JPH0430050B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a method for inputting a European language document such as English using a keyboard, temporarily storing it, and displaying the stored document on a display device while modifying and editing the displayed content. The present invention relates to a document processing device that performs printing after printing.

[Prior art]

Daisy wheel printers are often used in printers for this type of document processing devices, such as English word processors, from the point of view of print quality, and the print form is one with a constant character pitch (for example, those called pica, elide, etc.). It is broadly divided into proportional space, in which the character pitch changes depending on the size of the character (referred to as proportional space). Therefore, if the character pitch is constant, the visible display on the display device when inputting a document may be at a constant pitch, but if the character pitch is constant, the visible display on the display device should be a proportional pitch corresponding to the character pitch so that the visible display corresponds to the printed state. It will be easier to understand the status of the entire document if this is done. In other words, in the case of proportional pitch, the position of the characters is different for each line and does not correspond to the top or bottom, so when doing tabulation etc., it is difficult to see the upper and lower lines in relation to each other when displayed at a fixed pitch. Become. However, when a document is visually displayed with a proportional pitch, when correcting or editing a document, the character pitch differs between the upper and lower lines, making it difficult to move the cursor up and down to specify the character to be corrected.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and its object is to provide a first character generator for constant pitch display and a first character generator for proportional pitch display as a character generator for visually displaying on a display device. A second character generator is provided, and these can be selected by external operation to switch between a fixed pitch display and a proportional pitch display on the display device, so that the state of the entire document can be easily understood. Moreover, it is an object of the present invention to provide a document processing device that allows documents to be easily corrected and edited.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1 is a keyboard as an input device, and on the front of this are character keys consisting of multiple alphanumeric keys, "insert", "delete", "correct", etc.
, etc., cursor operation keys for moving the cursor, and operation keys for saving and printing documents, etc. are provided. 2 is a central processing unit for processing signals from the keyboard 1; 3 is a video RAM serving as a memory for storing signals from the central processing unit 2; That is, keyboard 1
When a character is selected, the central processing unit 2 sends the selected character as a character code to the data bus 4, and specifies a storage area via the address bus 5, so that the character is stored in the video RAM 3 in order. ing. 6 is the first one for constant pitch display.
, and 7 is a second character generator for proportional pitch display, the input terminals of which are connected to the data bus 4, respectively.
In the first character generator 6, characters of a fixed pitch corresponding to the character code are stored with spaces on both sides and a fixed character width.
In addition, the second character generator 7 stores the character code and the corresponding proportional pitch character along with spaces on both sides. In this case, the proportional pitch characters have different character widths, so the character width for one character, including the character and the spaces on both sides, differs from character to character. 8 is a parallel signal processing circuit.
A serial converter, which is a first character generator 6 or a second character generator 7
When a parallel signal is input from the central processing unit 2 through the data line 9, the clock signal line 10 is input from the central processing unit 2 to the clock signal line 10.
The output from the parallel-to-serial converter 8 is sent to a display device 12 via a signal line 11. 13 connects the character width signal corresponding to the character code from the data bus 4 in parallel.
This is a character width signal generation circuit for outputting to the serial converter 8. When the first character generator 6 is enabled, this generates a character width signal to the parallel-to-serial converter 8 via the signal line 14. When the second character generator 7 is enabled, a different character width signal for each character code is output to the parallel-to-serial converter 8 via the signal line 14. There is. 15
is a character pitch designation signal line whose signal is changed via the central processing unit 2 when a character pitch designation key (not shown) on the keyboard 1 is operated; Chip enable terminal (CE) of character generator 7 in 2
are connected to the chip enable terminal (CE) of the first character generator 6 via an inverter 16. The first and second character generators 6 and 7 are activated when the chip enable terminal (CE) is negative, respectively, and output a character signal corresponding to the character code from the data bus 4. Therefore, when the character pitch designation signal line 15 is at high level, a low level signal is applied to the chip enable terminal (CE) of the first character generator 6 via the inverter, so that the first character pitch designation signal line 15 is at a high level. At the same time, the character width signal generation circuit 13 starts to output a character width signal of a constant width, and when the character pitch designation signal line 15 is at a low level, the second character When a low level signal is applied to the chip enable terminal (CE) of the generator 7, the first character generator 7 is enabled and operated, and at the same time, the character width signal generation circuit 13 generates character widths that differ for each character code. It will start outputting a signal. Reference numeral 17 denotes a printer as a printing device for reading character codes stored in the video RAM 3 via the central processing unit 2 and printing them on printing paper.

Next, the operation of this embodiment configured as above will be explained. For example, if the printer 17 is a daisy wheel printer and the character pitch is proportional pitch, operate the character pitch specification key (not shown) on the keyboard 1 to select proportional pitch, and then operate the character keys. to enter the document.
Then, the character code of the selected character is sent to the data bus 4 via the central processing unit 2, and at the same time the storage area of the video RAM 3 is specified via the address bus 5, so that the character code is sent to the data bus 4 via the central processing unit 2.
It is stored in the designated storage area of RAM3.
At this time, since proportional pitch is selected on the keyboard 1, the character pitch designation signal line 15 is at a low level, the second character generator 7 is enabled, and the character sent to the data bus 4 is A character signal corresponding to the code is read out from the second character generator 7 and input to the parallel-to-serial converter 8 via the data line 9, and at the same time, the character width signal generation circuit 13 is connected to the data bus 4, the parallel/serial converter 8 outputs a proportional pitch character width signal according to the character code from the character width signal generation circuit 13.
The character signal from the data line 9 is decoded in accordance with the character width signal from the data line 9 and sent to the display device 12 via the signal line 11. The displayed characters (document) are displayed visually with proportional pitch. Next, when you complete the creation of the document and want to make corrections or edits, use the character pitch specification key (not shown) on the keyboard 1.
Operate to select the fixed pitch. Then, the character pitch specification signal line 15 changes to high level and the first character generator 6 is enabled, so when the character code is read from the video RAM 3 via the data bus 4, the first character generator 6 is activated. The corresponding character signal for constant pitch display is read out from the character width generator 6 and input to the parallel/serial converter 8 via the data line 9. At the same time, the character width signal generation circuit 13 is connected to the data bus Since a constant character signal is output every time the character code from 4 is input, the parallel-to-serial converter 8 outputs a constant character signal from the data line 9 in response to the constant pitch character width signal from the character width signal generation circuit 13. The character signal from
On the screen 2, the created document is visually displayed at a fixed pitch. In this state, use the cursor operation keys on the keyboard 1 to move the cursor forward, backward, left, and right to specify, for example, the character or word you want to correct, and perform correction/editing operations as well-known. After completing the process, select proportional pitch again using the character pitch specification key (not shown) on the keyboard 1, and the edited document will be visually displayed in proportional pitch on the screen of the display device 12, and any defects in the overall condition will be displayed. If not, the document creation operation ends.

After completing the document creation as described above, when the print operation key on the keyboard 1 is operated, the character code is read from the video RAM 3 via the central processing unit 2 and the printer 17 is activated. , printing is done at a proportional pitch on the printing paper. In this case, in the above explanation, a daisy wheel printer is used as the printer 17, but a dot printer may also be used. In this case, each character code stored in the second character generator 7 and Each dot of the dot printer may be printed using a corresponding character signal.

〔effect〕

As is clear from the above description, the present invention includes a first character generator for constant pitch display and a second character generator for proportional pitch display as character generators for visually displaying on a display device. By selecting these by operating the character pitch specification key, the display can be switched between fixed pitch display and proportional pitch display on the display device, making it easy to see the overall state of the document. Moreover, it is possible to provide a document processing device that allows for easy modification, editing, etc. In addition, two types of character generators are available for proportional pitch and constant pitch, so the switching speed for proportional pitch and constant pitch is fast, and the response is extremely good.
It does not require a conventional pitch processing circuit, has a simple circuit configuration, and has the advantage of being low cost.

[Brief explanation of drawings]

The drawing is a schematic block diagram illustrating one embodiment of the invention. In the drawing, 1 is a keyboard, 2 is a central processing unit,
3 is a video RAM (memory), 6 is a first character generator, 7 is a second character generator, 8 is a parallel-to-serial converter (signal processing circuit), 12 is a display device, 13 is a character width A signal generating circuit, 15 a signal line for specifying character pitch, and 17 a printer (printing device).

Claims (1)

[Scope of Claims] 1. A central processing unit to which a keyboard is connected; a printing device controlled by the central processing unit; a first character generator for constant pitch display controlled by the central processing unit; a second character generator for proportional pitch display; a character pitch specification key for selectively activating either one of these two character generators; and a key for specifying character pitch that enables the first character generator. a character width signal generation circuit that outputs a character width signal for constant pitch when the second character generator is enabled, and outputs a character width signal for proportional pitch when the second character generator is enabled; a signal processing circuit that processes the character signal output from the character generator based on the character width signal output from the character width signal generation circuit; and a signal processing circuit that is driven by the signal processing circuit to operate the character pitch specifying key. a display device in which a display format of characters on a display screen is switched between a fixed pitch display and a proportional pitch display according to the display device; 1. A document processing device, characterized in that the device prints at a proportional pitch, and when the display device displays a fixed pitch display, the printing device is controlled to print at a fixed pitch.