JPS604979A - Extra character processing system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a custom character processing method that can also handle non-standard alphanumeric characters.

[Technical background of the invention and its problems]

With the advancement of Japanese language information processing technology, kanji display devices have become more important than before.

In a kanji display device, kanji that occur frequently are generally stored in a mask ROM, while kanji that occur less frequently, so-called external characters, are registered in an external rewritable memory (RAM) and used when necessary. Read it and use it.

By the way, in this kind of kanji display device, the external characters are usually full-width size (kanji size), and the code is usually composed of 2 bytes. Therefore, if the system is operating in alphanumeric mode and it becomes necessary to handle characters of non-standard alphanumeric size (half-width) that are not registered in the standard character generator, you would want to treat them as external characters. As mentioned above, external characters cannot be handled because they are full-width characters and are 2-byte codes.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a custom character processing method that can handle even characters of non-standard alphanumeric size as custom characters without any hardware overhead.

[A chest of inventions]

In order to achieve the above object, the present invention has the advantage that the code given by the system is alphanumeric size (half-width)
A circuit that determines whether a character is a 1-byte code or a full-width kanji 2-byte code, and a code converter that uses the output of this circuit to convert a 1-byte alphanumeric character code into an internal code that is easy to handle in the character generator. The internal code obtained through this code converter is determined whether it is a standard character or a custom character, and if it is a standard character, it is For example, a standard character generator (mask ROM) K is used to generate the corresponding font data, and for non-standard characters, a non-standard character font generation section is used to generate the corresponding font data. Then, register the internal character internal code corresponding to the defined external character alphanumeric code and its font data in the external character 7 ont generator in advance, and when handling external characters of alphanumeric size, create a 1-byte external character alphanumeric code. By passing through the above discrimination circuit and code converter,
It generates half-width size custom characters.

This makes it possible to handle alphanumeric-sized external characters with a 1-byte code without any 8-doware overhead.

[Embodiments of the invention]

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 11 is the only CPU existing in the system, 12
is a system path, and the device of the present invention is connected to the CPUI via this system bus 12. The device of the present invention is functionally divided into a code converter 13 and a character generator 14.

The code converter 13 is a character generator 14 that is a character code.
The character generating section j4 is the section that generates character font data corresponding to the character code sent from the code converting section 1B.

The code conversion unit stores the code memory 13 that stores the character code (1 byte for alphanumeric characters, 2 bytes for kanji characters) sent from the system, and the code data read from this code memory 131 in byte units. Code registers 132 and 13 for temporary storage
3. A circuit 134 that determines whether this code is an alphanumeric code or a kanji code based on the contents set in the code register 132;
Alphanumeric code translator 135 (FR
OM), and by the output of the discrimination circuit 134, in the case of an alphanumeric code, the output of the alphanumeric code translator 135 is sent, and in the case of a kanji code, the code data set in the code registers 132 and 133 is sent to the character generation unit L4. It is composed of a selector driver 136 that outputs an internal code to the input signal. The code data converted by the alphanumeric code translator 135 is converted into a form similar to the address information of the mask ROM 142 in which the font of the alphanumeric character is stored.

The character generation unit 14 includes an address conversion circuit 141 that converts the internal code obtained from the character code conversion unit into address information of a mask ROM 142 in which a corresponding character font is stored, and the above-mentioned mask ROM (character generator). When the internal code is a non-standard character code, a non-standard character control unit 143 consisting of a part that searches for the corresponding non-standard character from a built-in non-standard character registration table and reads out font data and a non-standard character RAM (non-standard character registration table memory and non-standard character font memory) arrives. A circuit 144 that determines whether the internal code to be used is a standard character or a custom character, a slice address generation circuit 145 that generates slice address information when reading a character font, and an output from the determination circuit 144 that determines whether the font data obtained from the mask ROM J 42 or CRT as a 7-ont data character font obtained from the external character control unit 143.

It is composed of a selector and a driver 146 that output to a display control device (not shown) such as a printer.

Note that the address conversion circuit 141 described above has an internal code,
In other words, the kanji codes handled by the system are themselves mask ROMs.
Since the address is fixed in a form close to H.242 address, it does not have a large conversion function.

FIG. 2 is a code table used by the apparatus of the present invention, and the code data stored in the code memory 131 follows this table. Columns 0-7 and AD are similar to the JI86220 code and represent standard alphanumeric size characters. Column 8.9 (in the figure) is the first byte of the 2-byte code of the Kanji size. That is, when columns 8 and 9 are specified, the Kanji size code is made up of 2 bytes including the 1 byte following this byte. Column E, F
is a 1-byte code, and is a half-width character code.

Figure 3 is a kanji size code table (equivalent to the internal code), where the vertical axis 'OO'HEX~'FF'HEX is the first byte, and the horizontal axis '00'nnx~'FF'HEX is the second byte.
Indicates bytes. 1st bite 6"80"HgX~'9F@
Hgxs and the second byte is °OO"HEX~'
7 For F”HEX, the character ＼ B O”aEx, 'F
F' HRX is a standard character.

Hereinafter, the operation of the embodiment of the present invention will be explained in detail using FIGS. 1 to 3.

First, normal operation will be explained. One byte of code data is read out from the code memory 131 by a trigger from the CPU 11 and set in the code register 132.

This code data is discriminated by the discrimination circuit 134 as a 1-byte code or a 2-byte code, and the first byte code of the 2-byte code, that is, the code in column 8°9 shown in FIG.
If the code data is , the following 1-byte code is read from the code memory 131 and set in the code register 133. After that, the selector and driver 136
34 output selects ■ in the code table shown in FIG. That is, 2 set in code registers 132 and 133
The byte data is output to the character generation section 14 as an internal code. If the contents of code register 132 are determined to be a 1-byte code, the second byte will not be read. Meanwhile, the data is input to an alphanumeric code translator 135 and converted into a 12-byte internal code. In this case, the selector driver 136
Select ■ in the code table shown in the figure and output.

On the other hand, in the character generation section 14, the internal code inputted from the code conversion section Q is first determined by the discrimination circuit 144, and if it is a non-standard character, it triggers the non-standard character control section 143 to convert it into non-standard character font data, and the selector/driver 146 Output to the outside through.

If it is a standard character, the internal code is the address conversion circuit 141
The data is converted into character font data by the mask ROM 142, and outputted through the selector driver 146. The external display control device generates full-width font data (for example, 24 dots) depending on whether the character is full-width or half-width, based on the font data obtained from the character generation section 14 and the alphanumeric information output from the code conversion section JJ. or half a month's worth of font data (for example, 1
2 dots) from the code converter 13.

Now, we will explain how half-width size custom characters are generated. The data retrieved from the code memory 131 and set in the code register 132 is
If the data is in columns E and F of the code table shown in the figure, the determination circuit 134 and selector driver 136 determine it as a 1-byte code (alphanumeric size), and the alphanumeric code translator 135
is output to the character generation unit 14 as an internal code.

Here, the alphanumeric code translator 135 converts the data in columns B and F into custom character codes (i.e.,
Convert to the code in part 0 of the code table shown in FIG. t
-11, the contents of code register 132 are 'EO''T
(For EX, internal coat "'9 FEO" Hwx K
Convert. Naturally, the character generation unit 14 treats this code as a non-standard character and outputs the corresponding non-standard character font to an external display control device. On the other hand, the code conversion unit 13 notifies the display control device that this code is alphanumeric size (half-width), so it is displayed as half-width characters. That is, the system sends the external character code w9FEOw to the external character control unit 143.
By registering the corresponding character font in half-width size as HEx, the 1-byte code "IO" 1 (this means that half-width non-standard characters can be displayed in EX).

〔Effect of the invention〕

As described above, according to the present invention, an alphanumeric size external character can be handled with a 1-byte code without any overhead of octoware. for example,
Similar to the character 'half 1 degree', characters such as 'Φ' (cent) can also be displayed in the same way.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing a code table used in the present invention, and FIG. 3 is a diagram showing a kanji code table (internal code). 13 =- code converter, 14 character generator, 1
3 No.. Code memory, 132, 133.. Code register, 134, 144.. Discrimination circuit, 135..
・Alphanumeric code translator, 13
6,146... Selector driver, 141... Address conversion circuit, 142... Mask ROM, 143...
...External character control unit, 145...Slice address generation circuit.

Claims (1)

[Claims] In the Japan Rh information processing system, which also handles non-standard alphanumeric size characters that are not registered in the standard character generator, the above alphanumeric size characters are treated as custom characters, and custom characters that correspond to predefined custom character alphanumeric codes are used. internal code,
and a external character font generation unit in which the font data is registered; a circuit that determines whether the code data given by the system is a 1-byte code of an alphanumeric size character or a 2-byte code of a kanji size; and a 1-byte A code converter that converts the alphanumeric character code into a 2-byte internal code that is easy to handle in the character generator, and a code converter that determines whether the internal code obtained through the code converter is a standard character, and if it is a standard character, generates the above standard character. If the character is a custom character, the custom character font generation section obtains a character font of a desired alphanumeric size.