JPS5933544A - Display control system - Google Patents

Abstract

PURPOSE:To improve the operability for data input and edition, by controlling the display of each character in a data buffer by a display device according to the value of attribute bit to each character only when the specific mode is set. CONSTITUTION:In turning off a mode designation switch, since another input 9 of an OFF circuit is increased to ''1'' level via a resistor 6, so that when the attribute bit value inputted from a data buffer 1 is either ''1'' or ''0'', an output 10 of an OR circuit 5 goes always to ''1'', and all characters in the buffer 1 are transferred to a display device 2 as they are. On the other hand, when a switch 4 is turned on, one input 9 of the circuit 5 is grounded to be at ''0'' level, then the level of the output 10 is displayed 2 through an AND circuit 4 only when the value of the attribute bit read out to the input 8 is ''1''.

Description

TECHNICAL FIELD The present invention relates to a display control system for devices having a display device, such as electronic typewriters and word processors with storage and editing functions.

BACKGROUND OF THE INVENTION Certain electronic typewriters with storage and editing capabilities store keyed characters (letters, symbols, and other control codes) in a data buffer and display the entire contents of the data buffer on a display. This display function has the advantage that editing operations for the contents of the data buffer are easy because all characters manually entered can be confirmed. On the other hand, some input characters may include characters that do not involve horizontal movement of the printer during printing, such as half-line feed control codes, in which case the character position on the display screen and its actual A misalignment occurs between the printed position and the printed position. For this reason, there is a drawback that data input and editing operations for print images are difficult to perform.

On the other hand, some word processors are configured to display only the remaining characters, excluding characters that do not involve horizontal movement of the printer during printing, among the characters input into the data buffer from a keyboard or the like. in this case,
Since the position of each character on the display screen matches the position where they are actually printed on the printer, it is easy to input and edit data for the print image.However, some input characters may not be displayed. Therefore, this method has the disadvantage of poor operability when editing the contents of the data buffer.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a display control method that overcomes the above-mentioned drawbacks.

Summary In the present invention, when a character is input to a data buffer, an attribute bit for display control of the character is added and input. When the mode specifying means specifies a particular mode characterized by attribute bits, the display control means controls the display of each character in the data buffer according to the value of the attribute bit for that character. If another mode in which the attribute bits are disabled is specified, display control according to the value of the attribute bits of the display control means described above is suppressed.

According to such a display control method, for example, if the value of the attribute bit of a character input to the data buffer is set differently depending on whether or not horizontal movement of the printer is involved during printing, the character can be printed simply by switching the mode. The contents of the data buffer can be displayed as is or selectively displayed in accordance with the print image, and the above-mentioned drawbacks in data input and editing operations can be overcome.

Embodiment FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

2 is a data buffer, 2 is a display device, 3 is a display control circuit, and 4 is a mode designation switch.

Data from a keyboard, a data processing section, etc. (not shown) is input to the data buffer 1 and is stored therein. This input data consists of characters such as letters, symbols, and other printer control codes (for example, A, 5CII codes), and attribute bits (one bit per character) for controlling their display.

The display control circuit 3 includes an AND circuit 4, an OR circuit 5, and a resistor 6. The characters in the data buffer 1 are read out in sequence and supplied to one input cuff of the AND circuit 4. Further, the attribute bits in the data buffer 1 are read out in synchronization with character readout, and are supplied to one input 8 of the OR circuit 5.

Turn off mode designation switch 4 (first mode)
, the other input 9 of the OR circuit 5 is pulled up to the ``1'' level through the resistor 6, so that the value of the attribute bit input from the data buffer 1 becomes +1. ．． Whether it is 111 or 0'', the output 10 of the OR circuit 5 is always at the ``1'' level.

The output 10 of the OR circuit 5 is connected to the other input of the AND circuit 4.

Therefore, if the second mode is specified,
The characters read into the AND circuit 40 input cuff are transferred as they are to the display device 2 via the AND circuit 4. In other words, data (all characters in the sofa 1 are displayed as they are on the display device 2).

On the other hand, when the mode designation switch 4 is turned on (second mode), one input 9 of the OR circuit 5 is grounded, and the II
Since it is fixed at the OI+ level, its output 100 level is determined according to the value of the attribute bit read at input 8. Therefore, only characters whose attribute bit is "1" are sent to the display device 2 through the AND circuit 4 and displayed.

Suppose now that data as shown in FIG. 2 is input to the data buffer 1. Note that each character is shown as a pattern when displayed on the display device 2. Character 21 (
)・-hook line feed code), same 22
()・-No line feed call ・) is also a control code that does not involve moving the printer's water 1' during printing, and attribute bits 24 and 25 for this are set to 0. . Character 23 (tab code 1) is a control code that is not printed, but since it involves printer movement, its attribute bit 26 is set to IT I IT. All other characters are character codes to be printed and naturally involve horizontal movement of the printer, so the attribute bit for them 1-) is 1''''.

In such a case of manual operation, if the first mode 1 is designated, the screen of the display device 20 will be displayed as shown in FIG. 3(a). If the second mode 1. is specified, the screen will be displayed as shown in FIG. 3 (b). Note that 27 and 28 each have one tab set master.

Looking at Figure 3 (b), tabco-1, 2. The next character (X) is displayed correctly in the position of the print mark 27, and the non-printable characters 21 and 22 have been deleted from the screen. In other words, the human data is displayed as a printed image.
, and the second mode 1.'', it is easy to input and edit data assuming a Zolin image.

On the other hand, when looking at FIG. 3(a), not only all characters are displayed, but also the character (X) next to the tab code 230 is displayed at the position of the tab set mark 28 that is one step ahead. In this way, in the first mode, the display is completely different from the print image, but since all the manually created characters are displayed, editing the contents of the take buffer 1 is easy.

Therefore, by appropriately switching the mode, it is possible to easily perform any operations such as inputting and editing data in a print image and editing data buffer contents.

Note that the display control means and the mote designation means are not limited to the display control circuit 3o 6 and mode designation switch 4 described above, and the configuration can be changed as necessary.

Effects As described in detail in Section 2, the present invention has a configuration in which an attribute bit is introduced and attribute pin display control is enabled or disabled by switching modes. As explained, there are effects that can improve the usability of data entry and editing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention;
FIG. 2 is a diagram showing an example of input data, and FIGS. 3(a) and 3(b) are diagrams showing screen displays of the input data of FIG. 2 in the first and second modes, respectively. DESCRIPTION OF SYMBOLS 1... Data buffer, 2 - Display device, 3... Display control circuit, 4... Mode designation switch. Representative Patent Attorney Makoto Suzuki ゛・.

Claims (1)

[Claims] Ke) In a device having a display device that displays characters in a data buffer, an attribute bit for display control of the character is input into the data buffer along with the character, and a mode is specified. and means for controlling the display of each character in the data buffer by the display device in accordance with the value of the attribute bit for each character only when the means specifies a particular mode. Characteristic display control method. (2) When the specific mode is specified, the means for controlling the display selectively controls only those characters whose attribute bits have specific values among the characters in the data buffer. 1 to the display device, and if a mode other than the specific mode is specified, all characters in the data buffer are transferred to the display device regardless of the value of the attribute bit. A display control method according to claim 1, characterized in that: