JPS5856139A - Multiple character control system - Google Patents

Abstract

PURPOSE:To utilize a read-only memory effectively, and to perform high-speed conversion to codes for character generation, by providing a small-scale table in the read-only memory, and expanding the table in a random access memory. CONSTITUTION:The 1st conversion table 3 which contains plural input codes and codes for character generation correspondingly is stored in an ROM, and a table expanding circuit 4 expands the table on the basis of the contents of the table 3. Further, the 2nd conversion table 9 wherein the corresponding codes for character generation are expanded by the expanding circuit 4 at coordinate positions defined by the input codes is stored in an RAM. In response to the plural input codes for specifying multiple characters, codes for character generation stored at coordinate positions defined by the input codes are outputted from the table 9.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a multiple character control method, particularly for displaying a multiple character "Δ" of a character "A" and a character "-" on a character display device such as a raster scan type ORT display device. , enter the input code for the character ``person'' and the character ``-''.
The present invention relates to a multiple character control method that makes effective use of memory and increases response speed in a multiple character control method that converts and outputs an input code for a multiple character "A J Tubaturn" into a character generation code.

For example, when displaying characters on a raster scan type ORT display device, the character pattern to be displayed is generated by a character generator, but a character generation code corresponding to the character pattern to be generated is input to the character generator. It is necessary to For normal characters, there is a one-to-one correspondence between the character code and this character generation code, but for example, the character "A" and the character "
Regarding the character generation code for generating the pattern of the multiple character "-" and the multiple character "-", there is a two-to-one relationship between the character code and the character generation code. When converting multiple character input codes like this into one character generation code, conventionally read-only memo 'J (ROM)
It had multiple large-scale conversion tables on top, and these conversion tables were searched multiple times for conversion.

FIG. 1 shows an example of a conventional conversion table.

In the figure, 1 is a table for the first manual code, 2-1
2-3 represent tables for second manual codes. Table 2-1. . . . are provided corresponding to the first input code and are pointed to from table 1. table 2
-1. ... stores the character generation code to be output. Specifying multiple characters is 1. For example, pack space (
B8) is performed by the input code, and multiple characters "to"
is specified using the character string [personJ, r(B8)J, rB. When the specified multiple character is detected, it is converted into a character generation code for the multiple character "Δ" as shown below. First, the first human code for the character rAJ, ((61)ss in hexadecimal) is
-7' file 1 is searched and a pointer to table 2-1 is retrieved. Next, the second manual code of the character “-” (4
6) Table 2-1 is searched by 16, and the character generation code (B 1 ) 1@ of the multiple character "he" is extracted.

According to the conventional method described above, a large amount of relatively expensive read-only memory must be used, and multiple tables must be searched, so the response speed is slow. there were.

The present invention attempts to solve this problem, and by utilizing a random access method, it is possible to save read-only memory and quickly display multiple characters. The purpose is to Therefore, in the multiple character control method of the present invention, each input code is associated with each character in advance, and for multiple input codes specifying multiple characters, multiple characters respectively defined by the multiple input codes are assigned. In a multiple character control method that outputs a character generation code corresponding to each character pattern to generate a character pattern in an overlapping form, one or more of the input codes and the character generation code are associated with each other. A first conversion table composed of the stored IJ + de-only memory, a table expansion circuit that performs table expansion based on the contents of the first conversion table, and one or more of the above a second conversion table consisting of a random access memory in which character generation codes respectively corresponding to the coordinate positions defined by the input code are developed and stored; The present invention is characterized in that a character generation code stored in a coordinate position defined by the plurality of input codes of the second conversion table is outputted in response to an input code.

That is, the present invention has a small-scale notebook on a read-only memory, and expands the table on a random access memory.
This allows effective use of memory for illustrations and high-speed conversion to character generation code. This will be explained below with reference to the drawings.

FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of a configuration example of the first conversion table of the present invention, and FIG. 4 is a diagram of a configuration example of the second conversion table of the present invention. . In the figure, 3 is a first conversion table composed of a read-only memory, 4 is a table expansion circuit, 5 is a data conversion circuit, 6 is a multiple character detection circuit, 7 is a first manual code buffer, and 8 is a first conversion table. 2-person code buffer, 9
10 is a display control circuit, 11 is a character generator for generating character patterns, and 12 is an ORT$.
straddle.

In the first conversion table 3, input codes and corresponding character generation codes are stored in a compressed form to the minimum necessary level, as shown in Figure gg3, for example. In the example shown in Figure 3, when the input code (61) + s for the character "A" is input alone, the character generation code (41) +
a is output, and the input code for the character "A" (61L@) and the input code for the character "-" (46) so are combined and input using, for example, pack space (BS) as described above, multiplexing occurs. It will be converted into a character generation code (Bl)+e for generating the character "go" pattern and output.The first conversion table 3 is designed so that the information will not be volatile even if the power is cut off. Read only
Consists of memory.

On the other hand, the second conversion table 9 is constructed of a random access memory that is inexpensive and has fast access, but in general, random access write memory loses its stored information when the power is turned off. Information is set for this as follows. When the system is powered on and started, a start signal is supplied to the table expansion circuit 4. The table development circuit 4 reads out the first conversion table 3 in response to the start signal and creates a second conversion table 9 as shown in FIG. In other words, if only the first human power code exists in the first conversion table 3, the second human power code in the second conversion table 9 shown in FIG. Corresponding to the code, the code for generating Ushima characters is stored. Character pattern ``^'' of first conversion table 3 shown in Figure 3
'', in which there is a first manual code and a second manual code, the X-direction coordinate value defined by the first manual code (61) ts in the second conversion table 9 in FIG. The corresponding character generation code (E
1,) I. is stored. In addition, the same character is generated at the position (y, z) on the second conversion table 9 so that the same result can be obtained even if the first manual code and the second manual code are input in the reverse order. code (El)to is stored. For locations where multiple characters are not allowed, for example (00)ss is set as shown.

When a request to display characters is made from the host (HO8T) in the above state, the process is performed as follows.

In FIG. 2, an input code from the host side is input to a data conversion circuit 5, and a multiple character detection circuit 6 checks whether multiple characters are specified. That is, this check is performed by determining, for example, whether the previous input code was a pack space (BS), or whether the input code that has just arrived is a cover space (B8), etc. If it is a normal input code without designation of multiple characters, the input code is stored in the first manual code buffer 7. 1
If the previous input code is pack space (BS) and multiple characters are specified, the new input code is stored in the second manual code buffer 8. If the input code that has just arrived is a blank space, the next input code is prepared to be processed as multiple characters.

When the input code is stored in the first manual code buffer 7, the input code is converted into a signal indicating the coordinate in the X direction of the second conversion table 9. If multiple characters are not specified, the second manual code buffer 8 is cleared and is in a friendly state, and the second manual code buffer 8 is
The character generation code in the column of manual code "None" is extracted and supplied to the display control circuit 9. Multiple characters are specified and the second human code... (When the second human code is stored in the sofa 8, the input code is converted into a signal indicating the coordinate in the Y direction of the II2 conversion table 9,
Along with the coordinate value in the X direction based on the first manual code, the second
One point on the conversion table 9 is indicated by direct pressure. That is, when multiple characters are specified, from the coordinate 2 according to the first manual code and the coordinate V according to the second manual code,
The character generation code stored at the coordinate position (z, y) on the second conversion table 9 is retrieved and sent to the display control circuit 10.
supplied to

The display control circuit 10 generates a character pattern using a character e-generator 11 [therefore, for example, a dot character pattern] based on the supplied character generation code, and outputs a character pattern to the ORT display 12
The character pattern is displayed on the display screen.

In addition, although the above embodiment deals with the case where the degree of multiplication of multiple characters is "2", the same applies when there are three or more characters. For example, in the case of three characters, the second conversion table is converted into three-dimensional coordinate values. , and place the corresponding character generation code.

As explained above, according to the present invention, the read-only memory can be reduced to the minimum necessary size, and the conversion process can be performed using a relatively inexpensive and fast random access memory. Become. Moreover, since the number of times the conversion table is searched can be reduced, conversion into character generation codes can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is an example of a conventional conversion table, FIG. 2 is a configuration diagram of an embodiment of the present invention, FIG. 3 is an explanatory diagram of a configuration example of an 8g1 conversion table, and FIG. 4 is a configuration of a second conversion table. An example explanatory diagram is shown. In the figure, 3 is a first conversion table, 4 is a table expansion circuit,
5 is a data conversion circuit, 6 is a multiple character detection circuit, and 7 is a first
A human code buffer, 8 a second human code buffer, 9 a second conversion table, 10 a display control circuit, 11 a character generator, and 12 an ORT. Patent applicant Hiroshi Mori, agent patent attorney of Fujitsu Ltd.

Claims (1)

[Claims] Each input code is associated with each character in advance, and for multiple input codes specifying multiple characters, to generate a character pattern in which multiple characters each defined by the multiple input codes overlap. a first conversion table in which one or more of the input codes and the character generation codes are stored in association with each other; A table expansion circuit that performs table expansion based on the contents of the first conversion table; and a table expansion circuit that expands character generation codes corresponding to the coordinate positions defined by the plurality of input codes. a second translation table that is stored;
The second option above for multiple input codes specifying multiple characters.
A multiple character control method characterized in that a character generation code stored in a coordinate position defined by the plurality of input codes of a conversion table is output.