JPH0113569B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a display indicator control method for controlling indicator display on a display device.

[Conventional technology and problems]

FIG. 1 is an overall system block diagram.
1 is the main storage, 2 is the control storage, 3 is the microprocessor, 4 is the disk control unit, 5 is the disk device, and 6 is the floppy disk drive.
7 is a floppy disk device; 8 is a display control portion; 9 is a display device; 10 is a keyboard control portion; 11 is a key board control portion;
12 is a printer control unit, and 13 is a printer. Main storage 1 stores processing programs and an operating system, and control storage 2 stores microprograms. A data bus is connected to the microprocessor 3. A disk control section 4, a floppy disk drive control section 6, a display control section 8, a keyboard control section 10, a printer control section 12, etc. are connected to the data bus. The output of the disk control unit 4 is connected to the disk device 5,
The output of the floppy disk control section 6 is connected to the floppy disk device 7, the output of the display control section 8 is connected to the display device 9,
Output keyboard 11 of keyboard control section 10
The output of the printer control section 12 is connected to the printer 13. Each of these control units connected to the data bus is controlled by the microprocessor 3 according to the processing program, operating system, and microprogram. The display control unit 8 has a display memory for storing character codes and a character generator for storing character patterns, and the microprocessor 3
Display on the display device 9 is performed based on the control from.

The indicator display method in conventional display devices is a method in which the indicator pattern is stored in a ROM (read-only memory), etc. separately from the character generator, and the display position is controlled by specially decoding the row counter and column counter. Alternatively, there is a method in which a special flag is provided in the display memory and an indicator code is stored in the display memory. However, both of these methods have the disadvantage of requiring special hardware.

[Purpose of the invention]

The present invention eliminates the above-mentioned drawbacks and includes:
The purpose is to write the indicator pattern into a conventional character character generator and to display the indicator using the character character generator without having the indicator pattern as special hardware. .

[Structure of the invention]

In order to achieve the above object, the display indicator control method of the present invention includes a display memory that stores the character code of one screen of the display device sent from the host device, and a character pattern corresponding to the character code. It has a character generator and a display control circuit, and the display control circuit reads the character code of the display memory and displays the character pattern in the character generator corresponding to the character code on the screen of the display device. In the display indicator control method in the display system, a character code display area and a hardware display area are provided on the screen of the display device, and normal characters and an indicator pattern are stored in advance in the character generator, The relationship between normal characters and codes in the above character generator is the same as the JIS code system or EBCDIC code system, and the code assigned to the indicator is the above.
A function code of a JIS code system or an EBCDIC code system or a code included in an invariant code area is assigned, and a host device controls the indicator pattern to be displayed in the hardware-dedicated area. shall be.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 2 is a block diagram showing one example of a specific configuration of a display control section used in the present invention, and FIG.
The figure shows the relationship between codes and character patterns in the character generator according to the present invention, Figure 4 shows the flow of control according to the present invention, and Figure 5 shows the relationship between the code and the character pattern in the character generator according to the present invention. Flow chart showing processing
FIG. 6 is a flow chart showing processing on the microprocessor side during indicator control. In the figure, 15 is a display control circuit, 16 is a memory address register,
17 is a selector, 18 is a display memory,
20 is a display register, 21 is a character generator, 22 is an attribute control circuit, 23 is a shift register, 24 is a video control circuit, 25 is a bus-in register, 14 and 19
is a receiver, 26 is a driver, 27 is a display area,
Reference numeral 28 indicates a hardware-only area row, and 29 indicates an indicator display area.

The display control section 8 is connected to the microprocessor 3 via a data bus, as shown in the overall system block diagram of FIG. 1, but FIG. 2 shows the specific internal configuration. be. An input terminal of receiver 14 is connected to a data bus;
Its output terminal is memory address register 16
, an input terminal of the receiver 19 , and an input terminal of the display control circuit 15 . A memory address read terminal of the display control circuit 15 is connected to one input terminal of the selector 17,
The raster address read terminal is connected to the raster address input terminal of the character generator 21, and the output terminal for synchronization signals etc. is connected to the video control circuit 2.
It is connected to the input terminal for the synchronization signal, etc. of No. 4. The output terminal of memory address register 16 is connected to the other input terminal of selector 17. The output terminal of selector 17 is connected to the address terminal of display memory 18. The data terminal of display memory 18 is connected to display register 20.
, the input terminal of the bus-in register 25 , and the output terminal of the receiver 19 . The output terminal of display register 20 is connected to the input terminal of character generator 21 and the input terminal of attribute control circuit 22. The output terminal of character generator 21 is connected to the input terminal of shift register 23. The output terminal of shift register 23 is connected to the display dot data input terminal of video control circuit 24. The output terminal of the attribute control circuit 22 is connected to the video control circuit 2.
It is connected to the input terminal for the attribute signal, etc. of No. 4. The output terminal of bus-in register 25 is connected to the input terminal of driver 26. driver 26
The output terminal of is connected to the data bus. The character generator 21 stores character patterns according to the code table shown in FIG.

An overview of display control in the display control section of FIG. 2 will be explained. First, a display memory address is set in the memory address register 16. Display memory data is stored in display memory 18 via receiver 19. The address of display memory 18 where data is stored is specified by memory address register 16. When data is stored in the display memory 18 and a start command is applied to the display control circuit 15, a memory address signal from the display control circuit 15 is sent.
The contents of display memory 18 are sequentially read out and set in display register 20 by MAO or MAN. Character pattern data (row elements) are transferred from character generator 21 to shift register 23 according to the contents of display register 20 and raster addresses RA0 to RA4 from display control circuit 15.
supplied to The character pattern data from the character generator 21 is transferred to the shift register 23.
The data is converted into serial display dot data and supplied to the video control circuit 24. Serial display dot data from the shift register 23 and a synchronization signal from the display control circuit 15 are input to the video control circuit 24, and the output of the video control circuit 24 performs display display. bus·
The in register 25 is used, for example, when reading the contents of the display memory 18. The attribute control circuit 22 instructs the video control circuit to reverse, blink, etc., using the attribute code read into the display register 20.

FIG. 3 is a diagram showing the relationship between codes and character patterns in the character generator according to the present invention. As you can see from Figure 3, this table is based on EBCDIC
In this method, an area conventionally allocated as a function code or invariant code area in a code table is allocated to an indicator pattern. In other words, in the table of Figure 3, the upper hexadecimal digits represent the horizontal direction and the lower digits represent the vertical direction, and the areas 0 to 3 in the horizontal direction and 0 to F in the vertical direction are assigned to the indicator pattern. , the horizontal direction is 4
to F, areas with vertical direction from 0 to F are EBCDIC
Like the coding system, it is usually assigned to characters.

The display device 9, as shown in FIG.
A display area 27 of 24 lines, 80 columns, and 1920 characters and a hardware-only area line 28 are provided. This hardware-only area row 28 is the 25th row. An indicator pattern is displayed in this hardware-only area row 28, as shown by symbol 29. Display area 27
25 rows and 80 columns including hardware dedicated area row 28
A display memory of 2000 characters is provided. When indicator codes X▼10▼ and X▼20▼ are given, the system availability indicator is displayed as shown in FIG. When the display device receives a message from the system or another work station, the message receiving indicator will display X▼11▼ and X.
This is done by giving the indicator code ▼21▼. The indicator of the occurrence of a keystroke error indicating operator error, keyboard input error, or prohibition of keyboard operation is displayed by giving the indicator codes X▼13▼ and X▼23▼. . These operations are performed at the hardware level, including microprograms, regardless of the processing program.

The flow of control will be explained below with reference to FIG.
On the keyboard 11, when the print key is pressed, the indicator codes of X▼19▼ and X▼29▼ are transferred to display memory 1 by the microprogram.
It is written to the hardware-only area row number 8. Similarly, when pressing the insert key or when a keystroke error occurs, press X▼12▼ and X▼22▼, or X▼13▼ and X▼23▼
The indicator code is written to the hardware-only area row of display memory 18. When specifying a device at ιMPL/ιPL, the indicator codes of X▼16▼ and X▼26▼ are written to the hardware-only area row of the display memory 18 by the microprogram. Similarly, when specifying the memory dump of the floppy disk device 7, the microprogram selects X▼15▼ and X▼25▼, X▼17▼ and X▼27▼, and
The indicator code ▼28▼ is written to the hardware-only area row of the display memory 18. When the system is available, the operating system issues an indicator set command, and the microprogram writes the indicator codes X▼10▼ and written. Other work/
Even when a message is received from a station, etc. (while receiving a message), the operating system issues an indicator set command, and the microprogram executes X▼11▼ and X▼
21▼ indicator code is displayed.
It is written to the hardware-dedicated area row of the memory 18. In this way, the operating system,
An indicator code is written to the hardware-dedicated area row of the display memory 18 depending on the contents of the microprogram or hardware.

The processing program then displays the
The flow of processing performed by the microprocessor when a write macro is issued will be explained with reference to FIG.

Receive code from processing program.

It is determined whether the received code is within the range of 0 to 3 in the horizontal direction and 1 to F in the vertical direction.

If Yes, perform the process; if No, perform the process.

If the received code is in the range 0 to 3 in the horizontal direction and 1 to F in the vertical direction, it is determined whether it is a control code.

If Yes, perform the process; if No, perform the process.

Execute control according to the control code.

Convert all codes to Null (X▼00▼) and write to display memory 18.

Write the received code to display memory.

In the case of an initial JOB menu or the like in the operating system, a screen write command is issued, and a character code for the menu screen is written into the display area in the display memory 18 of the display control section.

〔Effect of the invention〕

As is clear from the above description, the present invention has a display memory including a hardware-dedicated area for displaying an indicator, and displays an indicator pattern in the function code or invariant code area of a conventional character generator. The user program is prevented from writing the code to the display memory, and the indicator is controlled and written only at the hardware level (including microprograms).
Therefore, any indicator can be displayed/controlled at the hardware level without having special hardware dedicated to the indicator and without displaying the indicator pattern by the user.

[Brief explanation of drawings]

Fig. 1 is an overall system block diagram, Fig. 2 is a block diagram showing one example of a specific configuration of a display control section used in the present invention, and Fig. 3 is a code and character in the character generator according to the present invention. Figure 4 is a diagram showing the relationship between patterns, Figure 4 is a diagram showing the flow of control according to the present invention, Figure 5 is a flow chart showing the processing on the microprocessor side when writing the display by the processing program, and Figure 6 is the indicator. This is a flow chart showing processing on the microprocessor side during control. 1... Main storage, 2... Control storage, 3... Microprocessor, 4
...Disk control unit, 5...Disk device, 6...
... Floppy disk control unit, 7... Floppy disk device, 8... Display control unit,
9... Display device, 10... Keyboard control unit, 11... Keyboard, 12... Printer control circuit, 13... Printer, 15... Display control circuit, 16... Memory address register, 17...Selector, 18...Display memory, 20...Display register,
21... Character generator, 22... Attribute control circuit, 23... Shift register, 24... Video control circuit, 25... Bus in register, 14 and 19... Receiver, 26...
... Driver, 27 ... Display area, 28 ... Hardware dedicated area row, 29 ... Indicator display area.

Claims (1)

[Claims] 1 A display unit that stores the character code for one screen of the display device sent from the host device.
It has a memory, a character generator that stores a character pattern corresponding to the character code, and a display control circuit, and the display control circuit reads out the character code from the display memory and generates the character
In a display indicator control method for a display system in which a character pattern in a generator is displayed on a screen of a display device, a character code display area and a hardware display area are provided on the screen of the display device, and a character code display area and a hardware display area are provided on the screen of the display device. Normal characters and indicator patterns are stored in the generator in advance, and the relationship between the normal characters and codes in the character generator is determined by the JIS code system or EBCDIC.
The code system is the same as the code system, and the code assigned to the indicator is a function code of the above JIS code system or EBCDIC code system, or a code included in the invariant code area, and the above indicator pattern is assigned by the host device. A display indicator control method characterized by controlling the display to be displayed in a wear-only area.