JPH0228869B2 - GURAFUITSUKUDEISUPUREISOCHINONYURYOKUFUIIRUDOSEIGYOHOSHIKI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input field control system for a graphic display device used as an input/output device for a computer.

Graphic display devices, which are generally used as input/output devices for computers, have the function of recognizing input/output information, that is, displaying the display screen according to the display data sent from the computer and presenting it to the operator as an image. It is required to have a function for allowing an operator to input information from an input device such as a keyboard connected to a graphic display device, displaying the information on the display screen, and then transmitting this input information to a computer.
In order to realize this information input function, there is an area on the screen called an input field for displaying information input from an input device, and an input field memory (hereinafter referred to as code memory) for storing input information corresponding to this input field. ) has been established.

This is true for graphic displays.
If the character data input by the operator is displayed directly on the screen, it will be expanded into dot data and the characters cannot be read from the screen. In other words, for example, as described below, the operator can see the characters while looking at the screen because characters are formed by blinking which of the 8 x 6 dots within a single character display area on the screen, but this is not enough. Since computers cannot read characters, a code memory is used only for input fields to store and hold character codes so that they can be read from a computer. When a request to transfer input information to a computer occurs, the input information is read from the code memory and transferred to the computer. In this type of graphic display device, the input from the input device is usually in the form of character information, and the input field allows an area for any number of characters to be set at any position on the screen by specifying it from the computer. Therefore, code memories for storing input character information as character codes have generally been provided in correspondence with character addresses obtained by dividing the screen into character display sections.

FIG. 1 shows an example of such a conventional display screen, and FIG. 2 is a block diagram of a code memory corresponding to this display screen.

In Figure 1, 1 is the X-direction graphic address (X _G ), 2 is the Y-direction graphic address (Y _G ), and the screen display position can be specified by X _G and Y _G , 0 to 95 and 0 to 63. It has 96 x 64 display dots. Also, the screen is 6 x 8 with these graphic addresses X _G and Y _G in the X direction and Y direction, respectively.
16× divided so that each dot is included in one section
It has 8 large character display sections with character addresses X _C and Y _C indicated by reference numbers 3 and 4, and in Figure 2 corresponds to the combination of character addresses X _C 0 to 15 and Y _C 0 to 7. 16 x 8 character codes (in Figure 2, the "null" code outside the input field, "0, 1,
This figure shows part of a code memory cell array configured to be able to store a character code corresponding to the number ``2'', a blank code with no input data in an input field, etc. Also, returning to Figure 1, 5 is a graph display, and 6 is a character display from a computer.
area, where characters can be displayed at any graphic address, regardless of the character address. Reference numeral 7 denotes a character display area within the input field, in which characters input from the input device into the input field set by the computer are displayed. When an input field is set in the code memory, a character code is written into a memory cell corresponding to the character address, and a null code is written as is in memory cells other than the input field. Therefore, when a character is input from the input device at the position indicated by the cursor 8, the character code is written into the corresponding memory cell of the code memory and at the same time, the character is displayed at the corresponding character address position. Cursor 8 is a pointer that indicates the input position to the input field, and it is not allowed to enter the area outside the input field, so it should only move at character address positions other than the character code written in the code memory or the null code. controlled. Note that 9 is an input field mark.

In this conventional method, although there is a feature unique to graphic displays that allows characters to be displayed at any screen position using graphic addresses, displaying characters in input fields requires the code memory to be made compatible with character addresses. Because of this, only character addresses could be displayed, which was a major drawback in terms of screen display quality.

In view of these points, the present invention aims to provide a graphic display device capable of high-quality screen display in which characters in an input field can be displayed using graphic addresses. An example will be described according to the drawings.

FIGS. 3 and 4 show an example of a display screen and a code memory configuration diagram showing an embodiment of the present invention, both of which correspond to FIGS. 1, 2, and 2.

In Fig. 3, 7' is an input field character display area corresponding to 7 in Fig. 1, and the input field is not a character address, but an arbitrary graphic address using the circuit block configuration shown in Fig. 5, which will be described later. The code memory shown in Fig. 4 is configured to store character codes and address correction information ΔX, ΔY for displaying characters as graphic addresses in correspondence with character addresses. . Input field 7' from the calculator
_{When the first character of} It is detected that the character belongs to the section, and the character display section of this display screen is changed to X _C = 2,
Y _C = 1 lower left corner P ₀ graphic address X _G =
Address ΔX = 15 as a deviation from 12, Y _G = 15
-12=3 and ΔY=15-11=4 are added and written to the memory cell as one data together with the character code of the code memory for the character address X _C =2, Y _C =1.

Thereafter, a series of input fields are set in the code memory in the same manner. The cursor indicating the character input position from the input device must be controlled so that it exists only within the input field, so the character code in the code memory is indexed and the deviation address ΔX, Read out ΔY and calculate the graphic address at the lower left end of the character section where the cursor should be displayed, that is, the position of the basic display section, from the graphic address corresponding to that character address and the deviation addresses ΔX and ΔY. Display the cursor at that position. When a character is input from an input device to the cursor position, the character address corresponding to the cursor position is known, so the input character code is written to the code memory corresponding to this, and this is read out to move the cursor from the deviation address. Similarly, calculate and display the graphic address to be displayed. In the example in Figure 3, the character display area is 6 x 8 dots, so ΔX, ΔY
It suffices if both have 3 bits. In other words, in the present invention, if a deviation address is provided and an extra memory corresponding to this address is added, it will always be about 6 bits (3 binary bits x 2), so there is no problem.

According to the present invention, in a graphic display device having such a conventional code memory configuration, a deviation address from the basic display section of the screen is written in the code memory together with input information.

In Fig. 4, in addition to the 16 x 8 character codes corresponding to the combinations of character addresses X _C 0 to 15 and Y _C 0 to 7 as character codes as in Fig. 1, deviation addresses ΔX and ΔY are used as address correction information. The stored code memory is shown. For example, assuming character code 1 is at character address X _C = 2, Y _C = 1,
It is shown that the deviation address ΔX=3, ΔY=4 of P ₀ →P ₁ is further added to the area 7'.

Next, FIGS. 5 and 6 are circuit block diagrams of a graphic display device according to an embodiment of the present invention, and diagrams showing examples of display data strings from a computer. In FIG. 5, display commands and display data are received by the input/output control unit 11 from the computer 10, and the display commands and display data are directly transmitted to the microprocessor 1 via the common bus 21.
Pass it to 2. The microprocessor 12 analyzes the display command, determines whether the display data to be passed thereafter is dot display data, character pattern data, vector display data, or input field character display data, and determines the subsequent display data according to that determination. The display block, that is, the dot generator 17, the character generator 16, or the vector generator 15, or any other display data is accessed and activated. Therefore, if it is a character display command, the character code passed thereafter is accessed by the character generating section 16 via the common bus 21 and written into the refresh memory 18. Then, the video signal generating section 19 periodically reads out the contents of the refresh memory 18, and displays the image on the display screen of the CRT 20 to display characters. If it is a vector display command, the vector length data passed thereafter is accessed by the vector generator 15, and the vector is displayed as an image in the same manner as the above-mentioned C character code. Furthermore, when using the input field character display command, calculate the deviation address from the graphic address at that time and the address of the code memory to which the character code to be passed thereafter will be written.
When the character code is passed, it is sent to the character generation section 16 to display the character at the graphic address at that time, and at the same time, the character code is sent to the previously calculated address in the code memory 14. Write the deviation address that was placed and increment the code memory address by 1 in preparation for the next location. The character generation unit 16 is provided with a function to update the graphic address to the display position of the next character after displaying a character, so if character codes are subsequently passed, the deviation address of consecutive characters will be the same value, for example.
Since ΔX=3 and ΔY=4 of P ₀ →P ₁ remain, there is no need to leave the deviation address as is and recalculate.
Therefore, the deviation address is calculated when the input field character display command is received, or when the graphic address itself is changed by the graphic address set command, that is, when the deviation address ΔX=3, ΔY=4 of _P1 is changed. You only have to do it in time. Note that 13 is a program memory and a data memory.

Next, using the above-mentioned property, the input/output control unit 11 is provided with a deviation address holding circuit 11' for ΔX and ΔY, and display commands that require calculation of deviation addresses are passed to the microprocessor 12. , the microprocessor 12 calculates the deviation address and writes it to the deviation address holding circuit 11'.
After writing, it is given directly to the device without involving the computer 10, and the deviation address holding circuit 11' of the input/output control unit 11 adds the held deviation address to the subsequent character code. Direct memory access to code memory 14
The character generator 16 is activated and displayed at the same time as writing is performed using DMA, and by adding a simple circuit, it is possible to realize high-speed display similar to character display other than input fields. Also, when information is input to the input field, the input information is written to the code memory, and at the same time the deviation address is read out and the input information is calculated inversely to the graphic address to be displayed. In other words, from the deviation address to the graphic address can be calculated and displayed. FIG. 6 shows an example of how information is exchanged between the computer 10 and the microprocessor 12 _.
If you want to display from the location Y _G , you can specify where to display this column using the graphics address X _G ,
Y _G indicates that the instruction to the microprocessor is to be performed using the first graphic address set, and the next character display command will move the following characters to the currently specified graphic address X _G , Y _G , and so on. Next, write =, and from then on, it will be set to the input field, and since the input field is the part where humans will enter at first, it will be blank, blank...
... and leave it blank to prepare for the operator. In the case of graphics, a vector display command comes in place of the character display command.

As described above, according to the present invention, the deviation between the code memory address at which the input information is written to the code memory and the unique graphics address is added to the input information by the input field control of the graphic display device, and the input information is written into the code memory. Configure the code memory as follows, calculate the deviation address when setting the input field and write it to the code memory, and when information is input to the code memory, read the address at the same time as writing the input information to the code memory. , the graphic address at which the input information should be displayed is calculated and displayed from the deviation address.

Therefore, in the present invention, by storing the deviation information from the graphic address to be actually displayed along with the character code for each character address corresponding to the input field, it is possible to have only as many code memories as there are display sections. Character input into an input field can now be displayed using any graphic address, input information can be displayed at any position on the screen, and the display quality of the number of strokes can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a display screen according to a conventional method, FIG. 2 is a code memory configuration diagram corresponding to the display screen in FIG. 1, and FIG. 3 is a diagram showing an example of a display screen according to an embodiment of the present invention. , FIG. 4 is a code memory configuration diagram corresponding to the display screen of FIG. 3, FIG. 5 is a circuit block diagram of a graphic display device according to an embodiment of the present invention, and FIG. 6 is an example of a display data string from a computer. FIG. 7': Input field character display, 8: Cursor,
10: Computer, 11: Input/output control section, 12: Microprocessor, 14: Code memory, 15: Vector generation section, 16: Character generation section, 17: Dot generation section, 19: Video signal generation section, 20: CRT .

Claims (1)

[Claims] 1. Deviation between the graphic address unique to the display section occupied when one unit of input information is displayed on the screen in the input/output control unit that receives display commands and display data from the computer, and the graphic address at which the input information is displayed. An address holding circuit is provided, and a storage section for input information and the deviation address is provided in a code memory configured such that the memory cell corresponds to the display section, and the display command is received from the input/output control section. When the display command is an input field character display command, the microprocessor calculates the deviation address from the graphic address given at that time and stores it in the holding circuit of the input/output control section, and also stores it in the holding circuit of the input/output control section. The input field character display data and the deviation address are written into the corresponding memory cell, and for subsequent input field character display data, the input/output control section adds the deviation address of the holding circuit to the display data and writes it into the code memory. Set an input field by inversely calculating and displaying a graphic address at which the display data should be displayed from the deviation address while writing to the corresponding memory cell,
To input information into the input field, a cursor or the like indicating the information input position is read out from the code memory to calculate and display the graphic address corresponding to the input field, and the input device is used to move the cursor or the like to the input field. Graphics is performed by writing information input at a position into a corresponding memory cell of the code memory, simultaneously reading a corresponding deviation address, and inversely calculating and displaying a graphic address to be displayed. Input field control method for display devices.