JPH0244078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a display control method and a display control apparatus for a scanning display. More specifically,
The present invention relates to improvements in a display control method and display control device for displaying a large number of moving objects on a scanning display screen using a central processing unit (CPU).

Description of the Prior Art Recently, so-called video game devices that display various characters using a scanning display such as a cathode ray tube (hereinafter abbreviated as CRT) display have been put into practical use. In conventional video game devices, a graphic method and a character method are known as methods for displaying characters on a CRT display. Here, the graphic method directly stores information for identifying multiple moving objects (so-called objects) and other various characters to be displayed in one frame of a CRT display in random access memory (hereinafter referred to as RAM). The contents of the memory are read out and displayed on the CRT display screen. For this reason, the graphics method is also called the direct RAM method. This type of graphics method requires the central processing unit (hereinafter referred to as CPU) of a microprocessor or microcomputer to use most of its processing power to write data to RAM.
The drawback was that the CPU was unable to perform the game processing that was inherent in video game devices, and the game content was restricted. These drawbacks can be overcome by increasing the processing speed of the CPU or by using a CPU dedicated to game control, but this involves the problem of being extremely expensive.

On the other hand, the character method is typified by the invention of ``Method for Displaying a Plurality of Moving Objects on a Video Display Screen'' described in Japanese Patent Laid-Open No. 53-33741. This prior invention of the character method has the advantage that the display can be controlled using a CPU with a low processing speed, and the number of moving objects can be somewhat increased compared to the graphic method. However, this prior invention has the problem that the number of moving objects that can be displayed is about 8 to 32 at most, and it is not possible to display 100 to several hundred moving objects. Furthermore, the prior invention is advantageously used when characters to be displayed on a CRT display are stationary objects such as characters or symbols; It was unsuitable for me. The reason for this is that one character is displayed as a block consisting of multiple dots in the vertical and horizontal directions (for example, 8 x 8 dots), so in order to move the character in each frame, it is necessary to move the character in units of blocks, that is, in units of the number of dots in one block (8). I can only move by. As a result, for those viewing the CRT display, the characters or moving objects appear to move in an extremely unnatural manner, which detracts from the fun of the game.

Summary of the Invention To summarize, the present invention provides a scanning display in which a plurality of relatively large (m x n) dots are arranged in both the horizontal and vertical directions. When we lined up at
A column number is determined for each column, and a row number is determined for each dot in the vertical direction of the CRT display. Then, attribute information of a large number of moving objects to be displayed in the next frame is written into the attribute information storage means during the vertical blanking signal period. During the vertical scanning period of the CRT display, the contents of the attribute information storage means are read out in synchronization with the horizontal scanning. At this time, the line-by-line classification storage unit performs the first stage of classification (sorting) based on the line number representing the vertical position at which the moving object should be displayed, which is included in the read attribute information. The data is written to the row-by-row classification storage section based on the rows. next,
The attribute information of each moving object classified and stored in the row-by-row classification storage section is read out in synchronization with the next horizontal scan, and is read out in the second stage so that it is arranged in a predetermined column number order based on the column number. The classification is performed, and the classified attribute information for each moving object is written into the column-based classification storage section. At this time, the attribute information of the moving object to be displayed in the subsequent horizontal scan is written into the line-by-line classification storage section during the reading period of the attribute information of the moving object to be displayed in the preceding horizontal scan. Similarly, during the write operation, the column-by-column classification storage section reads previously stored attribute information of the moving object to be displayed in one horizontal scanning period. As described above, in this invention, the first stage classification is performed for each horizontal scanning line, that is, for each row number, from a large number of moving objects to be displayed in one frame, and then the second stage classification is performed based on the column number. By repeating the two-stage classification, only the character identification information necessary for one horizontal scanning period is extracted and supplied to the CRT display.

According to this invention, the CPU only writes the attribute information of the moving object to be displayed on the CRT display into the attribute information storage means, and for the rest of the time the CPU performs other processing operations, ie, operations for controlling the game. Therefore, it is possible to control the display of a large number of moving objects using a low-speed CPU.

In a preferred embodiment of the invention, the row and column classification stores each include two buffer memories, which are alternately written and read for each horizontal scan. As a result, two-stage classification is performed based on the row number and column number included in the attribute information of the moving object, so even if the number of moving objects to be displayed in one frame is large, the moving object can be changed by moving dots (that is, pixels) in any direction, vertically or horizontally.

In another preferred embodiment of the present invention, in addition to character identification information as attribute information of a moving target, a symmetrical display signal is provided for displaying a character whose orientation is symmetrical about a vertical axis or a horizontal axis. By adding , several types of character patterns can be displayed from the same character pattern. Thereby, the storage capacity of the memory for generating the character pattern based on the character identification information included in the attribute information of the moving target can be reduced.

In still another preferred embodiment of the present invention, the attribute information of the moving object includes a hue code for identifying the type of hue of the moving object, and the hues are different from each other with the same character color code but different filter colors. characters can be displayed.

In yet another preferred embodiment of the invention,
Even if the display positions of moving objects to be displayed on the screen of a CRT display overlap, the overlapping portion of one of the moving objects can be displayed as if it were overwritten without missing the display.

Therefore, the main object of the present invention is to reduce the burden on the central processing unit for display, reduce the storage capacity of the memory used for displaying moving objects, and to An object of the present invention is to provide a display control method and a display control device for a scanning display capable of displaying images.

Another object of the present invention is to provide a display control method and a display control device for a scanning type display, which can control the display of a large number of moving objects on the screen of a CRT display using a relatively slow and inexpensive CPU. It is to provide.

Still another object of the present invention is to make it possible to smoothly move a large number of moving objects using an inexpensive CPU, without causing the moving objects to move unnaturally, and to perform scanning suitable for video game devices. An object of the present invention is to provide a display control device for a shaped display.

Still another object of the present invention is to be able to display characters having the same shape and having shapes symmetrical about a horizontal axis or a vertical axis based on one character pattern information, and to store character patterns. An object of the present invention is to provide a display control device for a scanning type display that can reduce the storage capacity of a memory for displaying the data.

Still another object of the present invention is to store information on one type of colored character pattern when displaying a character such as a moving target in color, so that a filter of a different hue can be applied. An object of the present invention is to provide a display control device for a scanning display capable of displaying characters with different hues.

The above objects and other objects and features of the invention will become more apparent from the detailed description below with reference to the drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the principle of the display control method and display control device for a scanning display according to the present invention. In the configuration, the display control device of this embodiment includes an attribute information generation circuit 10, a row-based classification storage/readout circuit 20 as an example of the first storage means, and a column-based classification storage/readout circuit 30 as an example of the second storage means.
including. The attribute information generation circuit 10 includes a moving object storage memory (hereinafter referred to as memory) 11, which is an example of attribute information storage means. This memory 11 has at least
It has a storage capacity for storing attribute information of each moving object corresponding to the maximum number of moving objects to be displayed in one frame of a CRT display. here,
A moving target is a moving object such as an airplane or an animal whose display position is changed so as to move on the game, and is also referred to as an object. The attribute information of the moving object includes at least a row number and a column number for indicating the display position of the moving object, and character identification information for identifying the type of the moving object.

The row-based classification storage/readout circuit 20 includes a switching circuit 2
1a, 21b and row buffer memories 22a, 2
Contains 2b. Here, the row buffer memory 22a,
The storage capacity 22b is selected to have a storage capacity that can store the attribute information of the maximum number of moving objects that can be displayed in one horizontal scanning period.

The column-by-column classification storage readout circuit 30 includes a switching circuit 31
a, 31b, column buffer memories 32a, 32b, and an output switching circuit 33. Here, the column buffer memories 32a and 32b store display data based on at least character identification information included in the attribute information of the maximum number of moving objects that can be displayed in one horizontal scanning period, that is, each dot of one horizontal scanning line (for example, It has the storage capacity necessary to store a luminance signal or color signal of 256 dots. The output of the output switching circuit 33 is given to a display unit 40. Here, the display unit 40 is a CRT display 4.
Contains 1. Details of the screen of this CRT display 41 will be described later in FIG. 2.

FIG. 2 is a diagram schematically showing the screen of the CRT display 41. As shown in FIG. If the conventionally well-known CRT display 41 is of the progressive scanning type,
It is divided into a relatively large number of dots in the vertical and horizontal directions (for example, when m in the horizontal direction and n in the vertical direction, m x n = 256 x 256), and one dot is It is determined as the minimum display unit pixel.

By the way, in the conventional character method, one character has a relatively small number of characters in each of the horizontal and vertical directions (for example, when the horizontal direction is x and the vertical direction is y, x x y = 8 x 8). If it is made up of dots, the horizontal direction is divided into m/x columns and n/y rows, and one block (or Characters were displayed in units of squares. For this reason, in the conventional character method, when moving one character horizontally, vertically, or diagonally, it can only be moved in block units, so it can only be displayed at a position moved eight dots at a time, and one character can only be moved in blocks. It was not possible to move the moving object displayed smoothly.

In contrast, in the present invention, a relatively large number of dots (m×n) are arranged in the horizontal and vertical directions of the CRT display 41, and each dot in the horizontal direction is sequentially arranged in the scanning direction of the horizontal scanning line. Set column numbers 0 to 255. On the other hand, in the vertical direction, line numbers (0 to 255) are sequentially determined in the vertical scanning direction for each horizontal scanning line for displaying each frame.

Next, the principle of the invention will be explained with reference to FIGS. 1 and 2. In the memory 11, attribute information of each moving object to be displayed in the next frame during the vertical blanking signal period is written. The attribute information of each moving object to be displayed in one frame written in the memory 11 is read out in synchronization with the horizontal scanning of the CRT display 41, and is applied to the switching circuits 21a and 21b. The switching circuits 21a and 21b alternately transfer the output of the memory 11 to the corresponding row buffer memory 22a every horizontal scan.
Or switch to give it to 22b. For example, during the scanning period of odd-numbered horizontal scanning lines, the read data of the memory 11 is transferred to the row buffer memory 22b.
If the data is written to the row buffer memory 22a, the contents written in the row buffer memory 22a during the scanning period of the immediately preceding horizontal scanning line (even-numbered horizontal scanning line) are read out.
For that purpose, the switching circuits 21a and 21b alternately select the output of the memory 11 for each horizontal scanning line and select the output of the corresponding row buffer memory 22a and 22, respectively.
give to b. Here, the row buffer memory 22a,
22b determines the number of horizontal scanning lines and the line number based on the number of the horizontal scanning line of the CRT display 41 and the line number included in the attribute information of each moving object read from the memory 11. When there is a predetermined relationship, data excluding the line number included in the attribute information (ie, remaining data) is stored for each moving target.

During the horizontal scanning period when the row buffer memory 22b is in the write state, the row buffer memory 22a is in the read mode. At this time, the changeover switch 31a switches the output of the row buffer memory 22a to the column buffer memory 32a. Then, the attribute information for each moving object output from the row buffer memory 22a read in synchronization with the horizontal scanning is rearranged in the order of column numbers and written to the column buffer memory 32a. At this time, the changeover switch 31b disconnects the row buffer memory 22b and the column buffer memory 32b so that the output of the row buffer memory 22b is not applied to the column buffer memory 32b. At this time, the output switching circuit 33 is switched to the column buffer memory 32b side. Therefore, the content stored in the column buffer memory 32b (that is, the content stored two horizontal scanning lines before the horizontal scanning line data corresponding to the row number written in the row buffer memory 22b) is transferred to the output switching circuit 33. The image is applied to the display unit 40 via the CRT display 41 and displayed on the CRT display 41.

That is, in the present invention, during the scanning period of the odd-numbered horizontal scanning line, each changeover switch 21a, 2
1b, 31a, 31b, 33 are switched as shown in FIG.
b writes the output of the memory 11, the column buffer memory 32a writes the output of the row buffer memory 22a, and the read data of the column buffer memory 32b writes
displayed on the CRT display 41. On the contrary, during the horizontal scanning period of the even-numbered horizontal scanning line (that is, when the row number information is an even number), each changeover switch 21a, 21b, 31a, 31b,
33 are connected in the opposite way to that shown in the drawing. Therefore, during the scanning period of horizontal scanning lines with even row numbers, a part of the readout output of the memory 11 is written to the row buffer memory 22a, and the contents of the row buffer memory 22b are read and stored in the column buffer memory 3.
2b, and the contents of the column buffer memory 32a are displayed on the CRT display 41. That is, in this invention, the attribute information of the moving object for one frame is stored in the row buffer memory 22b alternately for each horizontal scanning line based on the row number.
or rear column buffer memory 32a or 3 in which the contents of the row buffer memory 22a or 22b which are not in write mode are classified and stored in the column buffer memory 22a or 22a, and the contents are sorted based on column numbers and rearranged in the order of column numbers.
2b. In other words, the attribute information of one frame of moving objects stored in the memory 11 is based on the vertical position of the horizontal scanning line being scanned at that time and the line number included in the attribute information of each moving object. A first stage classification is performed based on the column number, and a second stage classification is then performed based on the column number.
They will be displayed in the arranged order after two stages of classification.

Next, specific embodiments of the present invention will be described.

FIG. 3 is a specific circuit diagram of an embodiment of the present invention. In particular, FIG. 3A shows the attribute information generation circuit 10.
FIG. 3B shows details of the row-by-row classification storage/readout circuit 20 and the control signal generation circuit 50,
FIG. 3C shows a column classification storage/readout circuit 30, a display unit 40, and a character pattern generation circuit 60.
Show details.

FIG. 4 is a diagram schematically showing the storage area of the moving object storage memory (hereinafter referred to as memory) 11 in relation to horizontal scanning.

5A to 5C are diagrams schematically showing character display states for explaining the operation of FIG. 3, and in particular, FIG. 5A is a diagram for explaining a display based on a hue code, FIG. 5B shows a symmetrical character pattern, and FIG. 5C shows an overlapping display state.

Next, with reference to FIGS. 3 to 5C, the specific structure and operation of each part in FIG. 3 will be explained.

The attribute information generation circuit 10 includes a memory 11, a central processing unit (CPU) 12, an address data switching circuit 13, an input/output switching circuit 14, and a latch circuit 15.
including. This memory 11 has a storage capacity (for example, 1k×4 bits) necessary to store attribute information for the maximum number of moving objects that can be displayed in one frame of the CRT display 41. In the designed version, the format name is used as memory 11.
HM6148P-6 (manufactured by Hitachi) C-MOS memory is used. The access time of this memory 11 is
It is 85nsec. By the way, the attribute information of the moving object stored in the memory 11 includes, for example, a row number (8 bits), a column number (8 bits), and character identification information (9 bits) for specifying the coordinate position where the moving object should be displayed. bit) and control data (5 bits). The control data is called a control code, and includes an erasure code (1 bit), a hue code (2 bits), a horizontal axis (i.e., X axis) symmetrical code (1 bit), and a vertical axis (Y axis). Contains a symmetric code (1 bit).

Here, the erasure code is also referred to as an object live signal, and is a code indicating whether the display of a moving object should be activated or deactivated. A hue code is a code that assigns a hue or tone to a character whose color is predetermined by a character pattern generated from a character pattern generation circuit 60, which will be described later, as if a color filter of an apparently different color was applied. This is data for change. For example, when displaying an airplane as an example of a moving object as shown in FIG. 5A, if the body, wings, and background of the airplane are displayed in different colors, the character storage memory 61, which will be described later, A color code is stored for each dot of one character pattern. Then, the character pattern information is displayed in a composite color based on the hue code, as if it had been applied with four types of color filters. The horizontal axis symmetry code and the vertical axis symmetry code command to display the shape of the character pattern stored in the character storage memory 61 in a shape symmetrical to the horizontal axis (X axis) or the vertical axis (Y axis), respectively. used for. For example, if a certain character stored in the character storage memory 61 is F (that is, the character shown in the first quadrant of FIG. 5B), both the horizontal axis symmetric code and the vertical axis symmetric code are logic "0". 5B, the character pattern is displayed in its original shape as shown in the first quadrant of FIG. When only the symmetrical code is logic ``1'', the display is commanded as shown in the pattern shown in the fourth quadrant, and when both the horizontal axis symmetrical code and the vertical axis symmetrical code are logical ``1'', the display is commanded as shown in the pattern shown in the third quadrant. to be displayed.

The CPU 12 is relatively inexpensive and does not have high processing speed (for example, the operating clock frequency is 4MHz), and is
Z80A (manufactured by ZILOG) is used. This CPU12
For example, data for a plurality of frames to be displayed in one game of a video game device is stored in advance, and the write data of the memory 11 is given to the input/output switching circuit 14, and the write address is set as address data. It is applied to the switching circuit 13. Switching circuit 1
3 gives write address data from the CPU 12 as address data to the memory 11 during a period when a vertical blanking signal (hereinafter abbreviated as VB signal) is given, and when there is no VB signal, a television synchronization counter 51 (described later) The horizontal scanning address data given from the memory 11 is given as read address data. On the other hand, the switching circuit 14 supplies the write data output from the CPU 12 to the memory 11 during the period when the VB signal is applied, and supplies the data read from the memory 11 to the latch circuit 15 when the VB signal is not present. That is, the memory 11 is
During the VB signal period, attribute information of multiple moving objects to be displayed in one frame is written, and during the non-VB signal period (that is, during the horizontal scanning period of the CRT display 41), the written data is synchronized with the horizontal scanning. Read out.

By the way, when writing one frame's worth of attribute information of a moving object to the memory 11, it is preferable to write it discontinuously to each address of the memory 11, rather than writing it continuously to each address of the memory 11, for the purpose of sharing the television synchronization counter. write to. FIG. 4 is a diagram illustrating a preferred example of writing attribute information of a moving target into the memory 11. For example, if consecutive addresses (for example, 0, 1, ~21...) are assigned to each storage area of the memory 11, each moving object OB1, OB2,... will be written by skipping the storage area at the address indicated by diagonal lines. . In other words, for each number of moving objects, 1
Blank data (for example, all bits 0) is written for the address. The reason for this is that when specifying the readout address of the memory 11, a special counter for temporarily stopping the readout time must be provided separately from the horizontal synchronization counter included in the TV synchronization counter 51, or synchronization is required with the output of the horizontal synchronization counter. This is to utilize the access time of writing blank data at each address in the memory 11 and reading out the address of the blank data. For this purpose, in this embodiment, blank data is written at addresses 3 and 11 in the memory 11, and every eight addresses thereafter. The reason is that the read timing of the address where blank data is written is
This is also the read timing of the row buffer memory 22a or 22b, so even if blank data is read, its contents are ignored and do not affect the read output of the row buffer memory 22a or 22b. In order to clarify this operating state, FIG. 4 compares and shows the relationship between data read out by addressing the memory 11 and horizontal scanning.
In other words, when the vertical direction is the horizontal scanning time, ○
The portion indicated by the mark is the read period of the memory 11 and the write period of either the row buffer memory 22a or 22b. Since the portion marked with x is a period in which blank data is read from memory 11, reading from either row buffer memory 22a or 22b is performed at this time. In this way, the maximum number of moving objects that can be displayed in one horizontal scanning period (for example, 32) can be read out in one
This is done for each horizontal scanning line.

The read data of the memory 11, that is, the attribute information of one moving object, is provided to the latch circuit 15. The latch circuit 15 holds the attribute information of one moving object for a certain period of time, provides the line number included in the attribute information to the comparator 23 included in the line-by-line classification storage/readout circuit 20, and also Various data except numbers are stored in the row buffer memory 22.
a, 22b as write data. Furthermore, the latch circuit 15 provides an erase code (that is, an all-bit 0 code) to the row buffer memories 22a and 22b based on input of an erase code generation command signal from an erase control signal generator 53, which will be described later. Further, the latch circuit 15 supplies an X-axis symmetry display signal to an X-axis symmetry code generator 24, which will be described later, based on the fact that the held attribute information includes an X-axis symmetry display signal.

Next, details of the row-by-row moving object buffer memory storage/readout circuit 20 will be explained. Row buffer memory 22
a and 22b have a storage capacity to store the remaining data excluding the line number among the attribute information for the maximum number (32) of moving objects that can be displayed in one horizontal scanning period. Such a row buffer memory 22
Bipolar memories such as MB7063 (manufactured by Fujitsu) are used for a and 22b. this
The MB7063 has a storage capacity of 64 x 9 bits and an access time of 45 nsec. The row buffer memory 22a or 22b is supplied with address data output from the corresponding address switching circuit 21a or 21b, respectively. Switching circuit 21a, 2
1b, the horizontal scanning address output from the television synchronization counter 51 is given as read address data, and the count value of the row selection counter 26 is given as write address data. A scan switching signal is applied to the switching circuit 21a and the row buffer memory 22a from a scanning switching signal generator 52, which will be described later.
When the scan switching signal is high level, switching circuit 2
1a selects the write address, and the row buffer memory 22a enters the write mode. On the other hand, the switching circuit 21
A scan switching signal is inverted by an inverter 27 and applied to the row buffer memory 22b and the row buffer memory 22b. Therefore, when the scan switching signal is at a low level, the switching circuit 21b selects the write address and the row buffer memory 22b enters the write mode. Here, the scan switching signal is a signal that alternately repeats a high level and a low level for each horizontal scanning line, and for example, when the line number corresponding to the horizontal scanning line is an even number, it is a high level, and when the line number corresponding to the horizontal scanning line is an odd number, it is a low level. Become. Therefore, the switching circuits 21a and 21b are 1
A write address and a read address are alternately selected for each horizontal scanning line. In other words, when one of the row buffer memories 22a and 22b is in the write mode, the other is in the read mode, and the write mode and read mode are switched for each horizontal scanning line.

The comparator 23 functions as a predetermined relationship detecting means for detecting that there is a predetermined relationship between the vertical scanning address of the CRT display 41 and the line number included in the attribute information. That is, the comparator 23 has
A vertical scanning address synchronized with the vertical scanning of the CRT display 41 is given from a television synchronization counter (hereinafter referred to as a synchronization counter) 51. Comparator 23 constantly compares the row number given from latch circuit 15 and the vertical scanning address. Here, both the row number and vertical scanning address are 8 bits,
When the upper five bits match, it means that the line number addition data (hereinafter referred to as ΔV data) of the character pattern for representing one moving object is within the range of 0 to 7. Therefore, when the row number and the upper 5 bits of the vertical scanning address match, the comparator 23 derives a row selection write pulse and applies it to the OR gate 25, and then passes it through the OR gate 25 to the row buffer memories 22a, 22b.
give to Furthermore, when the row number and the upper five bits of the vertical scanning address match, the comparator 23 supplies difference data between the respective values represented by the lower three bit codes to the X-axis symmetrical code generator 24. When there is no X-axis symmetric display signal, the X-axis symmetric code generator 24 supplies the difference data given from the comparator 23 to the row buffer memories 22a and 22b as ΔV data. Here, the ΔV data is a number (ie, 0 to 7) that is less than or equal to the number of dots in the vertical direction of the character of one moving object. When this ΔV data is 0, it indicates that when the number of dots in one character is 8×8 dots in the vertical and horizontal directions, the contents of one row in the upper left horizontal direction are to be read out.
On the other hand, when the X-axis symmetrical code generator 24 receives the X-axis symmetrical display signal (high level) from the latch circuit 15, it generates a value obtained by subtracting the difference data (0 to 7) of the output of the comparator 23 from the numerical value 7. is derived as ΔV data. As a result, when the X-axis symmetrical display signal is input, the reading order of each row of one character stored in the character storage memory 61 (described later) is reversed.

As the row selection synchronous counter (hereinafter referred to as synchronous counter) 26, for example, a 32-decimal counter is used. The synchronization counter 26 returns its count value to the initial state in response to input of 32 erase pulses generated from the erase control signal generator 53 (described later) via the OR gate 25 during the first half of the vertical blanking signal period. clear. And the synchronization counter 26
increments the count value each time the comparator 23 derives a row selection write pulse during the horizontal scanning period,
The count value is given to the switching circuits 21a and 21b as write address data. In addition, synchronous counter 2
6 starts counting from 1 again when row selection write pulses 25 equal to or greater than the maximum number of column numbers (32) are applied in one horizontal scanning period. Therefore, even if attribute information for displaying 32 or more moving objects is output from the memory 11 in one horizontal scanning period, the row buffer memory 22a or 22b
stores the attribute information of the most recently inputted moving object up to 32 pieces ago, and does not store any of the attribute information of the moving objects inputted before that. In other words, the row buffer memories 22a, 22
b is a buffer memory in a first-in, first-out manner.
The read output of either row buffer memory 22a or 22b is applied to latch circuit 28 and held there.

Next, details of the control signal generation circuit 50 will be explained. The control signal generation circuit 50 includes a television synchronization counter 51. This synchronous counter 51 is
Horizontal scanning address data is generated in synchronization with the horizontal scanning state of the CRT display 41, that is, the horizontal position of the electron beam, and is applied to the switching circuits 13, 21a and 21b as read address data. Further, the synchronization counter 51 generates vertical scanning address data in synchronization with the vertical position of the horizontal scanning line of the CRT display 41, that is, the scanning position corresponding to the line number, and supplies it to the comparator 23. Further, the synchronization counter 51 provides a horizontal blanking signal (HB signal) to the scan switching signal generator 52, and also provides a timing signal including the HB signal to the erasure control signal generator 53. The scan switching signal generator 52 generates a scan switching signal that alternately switches between high level and low level every horizontal scan. As such a scan switching signal generator 52, for example, a flip-flop is used which switches its output logic level between a high level and a low level each time a horizontal blanking signal is input. The erase control signal generator 53 generates a number of erase pulses corresponding to the maximum number of column numbers (32) in a period shorter than the HB signal period from the start of the HB signal and supplies them to the OR gate 25, and also generates an erase code. An activation signal is provided to latch circuit 15. This is to erase the contents of the row buffer memory 22a or 22b which will be in the write mode next during the HB signal period. That is, when the erase code generation activation signal is applied, the latch circuit 15 supplies the erase code (all bits 0) to the row buffer memories 22a and 22b as write data. At this time, 32 erase pulses are sequentially applied to the synchronization counter 26. Therefore, every time the count value of the synchronization counter 26 increments from 1 to 32, that count value is applied as write address data to the row buffer memory 22a or 22b which will be in the write mode in the next horizontal scanning period.
As a result, all-bit 0 data (erase code) is sequentially written into the address specified by the synchronization counter 26 in the row buffer memory which will be in the write mode in the next horizontal scan.

Control signal generation circuit 50 further includes an erasure signal generator 54 and a Y-axis symmetrical command signal generator 55. When the electron beam is horizontally scanning, the synchronization counter 51 scans the position of the leftmost dot assigned by each column number.
Erasure signal generator 54 generates a timing pulse
and the Y-axis symmetrical display signal generator 55. Every time a timing pulse is applied, the erasure signal generator 54 determines whether the erasure code inputted from the latch circuit 28 is a signal representing erasing the display state of one moving object, and determines whether or not the display state of one moving object is erased. The erasure signal is derived based on the fact that the signal represents the signal. Each time a timing pulse is applied, the Y-axis symmetrical display signal generator 55 determines whether the Y-axis symmetrical code provided from the latch circuit 28 is a signal (logic "1") indicating that Y-axis symmetrical display is to be performed. ,
Based on the Y-axis symmetrical display signal, a signal for reversing the readout shift direction of the character pattern is applied to a parallel-to-serial converter 62, which will be described later. For example, the Y-axis symmetrical display signal generator 55 derives a signal (for example, low level) to shift the Y-axis symmetrical display signal to the right if it is not a Y-axis symmetrical display signal, and a signal (for example, high level) to shift the Y-axis symmetrical display signal to the left. Derive. Furthermore, the synchronization counter 51 generates a shift clock pulse every time the horizontal scanning line advances one dot in the horizontal direction, and a parallel-to-serial converter 62 (described later) generates a shift clock pulse.
and is applied to the color code converter 42.

Next, details of the column-by-column classification storage/readout circuit 30 and related circuits will be described. The column-by-column classification storage/readout circuit 30 includes column buffer memories 32a and 3.
Contains 2b. This column buffer memory 32a, 32
b stores character patterns based on attribute information of a moving object to be displayed in one horizontal scanning period for each column number, and stores data representing characters to be displayed in one horizontal scanning line in one horizontal scanning line. It is stored or read out alternately. As such column buffer memories 32a and 32b,
Bipolar memory with a storage capacity of 256 x 5 bits and an access time of 35 nsec is used,
The prototype used the model name F93422 (manufactured by Fairchild). In the column buffer memories 32a and 32b,
Write data is applied from write data switching circuits 31a and 31b, respectively, and read address data is applied from address data switching circuits 37a and 37b. The switching circuits 31a and 31b alternately select the hue code and the character color code or the erase code as write data every time the logic state of the scan switching signal is inverted, in other words, every horizontal scanning line.

The character color code is generated from a character pattern information generation circuit 60. The character pattern generation circuit 60 includes a character storage memory (hereinafter referred to as memory) 61 and a parallel-to-serial converter 62.
including. The character storage memory 61 stores data for displaying character patterns for each type of character specified by a character code. For example, if one moving target is displayed as 8 x 8 dots, each dot has 3
Memorize color codes in bits. Then, which row (row from the top) of each horizontal dot is to be read out is determined based on the ΔV data. That is, when the ΔV data is 0 to 7, the memory 61 is
Data for 8 dots in the horizontal direction of each of the 1st to 8th rows in the vertical direction is read out in parallel bits. The parallel-to-serial converter 62 converts data for 8 dots in the horizontal direction (8 dots x 3 bits) of the character pattern corresponding to one moving object given from the character storage memory 61 based on the shift direction signal. Each dot is converted into 3-bit serial data. Specifically, a character pattern that is symmetrical about the Y-axis is read out by reversing the shift direction for converting to serial data when there is no Y-axis symmetrical display signal and when there is a Y-axis symmetrical display signal.

The switching circuits 37a and 37b each have a corresponding column selection synchronization counter (hereinafter referred to as a synchronization counter).
Read address data based on column numbers are input from 34a and 34b, and a horizontal scanning address is input from the synchronization counter 51. The synchronization counters 34a and 34b are activated only when a high level is applied from the corresponding AND gates 35a and 35b, respectively. The AND gate 35a activates the synchronization counter 34a when the erasure signal is logic "1" (that is, when the moving object designated by the column number is to be displayed) and when the scan switching signal is at a high level. On the other hand, the AND gate 35b activates the synchronization counter 34b when the erasure signal is logic "1" and the scan switching signal is at a low level. Synchronous counter 34a, 3
4b is given the column number of one moving object from the latch circuit 28. Activated synchronous counter 3
4a or 34b are mutually synchronized with the same shift clock provided to parallel-to-serial converter 62. To this end, the column number of one moving object is output from the latch circuit 28 to the currently activated synchronization counter 34a or 34.
In response to the input to b, the synchronization counter 3
From then on, 4a or 34b generates write addresses for 8 counts in synchronization with shifting the data for 8 dots in the horizontal direction of the character color code output from the parallel-to-serial converter 62.

Next, the column-by-column classification memory readout circuit 30 reads out the row-by-row moving objects read out from the row-by-row classification memory and readout circuit 20.
The case of sorting into column numbers in the scanning order of horizontal scanning lines so that they can be displayed on the CRT display 41 will be explained. For example, when the scan switching signal is high level, the switching circuits 31a, 31b, 37a, 37b
are respectively switched to the illustrated states. That is, the column buffer memory 32a is in the write mode, and the column buffer memory 32b is in the read mode. In this case, the column buffer memory 32b is connected to the switching circuit 37.
A read address is designated based on the horizontal scanning address given from b, and the content of the designated address, that is, the character pattern is given to the switching circuit 33. At this time, the column buffer memory 32b writes an erase code, that is, an all-0 code, to the same address immediately after data is read, thereby erasing the stored contents. On the other hand, when a column number representing the horizontal display position of one moving object is inputted from the latch circuit 38, the synchronization counter 34a transfers the write address based on the column number to the column buffer memory via the switching circuit 37a. 32a. The column buffer memory 32a writes the hue code and character color code given from the switching circuit 31a to the designated write address. Similarly, each time the latch circuit 28 derives the column number and hue code of the moving object to be displayed in the next horizontal scanning period, and the character pattern generation circuit 60 derives the character code, the column buffer memory 32a stores the hue code and character color code at the address corresponding to the column number.

Then, when one horizontal scanning period ends and a horizontal blanking period begins, the logic state of the scan switching signal is inverted and becomes a low level. Therefore, during the next horizontal scanning period, the column buffer memory 32b is in the write mode, and the column buffer memory 32b is in the read mode. In this case, character patterns for each column number of the moving object to be displayed in the next horizontal scanning period are written in the column buffer memory 32b in the same manner as in the above-described operation, and
The contents of a are read.

The switching circuit 33 switches the column buffer memory 32a or 32 every time the logic state of the scanning switching signal is inverted.
The readout outputs of b are alternately switched and derived and applied to a color code converter 42 included in the display unit 40. The color code converter 42 is connected to the column buffer memory 32.
CRT display 41 based on the color code of the character pattern read from a or 32b.
A color signal for color display is derived and applied to the CRT display 41 via the television interface 43. Next, a more specific operation of this embodiment will be explained.

FIG. 6 is a time chart showing the relationship between the vertical blanking signal (VB signal) and the operating state of the CPU 12 during one frame period.

FIG. 7 shows the horizontal blanking signal (HB signal) and each buffer memory 22a, 22b, 32a, 32.
3 is a time chart showing the relationship between the operation mode of FIG.

FIG. 8 is a time chart for explaining the operating state of the row-based classification storage/reading circuit 20.

FIG. 9 is a time chart for explaining the operating states of the row-by-row classification storage and readout circuit 20 and the column-by-column classification storage and readout circuit 30.

Next, the specific operation of this embodiment will be explained with reference to FIGS. 1 to 9. For example, as shown in Figure 2, 30 moving objects OB are detected in one horizontal period.
The case where 1, OB2, OB3, ... OB30 are displayed will be explained. In this case, the position on the screen where each moving object should be displayed is the first moving object.
OB1 is located at row numbers 3 to 10 and column numbers 8 to 15, and the second moving object OB2 is located at row numbers 5 to 12.
and row numbers 16 to 23, and the third moving object
Assume that OB3 has row numbers 3 to 10 and is displayed in column numbers 24 to 31. Note that the other moving objects OB4 to OB30 are shown only in the time chart of FIG. 9, and are omitted to simplify the explanation of their operations. In this case, when storing the moving objects OB1 to OB3 in the memory 11,
The row number of OB1 is 1, the column number is 8, and the moving target
Set the row number of OB2 to 3, the column number to 16, and move the object.
Store the row number of OB3 as 1 and the column number as 24. This means that in this embodiment, the contents of the line numbers stored in the memory 11 are displayed on the CRT display 41.
This is because there is a delay of two horizontal scanning lines before the image is displayed.

Under the above conditions, the CPU 12 performs the operations shown in the time chart of FIG. 6 during one vertical scanning period of the CRT display 40. That is, the CPU 12 outputs a vertical blanking signal (VB
During the period (signal), buffer memory for a large number of moving objects to be displayed in one frame is stored in the memory 11.
write to. Then, when the VB signal becomes low level, the CPU 12 executes the game program regardless of the read operation of the memory 11. At this time, the stored contents of the memory 11 are read out based on the horizontal scanning address and latched by the latch circuit 15.

For example, in the horizontal scanning period of row number 0, the attribute information of the moving object to be displayed in the horizontal scanning period corresponding to row number 2 is read. At this time, since there is no moving target to be displayed during the horizontal scanning period corresponding to line number 2, no writing is performed. Then, during the HB signal period of one horizontal scanning time corresponding to row number 1, the scan switching signal generator 52 first sets the scanning switching signal to a low level. Therefore, during one preceding horizontal scanning time, as shown in FIG. 7, the row buffer memory 22b and column buffer memory 32a are in the write mode, and the row buffer memory 22a and column buffer memory 32b are in the read mode. Now, one previous horizontal scanning time
Assuming the case of the HB signal period, the erase control signal generator 53 is activated in the first half of the high level of the HB signal.
generates 32 erase pulses and also generates an erase code generation enable signal. Therefore, the latch circuit 15 derives an erase code (all bits 0) and supplies it to the row buffer memory 22b. At this time, the synchronization counter 26 increments its count value each time an erase pulse is input, and provides the count value as a write address to the row buffer memory 22b via the switching circuit 21b, so that the contents of the row buffer memory 22b are cleared. Ru. After the time required to erase the contents of all addresses in the row buffer memory 22b has elapsed, the erase control signal generator 53 stops its output. In response, the latch circuit 15 temporarily holds the attribute information of one moving object to be read from the memory 11 thereafter. Note that reading from the memory 11 is performed based on horizontal scanning addresses;
It is assumed that all addresses of a large number of moving objects stored in the memory 11 are specified by a horizontal address given in one horizontal scanning period.

Now, for example, when the row number (for example, 1) of the moving object OB1 is read, the comparator 23 derives one row selection write pulse and also sets 0 as the data of the difference between the vertical scanning address and the row number. It is derived and given to the X-axis symmetrical code generator 24. In response, the synchronization counter 26 counts a value of 1 and specifies the address in the row buffer memory 22b where the first moving object is to be stored. Therefore, the row buffer memory 22b stores the column number (8), character code, hue code, and control code of the moving object OB1 at the address where the first moving object is to be stored. Here, the control code includes ΔV data, erasure code, and Y-axis symmetric code. At this time, if the attribute information of the moving object OB1 does not include an X-axis symmetry display signal, the ΔV data is 0. Further, the Y-axis symmetry code is also 0 if there is no Y-axis symmetry. Subsequently, the attribute information of the moving object OB2 is read from the memory 11. However, the comparator 23 selects a row because the row number of the moving object OB2 does not have a predetermined relationship with the vertical scan address, that is, the row number is not equal to the vertical scan address or larger than the vertical scan address by 1 to 7. Do not derive write pulses. Therefore, the attribute information of the moving object OB2 is not written to the row buffer memory 22b. Next, the moving target
When the attribute information of OB3 is read from the memory 11, the comparator 23 derives a row selection write pulse in the same manner as for the moving object OB1. For this reason,
The column number, hue code, character code and △V data of the moving target OB3 are stored in the row buffer memory 2.
2b is written to the address where the second moving target is stored. Thereafter, in the same way, during the horizontal scanning period corresponding to row number 1, attribute information of a plurality of moving objects to be displayed during the horizontal scanning period corresponding to row number 3 is written into the row buffer memory 22b.

Note that during the horizontal scanning period corresponding to row number 1, the row buffer memory 22a is in the read mode and the column buffer memory 32a is in the write mode, but the read data of the row buffer memory 22a is meaningless data (that is, all bits 0). Therefore, no writing is performed.

Next, at the timing when the horizontal scanning period corresponding to row number 2 has arrived, the scanning switching signal generator 52
derives a high level scan switching signal. In response, switching circuits 21a and 37b select the write address, and switching circuits 21b and 37a select the read address. Also in the horizontal scanning period corresponding to row number 2, the contents of the row buffer memory 22a are erased in the first half of the HB signal. Then, the attribute information of the moving object OB1 is read out from the memory 11 and temporarily held in the latch circuit 15.
Accordingly, the comparator 23 derives a row selection write pulse, and also outputs the numerical value 1 as the difference data between the row number and the vertical scanning address to the X-axis symmetrical code generator 24.
give to In response, the X-axis symmetrical code generator 24 derives 1 as ΔV data and supplies it to the row buffer memory 22a. At this time, the synchronization counter 2
6 has been reset to the initial state by 32 erase pulses, so the count value is set to 1 in response to the first row selection write pulse, and the write address is set to memorize the first moving object. address. Therefore, the character code, column number, hue code, ΔV data (1) and Y to be displayed in the horizontal scanning period corresponding to row number 4 of moving target OB1.
The axially symmetrical code is written to the address in the row buffer memory 22 where the data of the first attribute information is to be stored. Thereafter, in the same manner, the row buffer memory 22a
The character code, column number, hue code, and ΔV data (1) of the moving object OB3 are stored. Here, the fact that the ΔV data is 1 means that of the character codes of the moving objects OB1 and OB3, a character pattern corresponding to 8 dots in the horizontal direction in the second row from the top is specified.

On the other hand, during the horizontal scanning period corresponding to row number 2, the contents of the row buffer memory 22b are read out in synchronization with the horizontal scanning address. That is, the attribute information of one moving object is read every time the electron beam scans a period corresponding to the number of horizontal dots (8) in one row. During this period, the latch circuit 28 latches the read data from the row buffer memory 22b. This state is shown in FIG. now,
Assuming that the attribute information of the moving object OB1 is held in the latch circuit 28, the character storage memory 61 stores row number 3 based on the character code of the moving object OB1 and the ΔV data (=0). The character pattern to be displayed in column number 8 during the horizontal scanning period is read out, and the parallel-serial converter 62
give to The character color code and hue code are combined and written into the storage area corresponding to column number 8 of the column buffer memory 32b via the switching circuit 31b. Subsequently, the attribute information of the moving object OB3 is read out from the row buffer memory 22b and latched by the latch circuit 28. Accordingly, the character color code to be displayed during the horizontal scanning period of row number 3 of the moving object OB3 is read out from the memory 61, combined with the hue code, and written into the area of the column buffer memory 32b corresponding to column number 24. It will be done.

Next, in the horizontal scanning period corresponding to row number 3, each switching circuit 21a, 21b, 31a, 3
1b, 37a, 37b, and 33 are respectively switched. In response, row buffer memory 22b and column buffer memory 32a are placed in write mode, and row buffer memory 22a and column buffer memory 32b are placed in read mode. The operations of the row buffer memories 22a, 22b and column buffer memory 32a in this case are the same as those in the case where the horizontal scanning lines correspond to odd row numbers, and will therefore be omitted. At this time, when the electron beam scans between row numbers 8 to 15, the character pattern of the moving object OB1 is read out from the row buffer memory 32b. When the electron beam scans between row numbers 24 to 31, the moving object OB3 is transferred from the row buffer memory 32b.
character pattern is read out.

As described above, the row buffer memories 22a, 22
b read or write operation and column buffer memory 32
The read or write operations of 32b and 32a are performed alternately for each horizontal scanning line.

By the way, the switching circuit 33
Column buffer memory 32a or 32 for each line
The readout outputs of b are alternately switched and derived and applied to the color code converter 42. Here, the information read from the column buffer memory 32a or 32b is a 3-bit character color code and 2-bit hue information for each dot of one character, as described above. Therefore, the color code converter 42
Each time the electron beam on the CRT display 41 moves one dot in the horizontal direction, that dot is colored based on the character color code, and the hue is colored as if four types of filters were applied based on the hue code. change. For example, the 5th A
When displaying the character of an airplane as shown in the figure, if the fuselage color is red, the wing color is blue, and the background is black, the character color code is the fuselage,
Each color is represented by a 3-bit code to identify the color depending on which part of the wing or background the dot is located on. On the other hand, the hue code changes the hue of the characters, which are colored separately for the fuselage, wings, and background of the airplane, as if by applying a filter, so the same hue code is determined for one character. For example, the code ``00'' indicates that the character color code will be used as is, the code ``01'' indicates that the hue will be changed as if a pink filter was applied, and the code ``10'' indicates that the yellow color will be displayed. It represents changing the hue as if it were filtered, and the code "11" represents changing the hue as if it were being filtered to brown. Therefore, the color code converter 42 determines the color of one dot based on the character color code and provides the television interface 43 with a color signal in which the color is corrected based on the hue code. In this way, the CRT display 41 displays a color based on the character color code and hue code each time the electron beam changes by one dot in the horizontal direction.

Note that if the CRT display 41 is not a color display, that is, a black and white display, a brightness code is stored in the character storage memory 61 instead of the character color code. In this case, no hue code is required.

Next, the operation when displaying a character symmetrical about the Y axis or the X axis will be explained. In this case, the attribute information of the moving object written in advance in the memory 11 may be an X-axis symmetrical code or a Y-axis symmetrical code as a control code.
A logic "1" is stored in each axisymmetric code with one bit. For example, a case will be described in which a character symmetrical with the X axis is displayed, that is, a case in which a character pattern shown in the fourth quadrant is displayed when the character pattern shown in the first quadrant of FIG. 5B is stored in the memory 61. In this case, the bit of the X-axis symmetrical code becomes logic "1" and the bit of the Y-axis symmetrical code becomes logic "0". X like this
When the attribute information including the axisymmetric code is input to the latch circuit 15, the latch circuit 15 provides an X-axis symmetry display signal to the X-axis symmetry code generator 24. In response, the X-axis symmetrical code generator 24 subtracts the difference data between the vertical scanning address and line number inputted from the comparator 23 from the numerical value 7 to obtain ΔV data.
That is, taking the example of the moving target OB1, when the X-axis symmetry code is logical "0", the ΔV data increases from 0 to 7 as the row number corresponding to the horizontal scanning line increases. On the other hand, when the X-axis symmetry code is logical "1", the ΔV data decreases by 1 from 7 to 0 as the row number of the horizontal scanning line increases. For this reason, the moving target OB
The order in which the character patterns corresponding to 1 are read from the memory 61 is reversed compared to the case where the character patterns are not symmetrical about the X axis. As a result, a character symmetrical to the X axis is displayed as shown in the fourth quadrant of FIG. 5B.

On the other hand, when displaying a character symmetrical about the Y-axis, the bit of the Y-axis symmetrical code included in the control code is stored in the memory 11 as logic "1". In this case, the Y-axis symmetrical code is written into the row buffer memory 22a or 22b. and,
When the Y-axis symmetrical code read from the row buffer memory 22a or 22b is latched by the latch circuit 28, the Y-axis symmetrical display signal generator 55 converts the signal (for example, high level) for shifting the shift direction to the left from parallel to serial. Give it to the container 62. Therefore, the parallel-to-serial converter 62 shifts the data of one line (8 dots in the horizontal direction) of one character read from the memory 61 in the opposite direction (that is, left shift) compared to the case where the data is not symmetrical about the Y axis. and read it out. As a result, the column buffer memory 32a or 32b has 1
Data for each dot of a pattern of two characters is written in the opposite direction to that in the case where the data is not symmetrical about the Y axis. As a result, a character symmetrical about the Y axis is displayed as shown in the second quadrant of FIG. 5B.

If you want to display a character that is symmetrical to both the X and Y axes, that is, a character in the third quadrant shown in Figure 5B, use the
Each bit of the axisymmetric code is a logic "1".

In this way, if you want to display one character pattern in a pattern that is symmetrical only on the X axis, a pattern that is symmetrical only on the Y axis, or a pattern that is symmetrical on both the X and Y axes, the following information is stored in the memory 61. By changing the reading order of one character pattern, four types of characters can be generated, and the storage capacity of the memory 61 is reduced to 1/1 compared to the case where character patterns are stored for each character.
4, and if the storage capacity of the memory 61 is selected to be the same, there is an advantage that the number of characters that can be generated can be increased by four times.

Furthermore, according to this embodiment, even if the display positions of characters overlap, they can be displayed in an overlapping manner by giving priority to later writing. That is, when displaying the moving object OB5 overlapping the moving object OB4 as shown in FIG. 5C, conventionally, even if the background part of the moving object OB5 overlaps the moving object OB4, the overlapping part The character of moving target OB4 was visible missing. In contrast, in this embodiment, even if the background portion overlaps, the character of that portion appears to be displayed. The reason for this is that the character color code is written in the column buffer memory 32a or 32b as follows. That is,
Only the character color code corresponding to one dot of the character pattern read from the memory 61 is written into the corresponding area of the column buffer memory 32a or 32b in the write mode, so that the previously written content is erased. It turns out. but,
What is written is the character color code of the character itself to be actually displayed, and nothing is written about the character color code of the background portion.
In other words, since the character color code "000" is written, the data of the dots written earlier in the same part are ignored.

As described above, according to the present invention, attribute information of a moving object to be displayed in one frame can be classified based on the position corresponding to the row number of the horizontal scanning line, and it can be classified based on the column number. Since the content to be displayed is stored in the buffer memory after performing two-stage classification using This method has unique effects such as being able to greatly increase the number of moving objects that can be displayed in one frame compared to the conventional method. As a result, the video game device to which the present invention is applied can greatly increase the number of moving objects that can be displayed in one frame, making it possible to diversify game content, and also making it possible to display a large number of moving objects at a low cost. Can be displayed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the principle of the invention. FIG. 2 is a diagram schematically showing the relationship between the screen of the scanning display 41 and the column numbers and row numbers. FIG. 3 is a circuit diagram of a specific embodiment of the present invention. FIG. 4 is a diagram schematically showing the relationship between the state in which a moving object is stored in the moving object storage memory and the horizontal scanning line. Figures 5A to 5C
The figure is an illustrative view for explaining the display state of one character in this embodiment. FIG. 6 is a time chart showing the relationship between the vertical blanking signal and the operating state of the CPU 12. FIG. 7 shows the horizontal blanking signal and each buffer memory 22a, 22b,
It is a time chart showing the relationship between the operation modes of 32a and 32b. FIG. 8 is a time chart showing the relationship between the horizontal blanking signal and the operating state of each part to explain the operation of each part of the row-based classification storage/readout circuit 20. FIG. 9 is a time chart showing the relationship between the operating state of each part and the horizontal blanking signal to explain the operations of the row-based classification readout storage circuit 20 and the column-based classification readout storage circuit 30. In the figure, 10 is an attribute information generation circuit, 20 is a row-based classification storage/readout circuit, 30 is a column-based classification storage/readout circuit, 40 is a display unit, 50 is a control signal generation circuit, and 60 is a character pattern generation circuit.

Claims (1)

[Claims] 1. A display control method for displaying a plurality of moving objects on a screen in a scanning display that displays characters on a screen by repeating horizontal and vertical scanning of an electron beam. attribute information storage means having a storage capacity capable of storing attribute information of each of a plurality of moving objects to be displayed in one frame of the scanning display; a first storage means having a storage capacity correlated to the maximum number of moving objects; and a first storage means capable of storing data based on part of the attribute information of the maximum number of moving objects that can be displayed in one horizontal scanning period of the electron beam. a second storage means having a storage capacity, the display apparatus further comprises a second storage means having a storage capacity, and a second storage means having a storage capacity, and a second storage means having a storage capacity; The first step selects the attribute information of the moving target to be displayed at the position and sequentially writes it into the first storage means.
writing step of writing data based on part of the attribute information of the moving object sequentially read from the first storage means to the second storage means using data correlated to the horizontal position of the electron beam as an address; and a supply step of reading out the stored contents of the second storage means in synchronization with the horizontal position of the electron beam and supplying the read contents to the scanning display. 2. The first storage means includes a first buffer memory and a second buffer memory, the second storage means includes a third buffer memory and a fourth buffer memory, and the first write step The attribute information of the moving target is stored in the first buffer memory or the second buffer memory.
The second writing step includes a step of writing data based on part of the attribute information of the moving object read from the first buffer memory or the second buffer memory into the second buffer memory. 3 buffer memory or the fourth buffer memory, and the supplying step alternately writes the stored contents of the fourth buffer memory or the third buffer memory in synchronization with the horizontal position of the electron beam. A method for controlling a display of a scanning type display according to claim 1, further comprising a reading step. 3. The scanning display is formed by arranging a plurality of (m×n) dots, each of which has a relatively large number of dots in the horizontal and vertical directions, and a relatively small number of dots in each of the horizontal and vertical directions. A set of a plurality of (x×y) dots is determined to represent one moving object, and a column number is determined for each relatively small predetermined number of dots in the horizontal direction on the screen, and A row number is determined for each relatively small predetermined number in the vertical direction on the screen, and the attribute information of the moving object includes a column number and a row number for specifying a display position of the moving object to be displayed; character identification information for identifying the type of moving object, the first storage means includes a first buffer memory and a second buffer memory, and the second storage means includes a third buffer memory. and a fourth buffer memory, further comprising a first reading step of reading out one frame's worth of attribute information of the moving object stored in the attribute information storage means in synchronization with the horizontal scanning; The writing step writes attribute information of the moving object including the line number having a predetermined relationship with the horizontal position of the electron beam from among the information read from the attribute information storage means during the horizontal scanning period of the scanning display. , comprising the step of alternately writing into one of the first buffer memory and the second buffer memory for each horizontal scan of the electron beam, and writing into one of the first buffer memory and the second buffer memory. The second writing step further includes a second reading step of reading out the attribute information of the moving object read from the second buffer memory or the first buffer memory. Based on the fact that there is a predetermined relationship with the horizontal position of the electron beam, data based on the character identification information included in the attribute information of the moving object is rearranged in a predetermined order for each horizontal scanning line, and the third 2. The display control method for a scanning type display according to claim 1, further comprising the step of alternately writing data into either one of the second buffer memory and the fourth buffer memory. 4. A display control device for displaying a plurality of moving objects on the screen in a scanning type display that displays characters on the screen by repeating horizontal scanning and vertical scanning of an electron beam, wherein the scanning Attribute information generating means for generating attribute information for each of a plurality of moving objects to be displayed in one frame on a screen of a digital display, correlated to the maximum number of moving objects that can be displayed in one horizontal scanning period of the electron beam. a first storage means which has a storage capacity and selects and stores attribute information of a moving target to be displayed at the vertical position according to the vertical position of the electron beam, which can be displayed during one horizontal scanning period of the electron beam; It has a storage capacity capable of storing at least part of the maximum number of attribute information of the moving target, and electronically stores data based on part of the attribute information of the moving target sequentially read from the first storage means. a second storage means for storing data correlated to the horizontal position of the electron beam as an address; and a supply means for reading the stored contents of the second storage means in synchronization with the horizontal position of the electron beam and supplying the read contents to the scanning display. A display control device for a scanning display. 5. The attribute information generating means includes attribute information storage means having a storage capacity capable of storing attribute information of a plurality of moving objects to be displayed in one frame of the scanning display. Display control device for scanning display. 6. The attribute information generating means includes attribute information writing means for writing attribute information of a plurality of moving objects to be displayed in one frame into the attribute information storage means for each vertical blanking period of the scanning display. . The display control device for a scanning display according to claim 5, further comprising reading means for reading out the attribute information storage means in synchronization with the horizontal position of the electron beam. 7. The first storage means stores the selected attribute information in a first buffer memory, a second buffer memory, and a position specified by an address correlated to a vertical position of the electron beam. a first writing means for alternately writing into either one of the second buffer memories; and an unwritten one of the first buffer memory and the second buffer memory in correlation with the horizontal position of the electron beam. the second storage means includes: a third buffer memory; a fourth buffer memory; and a moving object read from the first buffer memory or the second buffer memory. A second write which rearranges data based on part of the attribute information as an address using data correlated to the horizontal position of the electron beam and writes the data alternately into either the third buffer memory or the fourth buffer memory. 5. A display control device for a scanning display according to claim 4, comprising means for embedding. 8. The scanning display is formed by arranging a plurality of (m×n) dots, each of which has a relatively large number of dots in each of the horizontal and vertical directions, and has a relatively small number of dots in each of the horizontal and vertical directions. a set of a plurality of (x×y) dots is determined to represent the one moving object, and a column number is determined for each relatively small predetermined number of dots in the horizontal direction on the screen; A row number is determined for each relatively small predetermined number of dots in the vertical direction on the screen, and the attribute information of the moving object includes the column number and the column number for specifying the display position of the moving object to be displayed. The first storage means includes at least a row number and character identification information for identifying the type of the moving object, and the first storage means includes a first buffer memory, a second buffer memory, a vertical position of the electron beam, and the above-mentioned one. a predetermined relationship detection means for detecting that a line number included in the attribute information of the moving object has a predetermined relationship; and in response to the output of the predetermined relationship detection means, the attribute information of the moving object is detected by an electron beam a first writing means for alternately writing into either the first buffer memory or the second buffer memory for each horizontal scan; a first reading means for reading out unwritten data in the buffer memory, the second storage means comprising: a third buffer memory; a fourth buffer memory; and the first buffer memory or the second buffer memory. Based on the column number included in the attribute information of each moving object read from the buffer memory of 5. A display control device for a scanning display according to claim 4, further comprising second writing means for alternately writing into either one of the third buffer memory and the fourth buffer memory. 9. The supplying means includes a second reading means for alternately reading unwritten portions of the third buffer memory and the fourth buffer memory every horizontal scan of the electron beam. 9. A display control device for a scanning display according to item 8. 10 The second storage means further includes character pattern information generation means for generating character pattern information of the moving object to be displayed on the scanning display based on the character identification information, Display control of a scanning display according to claim 8, wherein the writing means includes means for writing data based on the character pattern information into either the third buffer memory or the fourth buffer memory. Device. 11. The scanning display is capable of displaying characters in color, the attribute information of the moving object includes a hue code for identifying the type of hue of the moving object, and the first buffer memory and the The second buffer memory has a storage area for storing row numbers, character identification information, and hue codes of the attribute information for each of the moving objects for each row number, and the character pattern information generating means Generates character color data for changing the color of the moving object based on character identification information, and the third buffer memory and the fourth buffer memory generate the character color data based on the character identification information for each moving object. and a storage area for storing the hue code, and the supply means is configured to:
11. The display control device for a scanning display according to claim 10, further comprising color signal generating means for generating a color signal for color display on the scanning display.