KR920001310B1 - Character displaying apparatus - Google Patents

Abstract

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Description

Character display device

1 is a block diagram showing the configuration of an embodiment of the present invention.

2 is a block diagram showing an overall configuration of a display system to which the embodiment of FIG. 1 is applied.

3 is an explanatory diagram showing attribute data in the embodiment.

4 is a code map of a character code according to the embodiment.

5 is an explanatory diagram showing the relationship between the character display and the character code in the V RAM 3 in the same embodiment.

6 and 7 are diagrams showing the relationship between data and display characters in the V RAM, respectively.

The present invention relates to a character display device, and more particularly, to a character display device suitable for use when displaying Chinese characters.

In recent years, the popularity of personal computers has increased significantly, and in particular, the specifications of personal computers used in Europe and America have become global standards. Therefore, many excellent softwares that meet these specifications have been developed, and since the same standards are mass-produced, the price of the personal computer itself is also inexpensive.

By the way, it is sufficient that a personal computer of the Western standard type is displayed with alphabetic characters and numbers (hereinafter referred to as alphanumeric characters) as display characters. On the other hand, in this type of personal computer, the Chinese character display function is required when running Japanese software. In this case, the graphic mode enables the display of any one character such as Chinese characters. However, when the text function (character display function) is executed in this way, the execution speed becomes slow. In addition, problems occur when the test function (character display function) is executed. In addition, when the test function (character display function) is executed, there is a drawback that the execution speed is slow and the software is incompatible and the porting is extremely troublesome.

In addition, in the above-described computer, a code of one byte representing a character (an alphanumeric character) and one byte of data representing an attribute are stored in one set so that they can be stored, decoded, and read.

On the other hand, when displaying non-alphanumeric characters, for example, Chinese characters, etc., the character code is insufficient for one byte. Therefore, the computer system for storing character codes and attribute data in memory displays only alphanumeric characters. Therefore, Chinese characters, etc., lack a single byte of character code, so they differ from those of Western standard specifications. The problem is that character codes or attribute data are difficult to remember and compatibility is not expected. In addition, in order to store characters such as Chinese characters, the attribute function needs to be further expanded.

A first object of the present invention is to make it possible to display characters such as Chinese characters in text mode even when using a personal computer of Western standard specification where only alphanumeric characters are displayed, thereby speeding up execution speed and compatibility of software. The present invention provides a character display device that can be expected to be easy to transplant.

It is still another object of the present invention to provide a character display apparatus capable of increasing attribute functions while having compatibility capable of displaying characters such as Chinese characters in software of Western standard specification computers in which only alphanumeric characters are displayed.

In the first state of the present invention, (a) memory means for storing a character code specifying a character to be displayed and attribute data indicating an attribute of the character; and (b) A first character generator that stores in advance the shape data corresponding to the alphanumeric character, (c) a second character generator which previously stores the shape data corresponding to the Chinese character, and (d) a scan of the display surface ( A judging section for judging whether the character code read out from the above-mentioned storage section alone is data indicating a character or data indicating two or more characters, and (e) in case of displaying an alphanumeric character. On the basis of the determination result of the judgment unit, the character data corresponding to the character code read out from the storage unit is read out from the first character generator and is displayed as attribute data attached to the character code.In the case of displaying the received alphanumeric character and displaying the Chinese character, the character data corresponding to the character code read out from the storage part is read out from the second character generator on the basis of the determination result of the above-described judgment part and is written into the character code. There is provided a character display device having a control unit for displaying a corresponding Chinese character as an attribute displayed by the accompanying attribute data.

In the second state of the present invention, (a) a memory for storing at least a character code indicating one or two or more characters, and (b) the memory described above in accordance with a scan (scanning) of the display surface ( memory), and (c) determining whether the character code extracted by the character code extracting unit is data indicating a character alone or data indicating two or more characters. A number necessary for designating characters by the determination unit, (d) a character generator that stores the character data of the character in advance, and (e) the character code inserted by the character code extracting unit on the basis of the determination result of the determination unit described above. The address generator of the character generator in which the character data of the character indicated by the character code is stored with reference to (f) is read from the character generator in correspondence with the created address. There is provided a character display apparatus that displays characters on the basis of single character data.

In the third state of the present invention, (a) a memory for storing a character code indicating a character with one or two and attribute data paired with the character code, and (b) a display. A judgment section for determining whether the character code read out from the memory according to the scanning of the surface is data indicating characters alone or data indicating characters of two or more characters, and (c) a character generator for storing character data of characters in advance; And (d) shape data reading means for reading out the shape data of the corresponding character from the above-mentioned character generator with reference to the number of character codes necessary for designation of the character on the basis of the determination result of the above-described judging section; e) On the basis of the judgment result of the above-described judging section, attribute data paired with the second or later character code of the character code specifying two or more characters are recognized as the extended attribute data, and the extended attribute data is recognized. To provide a character display apparatus having the attribute controller for controlling a character displayed according to the attribute represented by the attribute property data is the first data and the character code and the pair of.

An embodiment of the present invention will be described with reference to the drawings as follows.

1 is a block diagram showing the configuration of one embodiment of the present invention, and FIG. 2 is a block diagram showing the overall configuration of a display system to which the embodiment is applied.

In FIG. 2, 1 is, for example, a central processing unit (CPU) installed in a Western-style personal computer, which operates by a predetermined program. The CPU 1 exchanges various data with the CRT controller 2 and controls the CRT controller 2. The CRT controller 2 controls the display of the CRT display device 4, and reads the data in the V RAM (video RAM) 3 in accordance with a scan (scanning) of the display surface, and based on the read data Display control. In this case, the V RAM 3 is composed of the first plane 3a and the second plane 3b as shown in FIG. 1, and in the text mode, the character code is stored in the first plane 3a. Attribute data for displaying attributes of display characters is stored in the second plane 3b.

Here, attribute data is 8-bit data shown in FIGS. 3A and 3B, and there are two types of basic attribute data and extended attribute data. Each bit in each attribute has a function shown, for example. That is, in the basic attribute data shown in FIG. 3a, the 0 through 2nd bits have a color designation function for characters, and the 0, 1st, and 2nd bits respectively indicate blue, green, and red chromaticity on / off. do. In addition, the fourth bit and the fifth bit indicate the display of the underline and the left vertical line, respectively, the sixth bit designates the inverted character (the character whose color and background colors are inverted), and the seventh bit designates the flashing character. do. In the extended attribute data shown in FIG. 3B, the seventh bit designates a bold character, the sixth bit designates a horizontal and vertical angle, and the fifth bit designates a vertical angle. The fourth bit is a bit for indicating whether to display the upper side or the lower side of the shape at the vertical angle, and indicates the lower side when the upper side is "1" when it is "0". When the longitudinal division is not performed, that is, when the fifth bit is "0", the fourth bit is invalid. The third bit is a bit indicating whether to display the right side of the shape or the left side in the horizontal angle, and the right side when "0" and the left side when "1". This third bit is invalid when the horizontal angle is not performed, that is, when the sixth bit is "0". The second to zeroth bits are reserved bits.

The function of each bit of the attribute data described above is an example, and appropriate definitions can be given according to various modes. In addition, the character code adopts the so-called shift J.I.S.character code in this embodiment. Shift J.I.S. is a J.I.S. The Chinese character division in the C6226 standard is moved to a division not used in the standard so that it does not overlap with the assignment position of the ordinary receiver. The code map (memory system) is shown in FIG. In this figure, regions designated by S.JIS-1 and S.JIS-2 are kanji characters, and the kanji in this region is designated by a 2-byte character code. In addition, half-width characters such as alphanumeric characters (ANK), half-width characters, and single-letter KANA are designated by one-byte codes, that is, (0 0)-(7F) and (A0)-(DF). do.

Next, the relationship between data and display characters in the V RAM 3 is shown in FIG. As shown in this figure, Chinese characters with two-byte character codes are displayed full-width, and alphanumeric characters with one-byte character code are half-width displayed. Therefore, the area occupied by the character on the display surface corresponds to the size of the region occupied by the character code of the character in the V RAM 3. In the case of alphanumeric characters displayed in half-width characters, one-byte attribute data is paired with respect to one-byte character codes. In the case of Kanji characters displayed in full-width characters, attribute data is paired for each of the two-byte character codes. have. The attribute data paired to the second Hanja character code is extended attribute data (see also 3b).

In the area map of the V RAM 3 shown in FIG. 5, character codes and attribute data have been alternately arranged, but in reality, they are stored in pairs on the first plane 3a and the second plane 3b, respectively. The addresses are set the same.

As shown in FIG. 1, each address bus and data bus of the first plane 3a and the second plane 3b are connected to the common bus 15 of 8 bits. The common bus 15 is used for time division, and the character code, attribute data and address data are output to the common bus 15 at the timing allocated by the CRT controller 2, respectively. In this case, the address data is composed of row address data and open address data, which are also output in time division.

Each data in the V RAM 3 is as described above, and when the CRT controller 2 reads a character code from the V RAM 3, the character generator for displaying the character data corresponding to the character code in FIG. Read from 5). The read data is converted into serial data and supplied to the CRT display 4. In this case, display color control, flashing control, or horizontal / vertical angle indicators are performed based on the attribute data accompanying the character code. (Details will be described later).

Next, 10 is a kanji display device, which is composed of a control unit 10a and a character generator 10b. Next, the structure of the Chinese character display apparatus 10 is demonstrated.

In the code extracting unit 20 shown in FIG. 1, an input terminal (8 bits) is connected to the common bus 15, and the data is extracted at the timing when the CRT controller 2 extracts character codes and attribute data. do. In this case, the code extractor 20 identifies the attribute data and the character code by an enable signal (not shown) which is an output of the first plane 3a and the second plane 3b output by the CRT controller 2. . In the data mode of both the attribute data and the character code, two bytes are stored in a predetermined flip-top (D flip-top). 21 is an attribute data latch unit having a storage capacity of 2 bytes, and the attribute data in the code extracting unit 20 is supplied sequentially from the data first extracted. 22 denotes a character code latch portion composed of a first memory portion 22a and a second memory portion 22b each having a storage capacity of one byte. The second memory unit 22b is sequentially supplied from the character code in the code extracting unit 20 first withdrawn, and the character code supplied to the second memory unit 22b is sequentially supplied to the first memory unit 22a. To be supplied to 23 is a full / half detection section that detects whether the character code in the storage section is a full-width character code or a half-width character mode based on the upper three bits of data of the first storage portion 22a. The full-width character is designated as a two-byte character code as described above, and as the first byte becomes 8, 9, and E, as shown in FIG. 4, the full-width character is represented by the upper three bits of the first memory portion 22a. The code can be identified. The full / half detection section 23 is constituted by a combination of logic gates, and outputs the full-width detection signal ZEN when the character code corresponds to any of 8, 9, and E.

24 is used to generate the address of the character generator 10b based on the character code. The address generator. The character generator 10b in this embodiment is composed of a plurality of ROMs and a nonvolatile RAM for foreign capital creation. The address generator 24 generates a tip selection signal and an address signal corresponding to the code map (see FIG. 4) based on the character code. If C.G. When the full-width detection signal ZEN is supplied from the full / half detection section 23, the address generating section 24 addresses the address based on the two-byte character codes in the first storage section 22a and the second storage section 22b. Is generated and an address is generated based on the character code in the first storage section 22a when the full-width detection signal ZEN is not supplied. The character generator 10b outputs 8 dots of data in the horizontal direction of one character when the half-width character data is read out, and 16 dots in the horizontal direction of the character when the full-width character data is read out. The 8-dot data is divided into 2 parts and outputted.

The shape data output operation of the character generator 10b is different in terms of the control signal supplied from the attribute processing section 30, and corresponds to the contents of the attribute data, which will be described later.

In Fig. 26, the 8-bit shaped data supplied from the character generator 10b is converted into serial data based on the dot clock DCK or the half clock of the dot clock DCK, and this is output as dot data and is a parallel serial converter. In this case, the serial data conversion speed is switched by the control signal supplied from the attribute processing section 20. The parallel-serial converter 26 is configured to output sequentially from the data supplied to the input terminal H.

27 is an exclusive or gate that performs an exclusive OR between the output signal of the parallel-serial converter 26 and the output signal of the console enable signal generator 43, and the console enable signal generator 43 is a console enable signal. When CEN ("1" signal) is not generated, the dot data output from the parallel-to-serial converter 26 is in a pass state.

Reference numeral 28 denotes a color code generation unit, and reads a predetermined color code from the color palette 31 for each dot data supplied through the exclusive or gate 27 and outputs it to the CRT display device 4. The predetermined color code is a color code designated by the attribute processing unit 30. That is, the attribute processing unit 30 supplies a control signal to the color code generation unit so as to select a color code corresponding to the function of each bit of the basic attribute data supplied from the attribute data latch unit 21 (see also FIG. 3A). . For example, if the basic attribute data indicates "red" as the foreground color, the dot corresponding to the character portion of the character is instructed to read the red color code. In addition, the attribute processing section 30 instructs the color code generation section 28 a process corresponding to another bit of the basic attribute data. That is, the color code generation unit 28 instructs the processing according to the presence or absence of blinking and inversion underline. When the flag SSA is set, the attribute processing unit 30 recognizes the attribute data of the second byte in the attribute data latch unit 21 as extended attribute data and performs processing corresponding to each bit of the extended attribute data. Is not set, the second byte of attribute data is ignored. The processing by this extended attribute data will be described later.

40 is an address extracting unit which extracts address data sent on the common bus 15. As shown in FIG. On the common bus 15, the address retrieving unit 40 in which the row address and the open address are output in time division is identified by the strobe signal (not shown) output by the CRT controller 2 and stored as a set of data.

The row address data and the open address data stored in the address extraction section 40 are supplied to the comparison section 41, where it is determined whether or not the data in the register 42 match.

When the comparison section 41 detects a match, the match detection signal is outputted to the console enable signal generation section 43. In this case, an address for displaying the console by the CPU 1 is written in advance in the register 42. When the coincidence detection signal is supplied, the vehicle enable signal generation unit 43 supplies the vehicle enable signal CEN (“1” signal) to the other input terminal of the exclusive or gate 27. In this case, when the full-width detection signal ZEN is supplied from the full / half-detection section 23, the period enable signal CEN corresponding to the display period of the full-width characters is output.

The exclusive ore gate 27 functions as an inverter for the parallel-to-serial converter 26 while the console enable signal CEN is being supplied. Therefore, the carousel is displayed as a character in which the character color and the background color are inverted.

Referring to the operation of the embodiment of the present invention configured as described above are as follows.

First, if the program used by the Chinese character Chinese characters is displayed on the CPU 1 and the Chinese character is not displayed, the Chinese character display device 10 does not operate. In the CRT display device 4, the display is a CRT controller. Controlled by (2). On the other hand, when the program used in the CPU 1 requires Japanese character display as Japanese, the CRT controller 2 accesses the V RAM 3 under the control of the CPU 1, but the CRT display is performed. The device 4 is not controlled. In place of the CRT controller 2, the Chinese character display device 10 retrieves the access information of the CRT controller 2, that is, character code, attribute data and address data, respectively, and based on these data, the CRT display device. (4) to control. Next, the operation in this case will be described.

First, the CRT controller 2 accesses the V RAM 3 in accordance with a scan (irradiation) of the display surface. The code extractor 20 inputs the character code and attribute data accessed by the CRT controller 2. The character code inputted to the code extracting section 20 is supplied to the character code latch section 21, and the full / half detecting section 23 determines whether it is a full-width character or a half-width character. In the case of a full-width character, the full-width detection signal ZEN is output and C.G. The address generation section 24 generates an address of the character generator 10b based on the two-byte character codes in the first storage section 22a and the second storage section 22b. In the case of half-width characters, the full-width detection signal ZEN is not output. The address generator 24 generates the address of the character generator 100b by the character code in the first memory 22a.

Next, the character generator 10b outputs twice the data of 16 dots in the lateral direction of the character when the character of the full-width character is accessed twice by eight dots. Outputs data for dots. The parallel serial converter 26 sequentially converts the data output from the character generator 10b into serial data and supplies the serial code to the color code generation unit 28 via the exclusive orifice 27.

The color code generation unit 28 generates a color code for each of the supplied dot data based on the control signal of the attribute processing unit 30 and outputs the color code to the CRT display device 4. Therefore, the character designated by the character code is displayed on the display surface of the CRT display device 4 in accordance with the color indicated by the attribute data and other attributes (flashing, inversion, etc.).

Here the flag S.S.A. When is in the set state and the Chinese character code is read out, the following processing is performed in addition to the above processing.

First, the attribute processing unit 30 recognizes the attribute data of the second byte as extended attribute data and performs processing corresponding to the function of each bit shown in FIG. 3B.

(1) When the seventh bit of the extended attribute data (the bold bit designation bit) is "1", in this case, the parallel-serial converter 26 generates the dot clock DCK based on the control signal from the attribute processing section 30. A one-clock delayed signal is created, the logical sum of the serial data created by this delay clock and the serial data created by the original dot clock DCK is taken, and the serial data obtained by this logical sum is output from the output terminal Q. In this way, the serial data obtained by the logical sum becomes data in which the shape of the child is overlapped twice in the horizontal direction (scan direction), and is displayed in bold by one dot in the horizontal direction. (2) When the sixth bit (horizontal angle designation bit) of the extended attribute data is "1", in this case, the processing is performed to display twice the horizontal expansion of the corresponding Chinese character. Thus, the display part of the shape becomes as follows.

First, when the third bit is "1", 8-bit data on the left side of the corresponding character is read out from the character generator 10b, and 8-bit data supplied from the parallel serial converter 26 is dot. Parallel conversion is performed by a clock of 1/2 of the clock DCK. In this manner, data serially converted in parallel by one half of the clock of the dot clock D.C.K. is supplied to the color code generation unit 28 with the ore gate 27 interposed therebetween. On the other hand, in the CRT display device 4, the display is performed on the basis of the normal dot clock D.C.K., and as a result, the portion on the left side of the shape is enlarged twice in the horizontal direction and displayed in full size. (See FIG. 6) When the third bit of the extended attribute data is "0", 8-bit data on the right side of the corresponding character is read out from the character generator 10b, and in the parallel-serial converter 26, Parallel-to-serial conversion is performed by the clock of 1/2 of the supplied 8-bit data dot dot DCK. In this way, data serially converted in parallel by one-half the clock of dot clock D.C.K is supplied to the color code generation unit 28 via the or gate 27.

Therefore, as in the above case, the right part of the shape is extended twice in the horizontal direction and is represented by the size of the full width. (See Fig. 6) Thus, if the above left display and the right display are successively performed on the same Chinese character code, the corresponding character of the Chinese character is doubled in the horizontal direction and displayed at the size of two full-width characters. Is completed. Here, Fig. 6 shows the relationship between data examples and display characters in the V RAM 3 at the time of performing the diagonal display. The character codes C ₁ and C ₁ shown in FIG. 6 are two character codes specifying the Chinese character of ₁ , and the attribute data accompanying the character code C ₁ is the basic attribute data B ATR, and is attached to the character code C ₁ . The attribute data is extended attribute data E.ATR. In this case, the 6th and 3rd bits of the first fixed attribute data E.ATR are “1”, and the 2nd extended attribute data E.ATR has the 6th bit “1” and the 3 bits “0”. It is.

As can be seen from the figure, on the display surface, the area occupied by the horizontal double angle character corresponds to the amount of area occupied on the memory by the data for the character.

(3) When the fifth bit (longitudinal designation bit) of the extended attribute data is "1", in this case, it is a process of displaying twice extended in the vertical direction with respect to the corresponding Chinese character. Therefore, the display portion of the child shape is different as follows.

First, when the fourth bit is "1", the shape data of the upper half of the corresponding character is read out from the character generator 10b. However, the same address of the character generator 10b is accessed twice for two scans on the display surface. Therefore, the same character data is output from the character generator 10b with respect to two adjacent lines, whereby the upper half of the child shape is doubled in the vertical direction. (See Figure 7.)

If the fourth bit of the extended attribute data is "0", the lower half of the corresponding shape is read from the character generator 10b, and other operations are as described above.

Then, the above half and half halves are sequentially displayed at the same horizontal position in the adjacent rows K and K + 1, so that the shape of the child is doubled in the vertical direction, and the vertical angle display is completed. Here, Fig. 7 shows the relationship between the example data and the display characters in the V.RAM 3 at the time of vertical angle display. In this case, data indicating display of the upper half and data indicating display of the lower half are stored in regions corresponding to the same horizontal position of adjacent rows K and K + 1, respectively. In the first extended attribute data and the E.ATR, the sixth and fourth bits are the mode "1", and the second extended attribute data E.ATR is the sixth bit is "1" and the fourth bit is "0". Is made.

Also in this vertical angle display, the area occupied by the double character on the display surface and the amount of area occupied by the data for the character on the memory correspond.

(4) When both the sixth and fifth bits are "1", the above operations (2) and (3) are simultaneously performed. That is, the horizontal and vertical angles are performed at the same time, resulting in a four-fold angle display.

Also in this quadrangular display, as can be seen from the above, the area occupied by the character on the display surface corresponds to the amount of area occupied by the data for the character in the memory.

As a result, in this embodiment, the size of the character on the display surface and the data amount of the character correspond to each other, resulting in a system similar to that of the memory map used for the Western standard.

The above is the various processing based on the extended attribute data.

Next, a cursor display process will be described. First, the address extracting unit 40 extracts address data output from the CRT controller 2. The retrieved data is compared with the data in the register 42 in the comparator 41, and when a match is detected, the console enable signal generation unit 43 generates the console enable signal CEN. As a result, the exclusive or gate 27 functions as an inverter for the position where the cursor is to be displayed and the dot data of the characters, whereby the cursor is displayed as the reverse display character.

In addition, in the above embodiment, there is an advantage that the Chinese character display can be performed only by adding the Chinese character display device 10 to the personal computer of the Western standard. Moreover, since the V.RAM 3 is still used and the access of the CRT controller 2 is used as it is, no change in hardware aspects is required.

In addition, although the control part 10a is added to the CRT controller 2 in the Example, it can also be set as the circuit which has these functions integrated together integrally from the beginning.

In addition, although the above-mentioned embodiment was an example of the display of Chinese characters / a and b in Japanese, the present invention can be applied to languages other than Japanese. That is, languages that need to use two or more character codes to indicate characters. For example, it can be applied to the display of Chinese or Korean, and the attribute function can be expanded.

In addition, in the above embodiment, if the flag S.S.A. is cleared, the recognition of the extended attribute data is not performed. Therefore, when executing software with only alphanumeric code, if the flag S.S.A. is cleared, the extended attribute data will not be mistaken for basic attribute data. As described above, when only the alphanumeric code is used or when the Chinese character code and the extended attribute data are mixed, the contents of the flag S.S.A. can be changed and written so that there is an advantage in that the compatibility is extremely high.

As described above, the present invention can display characters such as Chinese characters in text mode even when using a personal computer of Western standard, so that the speed of execution, the compatibility of the software, and the ease of porting can be expected. have.

In addition, according to the present invention, the character to be displayed is designated by two or more character codes, and the attribute function of the personal computer can be expanded, and various character display can be performed.

Claims (6)

A character display apparatus for displaying a variety of characters, comprising: storage means for storing a character code specifying a character to be displayed and attribute data indicating an attribute of a character corresponding to the character code, and scanning (scanning) of an electric screen A character code extracting unit (code fatch) for extracting the character code from the electric storage means and the character code extracted by the character code extracting unit are data for specifying a single character, or two or more characters are designated. A judgment unit that determines whether or not the data is to be stored, a character generator in which character data corresponding to an alphanumeric character and a Chinese character are stored, and a character code inserted by the character code extracting unit on the basis of the result of the previous judgment. From an address generator for generating read addresses of the armature data, and from the letter generator according to the read addresses. A character display apparatus, characterized in that provided for converting a shape that control data to the serial dot data in the screen display information, the dot data converting units. 2. The character code of claim 1, wherein the electric character code signal output unit reads the character code in synchronism with an access operation of a display controller that reads the character code from the electric storage means in response to a scan of the display surface. Character display device characterized in that for outputting. 2. The character display apparatus according to claim 1, wherein the electric character code is a character code of one byte specifying a half-width display character or a two-byte character code specifying a full-width display character. The character display apparatus according to claim 1, wherein an alphanumeric character is set as an electric half-width display character and a Chinese character is set as an electric full-width display character. In a character display apparatus for displaying various characters on a screen, the character code for designating one or more characters, the appended data indicating the attribute of the character corresponding to the same character code, and the like are stored in the display means. A judging section for judging whether or not the electric character code read out from the electric storage means in accordance with the scanning is data for specifying a character alone or data for specifying a character with two or more characters; Means for reading the same type data of the corresponding character from the character generator with reference to the required number of character codes, and if it is determined with the character code specifying the character of 2 or more, and the second or less character code. This attribute is recognized as the extended attribute data and is paired with this extended attribute data and the first character code. Thus the properties shown by the other, the character display apparatus comprising the attribute controller for controlling the text displayed. 6. A character display apparatus according to claim 5, further comprising operation switching means for validating or invalidating the recognition of the electrical property control unit and the expansion control unit data.

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