding to the frame memories 12 _{1 to} 12 _n . The individual data storage areas of the frame memories 12 _{1 to} 12 _n correspond to the pixels of the CRTs 11 _{1 to} 11 _{n on} a one-to-one basis.

First, the CPU 2 specifies a target area from the frame memory areas 5 _{1 to} 5 _n mapped in the address space, and then, for example, when the CPU 2 specifies the frame memory area 5 ₁ , each pixel The digital data corresponding to the above are sequentially stored in the frame memory area 5 ₁ . Next, the CPU 2 notifies the display device control circuit 15 of the designated frame memories 12 _{1 to} 12 _n via the expansion bus interface 3, the expansion bus 4, and the bus interface 13 of the large screen display device 10.

Then, in the display device control circuit 15, the CPU
Designated by, for example, 2, connects the frame memory 12 ₁ and the bus interface 13, sequentially stores the digital data sent from the frame memory area 5 ₁ in the frame memory 12 _1. Next, the display device control circuit 15
Then, the digital data stored in the frame memory 12 ₁ is converted into a digital input signal for CRT through the display means 14 ₁ and then sequentially output to the CRT 11 ₁ .

[0007]

Since the conventional graphic control device is constructed as described above, the CRT 11
In order to cope with the increase in the number of pixels and the increase in the number of pixels accompanying the higher definition of the CRT 11, and the complicated graphics processing.
A large amount of address space was needed. However, due to the restrictions on the address space of the expansion bus, the number of CRTs increases and C
There is a problem that the high definition of the RT 11 and the complexity of graphic processing must be limited.

The present invention has been made in order to solve the above problems, and increases the CRT 11 and the CRT 11 by efficiently using the address space of the CPU 2.
It is an object of the present invention to obtain a graphic control device capable of realizing high definition of and high complexity of graphic processing.

[0009]

According to a first aspect of the present invention, there is provided a graphic control device for generating image data, storing the image data in an address map, and generating the image data. To display C
A first frame memory provided corresponding to each CRT by outputting a designation signal designating RT, and by the first large screen display device based on the designation signal output from the first display control device. By selecting, the image data stored in the address map of the first display control device is stored in the first frame memory, and the image data stored in the first frame memory is displayed on the CRT. Is.

In the graphic control device according to the second aspect of the present invention, the first frame memory selection means has a register for storing the designation signal output from the first display control device, and is set in this register. The first frame memory is selected based on the designated signal.

According to a third aspect of the present invention, there is provided a graphic control device, wherein the second display control device generates image data, stores the image data in an address map divided into a plurality of bank areas, and at the same time, a CRT. A bank designation signal designating a bank area to be displayed on the second display controller is output by the second large-screen display device based on the bank designation signal output from the second display controller. The image data of the bank area stored in the map is stored in each second frame memory, and the image data stored in the second frame memory is displayed on the CRT.

According to a fourth aspect of the present invention, in the graphic control device, the third display control device generates image data, stores the image data in an address map divided into a plurality of bank areas, and A designation signal that designates a CRT that displays data and a bank designation signal that designates a bank area to be displayed on the CRT are output, and the designation signal output from the third display control device by the third large screen display device. And each C based on the bank designation signal
A second frame memory provided corresponding to RT is selected, image data of the bank area stored in the address map of the third display controller is stored in the selected second frame memory, and The image data stored in the second frame memory is displayed on the CRT.

According to a fifth aspect of the present invention, in the graphic control device, the fourth display control device generates image data, stores the image data in an address map divided into a plurality of bank areas, and at the same time, a CRT. The bank designation signal designating the bank area of the image data to be displayed on the screen is output, or predetermined copy information is output when the copy processing is performed between the bank areas, and the fourth large screen display device displays the fourth screen information. The image data of the bank area stored in the address map of the fourth display control device is stored in the respective second frame memories based on the bank designation signal output from the display control device of Based on the copy information output from the control device, copy processing between the bank areas is performed, or the image data stored in the second frame memory is processed. It is obtained so as to display the data on the CRT.

According to a sixth aspect of the present invention, in the graphic control device, the fifth display control device generates image data, stores the image data in an address map divided into a plurality of bank areas, and at the same time, a CRT. A bank designation signal for designating a bank area of image data to be displayed on the screen is output, or predetermined copy information is output when a copy process is performed between banks of a specific CRT. Based on the bank designation signal output from the fifth display controller, the image data of the bank area stored in the address map of the fifth display controller is stored in the respective second frame memories, 5 based on the copy information output from the display controller, all the second frame memories are assigned to the internal address map, As shown, the copy processing between the bank areas of the second frame memory corresponding to the specific CRT is performed, or the image data stored in the second frame memory is displayed on the CRT. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. 1 is a block diagram showing a graphic control device according to a first embodiment of the present invention, and FIG. 2 is a graphic control device according to the first embodiment of the present invention in which an address map of a CPU of a display control device and a frame of a large screen display device are shown. It is a block diagram which shows the relationship with a memory typically,
In the figure, 20 is a display control device (first display control device), 21 is a large screen display device (first large screen display device)
A CPU that performs read / write processing on the frame memories 33 _{1 to} 33 _n (first frame memory) in 30 to execute drawing, 22 is an expansion bus interface in the display control device 20, and 23 is shown in FIG. An address map in the CPU 21 (address map of external CPU) composed of 196608 data strings of 4 bytes each,
Is an expansion bus that connects the CPU 21 and the large screen display device 30.

Reference numeral 30 is a large screen display device having a plurality of CRTs 35 _{1 to} 35 _n , 31 is a bus interface on the large screen display device 30 side, and 32 is a CRT channel register (register) 32a as shown in FIG. A frame memory selection unit (first frame memory selection unit) that allocates the frame memories 33 _{1 to} 33 _n to the address map 23 in the CPU 21, based on, for example, the CPU 21 to C
When 1 is written in the RT channel register 32a, the frame memory 33 ₁ is assigned to the address map 23 in the CPU 21. 34 ₁ to 34C _n display means for converting the data read from the frame memory 33 ₁ ~ 33 _n corresponding to each input signal _{CRT35 1 ~35 n, 35 1 ~35} n , as shown in FIG. 4,
For example, C composed of 767 vertical pixels and 1023 horizontal pixels
RT, for example, pixel P (0,0) to pixel P (3,3
4 pixels of 0) are assigned as one data string.

Next, the operation will be described. FIG. 5 is a flowchart showing an operation procedure of the graphic control device according to the first embodiment of the present invention. Where CRT35 ₁
For example, when the pixel P (X, Y) of the data string A is changed from white to black (see FIG. 4), first, the CPU 21 sets C
In order to select RT35 ₁ , 1 is written in the CRT channel register 32a (step ST1). Next, the frame memory selection unit 32 uses the CRT channel register 32a.
Based on “1” set in the frame memory 33 ₁
Is assigned to the address map 23 of the CPU 21 (step ST2).

Then, the CPU 21 sends the address (A) of the frame memory 33 ₁ corresponding to the pixel position on the screen to be drawn.
DDR + B (see FIG. 3)), the pixel data P to be updated
Read data string A including (X, Y) (step ST
3) and then the CPU 21 updates the pixel P (X, Y)
Only the color data of the part is rewritten by arithmetic processing. Then, the data string A is written in the original address of the frame memory 33 ₁ (step ST4). Then, the pixel P of CRT 35 ₁ data sequence A through the display unit 34 ₁
(X, Y) changes from white to black.

As described above, according to the first embodiment, the frame memory selection unit 32 is based on the setting of the CRT channel register 32a, and the frame memories 33 _{1 to} 3 3
Since 3 _n can be allocated to the address map 23 in the CPU 21, even if a large capacity address space is required, the address space can be efficiently used corresponding to it, and the CRTs 35 _{1 to} 35 _n can be efficiently used. Increase, CR
T35 high definition of ₁ to 35 _n, and there is an advantage that it is possible to realize the complexity of graphics processing.

Embodiment 2 FIG. 6 is a block diagram schematically showing the relationship between the address map of the CPU of the display control device and the frame memory and bank divided frame memory of the large screen display device in the graphic control device according to the second embodiment of the present invention. In the figure, the same reference numerals as those in the first embodiment indicate the same or corresponding parts, and therefore the description thereof will be omitted. Reference numerals 41 _{1 to} 41 _n are bank divided frame memories (second frame memories) divided into a plurality of storage areas (hereinafter referred to as banks), and 42 is a frame memory selection unit 3
2 is a bank selection register which is provided in the bank 2 (see FIG. 1) and sets the banks in the bank divided frame memories 41 _{1 to} 41 _n .

In the first embodiment, the frame memory selection unit 32 is based on the setting of the CRT channel register 32a.
Although the frame memories 33 _{1 to} 33 _n are assigned to the address map 23 in the CPU 21 in the second embodiment, as shown in FIG. 6 and FIG.
The address map 23 in 21 is divided into the bank M in each of the divided frame memories 41 _{1 to} 41 _n (for example, the storage area of one bank is 196608 which is a 4-bit 1-data string).
The CPU 21 may switch the bank M based on an arbitrary setting of the bank selection register 42 while sequentially switching the frame memory selection unit 32.

Next, the operation will be described. FIG. 8 is a flowchart showing the operation procedure of the graphic control device according to the second embodiment of the present invention. First, CRT3
After drawing the triangle recorded in the bank ₁ of the bank divided frame memory 41 _{1 in} 5 ₁ , the CRT 35 ₂
An example will be described in which the quadrangle recorded in the bank 1 of the bank divided frame memory 41 ₂ is drawn, and the circle drawn in the bank 2 of the CRT 35 ₁ bank divided frame memory 41 ₁ is finally drawn.

First, the CPU 21 writes 1 in the bank selection register 42 in order to select bank 1 (step ST11). Next, the CPU 21 writes ₁ in the CRT channel register 32a in order to set the CRT 35 ₁ . As a result, the frame memory selection unit 32 determines, based on "1" set in the CRT channel register 32a,
The CPU21 of the address map 23 assigns a bank 1 bank division frame memory 41 ₁ (step ST1
2). Then, the CPU 21 writes the triangular data recorded in the bank 1 of the bank divided frame memory 41 ₁ (step ST13), and then the CPU 21 writes the rectangular data recorded in the bank 1 of the bank divided frame memory 41 _2. Is written (step ST14).

Next, the CPU 21 writes 2 in the bank selection register 42 in order to select bank 2 (step ST15). Next, the CPU 21 writes ₁ in the CRT channel register 32a in order to set the CRT 35 ₁ . As a result, the frame memory selection unit 32 determines, based on "1" set in the CRT channel register 32a,
The bank 2 of the bank divided frame memory 41 ₁ is assigned to the address map 23 of the CPU 21 (step ST1
6). Then, the CPU 21 writes the circular data recorded in the bank 1 of the bank division frame memory 41 ₁ (step ST17).

As described above, according to the second embodiment, the address map 23 in the CPU 21 is shared by the banks M in the bank divided frame memories 41 _{1 to} 41 _n , and the CPU 21 sets the frame memory selection unit 32. Since the bank selection register 42 is configured to be switched based on an arbitrary setting while sequentially switching, a large amount of data can be switched in an instant, so that a complicated drawing / display function is realized as compared with the first embodiment. The effect that can be obtained is obtained.

Embodiment 3 FIG. FIG. 9 is a configuration diagram schematically showing the relationship between the address map of the CPU of the display control device and the frame memory and bank divided frame memory of the large screen display device in the graphic control device according to the third embodiment of the present invention. In the figure, the same reference numerals as those in the first and second embodiments indicate the same or corresponding portions, and therefore their explanations are omitted. In the second embodiment, each bank division frame memories 41 ₁ to the address map 23 in the CPU21
The bank M in 41 _n is shared, and the CPU 21 switches only the bank selection register 42 based on an arbitrary setting.

In the second embodiment, as shown in FIG. 9, by providing the CRT channel register 32a and the bank selection register 42, the CPU 21 determines whether the CRT channel register 32a and the bank selection register 42 are set. Since a large amount of data can be switched in an instant since it is configured to switch arbitrarily, it is possible to obtain an effect that a complicated drawing / display function can be realized as compared with the first and second embodiments.

Fourth Embodiment 10 is a block diagram showing a graphic control device according to a fourth embodiment of the present invention, FIG.
1 is a configuration diagram schematically showing a relationship between an address map of a display control device and a frame memory of a large screen display device in a graphic control device according to a fourth embodiment of the present invention. Since the same reference numerals as those in 2 indicate the same or corresponding portions, the description thereof will be omitted. In the second embodiment, when simple graphic drawing of a straight line or polygon between banks or copying of a rectangular area is performed,
Although the copy processing is performed while changing the bank specified in the bank selection register 42 of the frame memory selection unit 32, as shown in FIG. 10, all the banks corresponding to the own frame memories 33 _{1 to} 33 _n Are assigned to the internal address map 62 by the drawing control units 61 _{1 to} 61
_The copy process can also be performed using _n .

Reference numeral 50 denotes a display controller (fourth display controller).
51) is a large screen display device (fourth large screen display device)
Frame memory 33 in 60₁ ~ 33_n Read against
61, a CPU for performing writing / writing processing and executing drawing₁ 
~ 61_n Is the frame memory 33 ₁ ~ 33_n Provided for each
The drawing control unit (first drawing control unit),
There is no setting in the bank selection register 42 of the memory selection unit 32.
In relation to own frame memory 33₁ ~ 33_n Correspond to
All banks assigned to the internal address map 62
ing. 63₁ ~ 63_n Is the CPU 51 and the drawing controller 61
₁ ~ 61_n Frame memory from 33₁ ~ 33_n Reading
An arbitration unit that arbitrates a read / write request.

Next, the operation will be described. When copying a predetermined region of the bank 2 of the frame memories 33 ₁ ~ 33 _n in a predetermined area of the bank 1 of the frame memories 33 ₁ ~ 33 _n, firstly, the drawing controller 61 ₁ CPU 51 is to specify
The copy source bank, the copy destination bank, the copy source address, the copy destination address, and the copy area are transmitted to .about.61 _n . Next, when data is transmitted from the CPU 51 to the drawing control units 61 _{1 to} 61 _n , the arbitration units 63 _{1 to} 63 _n exchange data with the frame memory selection unit 32 and the frame memories 33 _{1 to} 33 _n. The drawing control units 61 _{1 to} 61 _n and the frame memories 33 _{1 to} 33 are stopped.
_n and read / write requests only.

Next, the drawing control units 61 _{1 to} 61 _n are CPUs.
Copy processing is performed based on the copy source bank, copy destination bank, copy source address, copy destination address, and copy area designated by 51. Hereinafter, the drawing control units 61 _{1 to} 61 _n perform simple graphic drawing of straight lines or polygons between banks and copy processing of rectangular areas regardless of the setting of the bank selection register 42 of the frame memory selection unit 32. Since the second embodiment is configured so that
Compared with the above, the effect that the copy processing between the banks can be performed at high speed is obtained.

Embodiment 5 12 is a configuration diagram showing a graphic control device according to a fifth embodiment of the present invention, FIG.
3 is a configuration diagram schematically showing the relationship between the address map of the display control device and the frame memory of the large screen display device in the graphic control device according to the fifth embodiment of the present invention. The same reference numerals as 4 indicate the same or corresponding portions, and thus the description thereof will be omitted. Reference numeral 70 denotes a display control device (fifth display control device), and 71 denotes read / write processing for the frame memories 33 _{1 to} 33 _n in the large screen display device (fifth large screen display device) 80 for drawing. CPU to execute, 81 is all frame memory 33
Drawing control unit corresponding to _{1 to} 33 _n (second drawing control unit)
It is.

In the fourth embodiment, the drawing control units 61 _{1 to} 6 ₁
1 _n is provided for each frame memory 33 ₁ ~ 33 _n, has been described to perform only copying between the banks, in the fifth embodiment, as shown in FIG. 12, the drawing controller 61 ₁
˜61 _n may be one drawing control unit 81 and copy processing between banks and frame memories may be performed. In this case, the address map 72 of the drawing control unit 81, since it is configured so that all the frame memories 33 ₁ ~ 33 _n address map allocates, simple, such as lines and polygons between the frame memory 33 ₁ ~ 33 _n It is possible to obtain an effect that various graphic drawing and copying of a rectangular area, and simple graphic drawing of a straight line and a polygon between banks and copying of a rectangular area can be performed at higher speed than in the second embodiment.

[0034]

As described above, according to the first aspect of the invention, the first display control device generates the image data, stores the image data in the address map, and displays the image data. The first large screen display device outputs a designation signal for designating a CRT to be used for each C based on the designation signal output from the first display control device.
The first frame memory provided corresponding to the RT is selected, and the image data stored in the address map of the first display control device is stored in the first frame memory.
Since the image data stored in the frame memory of the CRT is configured to be displayed on the CRT, even if a large capacity address space is required, the address space can be efficiently used correspondingly, and the CRT's There is an effect that increase, high definition of CRT, and complexity of graphic processing can be realized.

According to the second aspect of the present invention, the first frame memory selecting means has a register for storing the designation signal output from the first display control device, and the designation signal set in this register. Since the first frame memory is selected based on the above, even if a large capacity address space is required, the address space can be efficiently used corresponding to the increase in the CRT and the CRT.
There is an effect that it is possible to realize high definition and complicated graphic processing.

According to the third aspect of the present invention, the second display control device generates image data, stores the image data in the address map divided into a plurality of bank areas, and displays the image data on the CRT. A bank designating signal designating a bank area is output and stored in an address map of the second display control device by the second large screen display device based on the bank designating signal output from the second display control device. Since the image data of the stored bank area is stored in each second frame memory and the image data stored in the second frame memory is displayed on the CRT, a large capacity address space is required. Even if there is, the address space can be used efficiently correspondingly, increasing the number of CRTs, increasing the definition of CRTs, and duplicating graphic processing. There is an effect that it is possible to realize a reduction.

According to the fourth aspect of the present invention, the third display control device generates image data, stores the image data in the address map divided into a plurality of bank areas, and displays the image data. And a bank designation signal for designating a bank area to be displayed on the CRT.
Based on the designation signal and the bank designation signal output from the third display control device, the second frame memory provided corresponding to each CRT is selected and stored in the address map of the third display control device. The image data in the selected bank area is stored in the selected second frame memory, and the image data stored in the second frame memory is stored in C
Since it is configured to display on the RT, even if a large capacity address space is required, the address space can be efficiently used corresponding to the increase of the CRT and C
There is an effect that it is possible to realize high definition of RT and complexity of graphic processing.

According to the fifth aspect of the present invention, the fourth display control device generates image data, stores the image data in the address map divided into a plurality of bank areas, and displays the image data on the CRT. A bank designation signal for designating a bank area of image data is output, or predetermined copy information is output when copy processing is performed between the bank areas, and the fourth large screen display device controls the fourth display control. Based on the bank designation signal output from the device, the image data of the bank area stored in the address map of the fourth display control device is stored in each second frame memory, and the fourth display control device Based on the output copy information, copy processing between bank areas,
Alternatively, since the image data stored in the second frame memory is configured to be displayed on the CRT, even if a large capacity address space is required, the address space can be used efficiently correspondingly. Therefore, it is possible to increase the number of CRTs, increase the definition of CRTs, and complicate the graphic processing.

According to the sixth aspect of the present invention, the fifth display control device generates image data, stores the image data in the address map divided into a plurality of bank areas, and displays the image data on the CRT. A bank designation signal for designating a bank area of image data is output, or predetermined copy information is output when copy processing is performed between banks of a specific CRT, and the fifth large screen display device displays the fifth The image data of the bank area stored in the address map of the fifth display control device is stored in the respective second frame memories based on the bank designation signal output from the display control device of FIG. Based on the copy information output from the control device, all the second frame memories are assigned to an internal address map, and a specific CR is specified by an external instruction. On whether to copy processing between bank area of the second frame memory which correspond, or, CRT based image data stored in the second frame memory
Since it is configured to display in, even if a large capacity address space is required, the address space can be efficiently used corresponding to the increase in the CRT and the CRT.
There is an effect that it is possible to realize high definition and complicated graphic processing.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a graphic control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram schematically showing a relationship between an address map of a CPU of a display control device and a frame memory of a large screen display device in the graphic control device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram showing a state in which a frame memory in an address map in the CPU of the display control device is allocated in the graphic control device according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a CRT in which 4 pixels of the graphic control device according to Embodiment 1 of the present invention are configured as one data string.

FIG. 5 is a flowchart showing an operation procedure of the graphic control device according to the first embodiment of the present invention.

FIG. 6 is a configuration diagram schematically showing the relationship between the address map of the CPU of the display control device and the frame memory and bank divided frame memory of the large screen display device in the graphic control device according to the second embodiment of the present invention. .

FIG. 7 is a configuration diagram showing a state in which a bank of each frame memory is assigned in an address map in the CPU of the display control device in the graphic control device according to the second embodiment of the present invention.

FIG. 8 is a flowchart showing an operation procedure of the graphic control device according to the second embodiment of the present invention.

FIG. 9 is a configuration diagram schematically showing the relationship between the address map of the CPU of the display control device and the frame memory and bank divided frame memory of the large screen display device in the graphic control device according to the third embodiment of the present invention. .

FIG. 10 is a configuration diagram showing a graphic control device according to a fourth embodiment of the present invention.

FIG. 11 is a configuration diagram schematically showing the relationship between the address map of the display control device and the frame memory of the large screen display device in the graphic control device according to the fourth embodiment of the present invention.

FIG. 12 is a configuration diagram showing a graphic control device according to a fifth embodiment of the present invention.

FIG. 13 is a configuration diagram schematically showing the relationship between the address map of the display control device and the frame memory of the large screen display device in the graphic control device according to the fifth embodiment of the present invention.

FIG. 14 is a configuration diagram showing a relationship between a configuration of a conventional graphic control device and a configuration of a large screen display device.

FIG. 15 is a configuration diagram for explaining an operation of a conventional graphic control device.

[Explanation of symbols]

20 display control device (first display control device), 21 C
PU, 23 address map (address map of external CPU), 30 large screen display device (first large screen display device), 32 frame memory selection unit (first frame memory selection means), 32a CRT channel register (register) ), 33 _{1 to} 33 _n frame memory (first frame memory), 34 _{1 to} 34 _n display means, 35 ₁ to
35 _n CRT, 41 _{1 to} 41 _n banks divided frame memory (second frame memory), 50 display control device (fourth display control device), 60 large screen display device (fourth display device)
Large screen display device), 61 _{1 to} 61 _n drawing control unit (first drawing control unit), 63 _{1 to} 63 _n arbitration unit, 70 display control device (fifth display control device), 80 large screen display device (Fifth large screen display device), 81 Drawing controller (second drawing controller).

Claims (6)

[Claims] 1. A first display control device for generating image data, storing the image data in an address map, and outputting a designation signal for designating a CRT for displaying the image data, and the first display controller. Based on the designation signal output from the control device, the first frame memory provided corresponding to each CRT is selected, and the image data stored in the address map of the first display control device is set to the above-mentioned. A first large-screen display device having a first frame memory selection means to be stored in a first frame memory, and a display means to display the image data stored in the first frame memory on the CRT. Graphic controller. 2. The first frame memory selecting means is the first frame memory selecting means.
2. The graphic control device according to claim 1, further comprising a register for storing a designation signal output from said display control device, and selecting the first frame memory based on the designation signal set in this register. . 3. A second display for generating image data, storing the image data in an address map divided into a plurality of bank areas, and outputting a bank specifying signal for specifying a bank area to be displayed on the CRT. Based on the control device and the bank designation signal output from the second display control device, the image data of the bank area stored in the address map of the second display control device is converted into the second image data of the second display control device. A second large-screen display device having a second frame memory selecting means for storing the image data stored in the second frame memory and a display means for displaying the image data stored in the second frame memory on the CRT. Control device. 4. An image signal is generated, the image data is stored in an address map divided into a plurality of bank areas, and a designation signal designating a CRT for displaying the image data and a bank area displayed on the CRT. A third display controller for outputting a bank specifying signal for specifying
The second frame memory provided corresponding to each CRT is selected based on the designation signal and the bank designation signal output from the third display control device, and the third frame memory is selected.
Third frame memory selecting means for storing the image data of the bank area stored in the address map of the display control device in the selected second frame memory, and stored in the second frame memory. A graphic control device comprising: a third large-screen display device having display means for displaying the image data on the CRT. 5. Whether to generate image data, store the image data in an address map divided into a plurality of bank regions, and output a bank designation signal designating a bank region of the image data to be displayed on the CRT. Or a fourth display control device that outputs predetermined copy information when performing a copy process between the bank areas, and the fourth display control device based on the bank designation signal output from the fourth display control device. Second frame memory selecting means for storing the image data of the bank area stored in the address map of the display control device in the respective second frame memories, and the output from the fourth display control device. Based on the copy information, all banks corresponding to the own second frame memory are assigned to internal address maps, and A plurality of first drawing control units that perform copy processing of the second frame memory, and the second frame memory provided from the fourth display control device and the first drawing control unit. A fourth large-screen display device having an arbitration unit that arbitrates for the read / write request of the above, and a display unit that displays the image data stored in the second frame memory on the CRT. Control device. 6. Whether to generate image data, store the image data in an address map divided into a plurality of bank areas, and output a bank designation signal designating a bank area of the image data to be displayed on the CRT. , Or when performing a copy process between the banks of the specific CRT, based on a fifth display control device that outputs predetermined copy information and the bank designation signal output from the fifth display control device, Second frame memory selecting means for storing the image data of the bank area stored in the address map of the fifth display control device in the respective second frame memories, and output from the fifth display control device. All of the second frame memories are assigned to internal address maps based on the copied information, A second copy processing between the bank areas of the second frame memory corresponding to the specific CRT
And a drawing control unit for the second frame memory, and arbitrates for read / write requests of the second frame memory from the fifth display control device and the second drawing control unit. And the image data stored in the second frame memory to the CRT.
And a fifth large screen display device having a display means for displaying on the graphic control device.