JPH0446436B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a display control method for a display device that displays many types of patterns such as kanji characters and special symbols, and in particular for characters whose photo patterns are not in the font pattern memory in the display device. This invention relates to a display control method suitable for displaying so-called external characters.

[Background of the invention]

As one of the conventional display control methods, it is known to store all the necessary font patterns in the display device's internal memory, but this method has the problem of increasing the amount of memory.

Additionally, when a display control device reads a font pattern that is not in the display device's memory into an external storage device, it loads the font pattern from the external storage device into the display device's internal memory before displaying it before writing the character code. Therefore, each time this character appears, the display is interrupted for the time it takes to load the font pattern, making the display difficult to read. Another problem is that it takes time to complete the display, which is a serious problem, especially in the case of line-received data, in that a response cannot be returned within a specified time.

[Purpose of the invention]

An object of the present invention is to enable display of custom characters without increasing the memory capacity for font patterns in the display device, and furthermore, by displaying the screen and loading the custom character pattern at different timings, a display completion response can be achieved. The object of the present invention is to provide a display control method that also enables quick returns.

[Summary of the invention]

The gist of the present invention is that when the font pattern of the character code to be displayed on the screen is not stored in the font pattern memory, it is temporarily displayed with a special mark. At another time, the position of the special mark is searched asynchronously using the external character management table corresponding to the display position in the display refresh memory, a font pattern is loaded, and the font pattern is replaced with the original character pattern. The point is that it is possible to display the information.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, 100 is a processing unit (CPU),
103 is display refresh memory (RFM) 1
01, a display device consisting of a font pattern memory (CGM) 102 for storing character font patterns and a display unit (DISPLAY) 107; 104, an external storage device; Also, 10
Reference numeral 5 denotes a private character management memory that stores a private character management table in one-to-one correspondence with the display refresh memory 101, as will be described later.

The processing device 100 includes a display refresh memory 101 and a CG memory 10 in the display device 103.
2, the CG memory 102 is connected to the refresh memory 1, and the font pattern is written to the CG memory 102.
For 01, the character code is read and written. Further, an external storage device 104 is connected to the processing device 100, and character font patterns not stored in the CG memory of the display device 103 can be read out. Furthermore, a line control device 106 may be connected to the processing device 100 to operate by being connected to an external computer or the like via a line or the like.

The processing device 100 also includes a private character management memory 1.
05 is connected, and character codes corresponding to character font patterns not stored in the CG memory 102 can be stored.

The line 116 is a line for connecting to an external computer, etc., and is connected to the line control device 106. Control connection lines 110, 111, 112, 113
are the display refresh memory 101,
These are connection control and data lines between the CG memory 102, external storage device 104, and external character management memory 105 and the processing device 100.

FIGS. 2A to 2D show display screens A and D, the contents B of the refresh memory, and the contents of the private character management memory .

The data displayed on the screen is given either by a user program running in the processing device 100 or by data input via the line 116 through the line control device 106, and a character code is sent to the display device 103. Is displayed.

Consider a case where the given character data displays, for example, "ABC Ai Mountain..." as shown in FIG. 2A. The kanji characters "AB..." are written into the refresh memory 101 as shown in FIG. 2B. This example shows the case where one character is expressed by a 2-byte code, and Figure 2 B and C are
Hexadecimal code is displayed. The character "A" 204 is written as a code (00C1) ₁₆ , the character "B" as a code (00C2) ₁₆ , and so on on the refresh memory 101. Unlike ordinary EBCDIK code characters (generally expressed as one-byte codes), Kanji codes also occupy two characters' worth of display space. Therefore, as shown in the case of the character "yama" 205,
(4xxx) The code is divided into ₁₆ , and the same thing is written in two areas at the same time.

Hereinafter, the operation of the display device of this embodiment will be described using as an example a case where the non-standard character code is given as the character "river" next to the character "yama".

Since the font pattern corresponding to the character code for "mountain" was stored in the CG memory 102 of the display device 103, two characters, for example (40D1) ₁₆ , are written in succession in the refresh memory 101 as shown in FIG. 2B. was displayed. However, since the character "river" that follows this is not in the CG memory 102, it is not written to the refresh memory 101, and instead, a predetermined special mark (for example, the display screen 200 in FIG. 2A) is written to the refresh memory 101. Enter the code corresponding to the solid mark 201) inside. The above code, for example, as shown at 206 in FIG. 2B, is different from a normal character code and uses (4FFF) ₁₆ in which the last three digits are all (F) ₁₆ . Special mark code 2
06, the special mark 201 is displayed on the display screen.

The above-mentioned special mark may be anything that the operator understands that it is not an original character pattern, and does not need to be a solid mark 201 as shown here. In addition, the code corresponding to the special mark may be one that can be distinguished from other character codes,
It doesn't necessarily have to be (4FFF) ₁₆ .

In the display device of this embodiment, the CG memory 1
Instead of reading the character pattern for "river" that is not in 02 from the external storage device 104 and displaying it, the system displays a predetermined special mark 201 as described above and then moves on to displaying the next character. be. That is, in this case, the code (0083) ₁₆ for the next character "U" is written into the refresh memory 101 and displayed, and this is continued until all display contents are displayed. Therefore, there is no need for processing waiting time for reading character patterns of external characters from the external storage device 104, and the time required to complete display processing of display contents can be shortened to a minimum.

In the above explanation, the character code of the character that is a custom character is displayed using the special mark 201, but at the same time that the code (4FFF) ₁₆ is written to the refresh memory 101, it is written to the custom character management memory 105. Enter the character code 209 that will be a non-standard character. In the example shown in FIG. 2C, the code to be written to the refresh memory 105 is written to the external character management memory 1
05, and all areas without external characters are cleared with (0000) ₁₆ as shown in 208.

As a result, in an asynchronous processing program that is started at a timing completely different from display processing, the table (MEM-T) on the external character management memory 105 is searched for a code other than (0000) ₁₆ , One character is read from the external storage device 104 according to the character code, the font of the character pattern is written to the CG memory 102, the character code is written to the refresh memory 101, and the character code is deleted from the table on the external character management memory 105. . The asynchronous processing described above may be started by, for example, starting a timer every 10 msec, or by writing a pattern for one character in one start, or by writing two or more characters at once. It's fine.

An example of the processing flow of the above processing program is shown in FIGS. 3 and 4.

FIG. 3 is a flowchart showing the process of reading screen display data character by character and writing it into the refresh memory 101 under the control of the processing device 100. In the figure, ○- means interrupts are disabled, and 〓
indicate the release of interrupt prohibition.

In the above writing, when a character code to be a custom character is found, the special mark code is written to the refresh memory 101, and the special mark code is written to the refresh memory 101,
Write the character code in 5 as well. When writing a character code into the refresh memory 101, it is checked whether the character already written below it is a special mark. In addition, interrupt disabling/cancelling processing is included so as not to conflict with the processing flow shown in FIG. 4 below.

FIG. 4 shows a process that is started at a timing different from the character code writing by display and asynchronously with the display process, and as described above, it may be started by a timer every 10 msec, for example. When activated, the external character management memory 105 is searched under the control of the processing device 100 to check whether a character code is written. If a character code is written, the font pattern of that character code is retrieved from the external storage device 104. The read font pattern is checked by reading the external character management table 105 again while interrupts are disabled, and the font pattern is written to the CG memory 102, the character code is written to the refresh memory 101, and the external character management table is read. The corresponding character code in the external character management table on 105 is deleted. After the above process is completed,
Cancel interrupt prohibition.

Among the above processes, interrupt prohibition/cancellation is to prevent judgment errors caused by conflicts caused by interrupt processing that occurs during memory read/write, and it is not necessarily necessary to set the arrangement as described above. Conflict management may be done in another way. For example, if the structure is such that the processing in Figure 3 cannot occur in the interrupt-prohibited section in Figure 4, interrupt prohibition/cancellation in Figure 4 is not necessary. .

In the above embodiment, private characters are displayed as solid special marks 201 without waiting for access. However, since the number of private characters is usually very small, in most cases, the correct pattern can be determined by waiting for access. Even if it is not filled in, the operator can get a feel for the general content. As a result, if you request more data from the previous one, it will switch to the next screen and display it even if the solid special mark remains.
Can be processed quickly. In particular, when data is received from another computer using a line, the line usage time and the other party's computer usage time can be saved.

In addition, if you perform the external character display processing that is started at a different timing as shown in Figure 4, even if a solid special mark becomes a key point, if you wait, the solid special mark will be displayed one character at a time as it should be. Since the pattern is replaced with a pattern of 1, reading accuracy is not lost.

Therefore, according to this embodiment, even if there are external characters in the screen display reception data sent through the line, they are displayed as a solid special mark and the process continues, so the entire screen can be understood quickly, and the above-mentioned solid If you want to see the painted special marks in a pattern, you can simply break and wait and they will be replaced automatically. Of course, there is no problem if the solid special mark is rewritten with other data before it is originally converted into a pattern.

Furthermore, if the original pattern does not exist in the external storage device 104, the code (4FF1) 16 shown at 207 in FIG. 2B is written as the square mark 202 shown in FIG. 2A, for example, to notify the external storage device ₁₀₄ . be able to. The screen D in FIG. 2 without the solid special mark is obtained over time by repeating the asynchronous processing shown in FIG. 4. It goes without saying that the square mark 202 or its code (4FF1) used when the original pattern does not exist in the external storage device 104 may be replaced with another mark or code.

〔Effect of the invention〕

As described above, according to the present invention, when the font pattern of the character code to be displayed on the screen is not stored in the font memory, a predetermined special mark is displayed instead.
This has the effect of realizing a display control method that can quickly return a display completion response without increasing the capacity of the font pattern memory. Also, asynchronously with the above processing, it is possible to search the external character management table corresponding to the position of the above special mark, load the font pattern, and replace it with the original character pattern. This has the effect of making it possible to display external characters with a time delay.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention;
Figure 2 A and D are diagrams showing the display screen, Figure 2 B
Figure 2C shows the contents of the refresh memory.
is a diagram showing a private character management table, and FIGS. 3 and 4 are processing flowcharts. 100...CPU, 101...Display refresh memory, 102...Font pattern memory, 103...Display device, 104...External storage device, 105...External character management memory, 106...Line control device, 107... ...Display unit.

Claims (1)

[Claims] 1. A first memory for display that stores display character codes corresponding to display positions on the display screen, a second memory that stores character font patterns, and character fonts stored in the second memory. Using a third memory that stores part of the pattern,
In the control method for a display device controlled by a CPU, a management table corresponding to a display position in the first memory is prepared, and the CPU selects a character code whose character font pattern is not stored in the third memory. When writing to the first memory, a code for displaying a predetermined special mark is written to the first memory, and the character code is also written to the management table, at a timing asynchronous to the writing. reading the character code, reading a font pattern corresponding to the character code from the second memory and writing it to the third memory, and further displaying the special mark on the first memory; A display control method, comprising: rewriting the code of the character code to the character code, and deleting the character code on the management table.