JPS61296391A - Crt display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to peripheral devices of information processing devices, terminal devices, and OA
The present invention relates to a CRT display device used as a device.

[Conventional technology]

Conventionally, the line position during keyboard data input in a CRT display device has been determined based on the cursor position.

[Problem that the invention seeks to solve]

In the conventional method described above, if you try to modify the display of a line position where data input display has already been completed, you move the cursor to the specified line position and then change the data. Data will be displayed in a line other than the line position, so it may be difficult to read the data during the correction process.
In particular, when the user interrupts work and leaves the CRT display, there is a drawback that it is difficult to quickly find the line position that was changed when restarting using only the cursor display.

[Means for solving problems]

The present invention provides two types of control keys, a first control key and a second control key, on a keyboard, and when the first control key is operated, the line position during data input is detected and the corresponding line position is detected. The data display of only the line position is enabled, and when the second control key is operated, this is canceled.

In other words, the CB, T display device of the present invention has a first CB and T display device provided on the keyboard. a second control key; a decoder that decodes which of the first and second control keys has been operated and outputs a corresponding signal; and a signal that indicates that the first control key has been operated; A matching circuit is activated only when the output is output, and outputs a matching signal when the output of the row counter matches the row designation information of the row register, and a signal indicating that the first control key has been operated is outputted from the decoder. ,
The present invention is characterized in that it includes a control circuit that disables the output of the display memory when no coincidence signal is output.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a CRT display device according to the present invention.

The display memory 17 stores M characters/
Row position information from a processing device (not shown), that is, designation information for an arbitrary row among the N rows, is stored in the 0 row register 1 in which data of row×N rows is stored. column register 7
The 0th row counter 8 sequentially addresses the row positions, and the column counter 9 sequentially addresses the column positions.

The matching circuit 26 outputs an input signal as an operation instruction signal 82, which will be described later. The row selection circuit 5 receives display data 1 from the processing device.
If there is an instruction to write data 86 to 7, the output 2 of the row register 1 is output, and if there is no instruction, the output 4 of the row counter 8 is output 6.

The column selection circuit 11 outputs the output 8 of the column register 7 when there is an instruction to write data 86 from the processing device to the display memory 17, and outputs the output 10 of the column counter 9 when there is no instruction.
Output as . The output 18 of the display memory 17 accessed in this way is stored in the buffer 19, and the output 2o is sent to the character generator 21.
The output 22 is converted into display data by the parallel-to-serial conversion circuit 28, and the output data 24 is converted into data for display by the CR.
'r Displayed on 25. The keyboard register 13 stores input data from a keyboard (not shown).

Input data from the keyboard is stored in the keyboard register 18.
When the data is stored in , a request to take over the data is made to the processing device, although not particularly shown in this embodiment, and the output 14 is transferred as data 37 to the processing device via the selection circuit 85 . If the data is found to be data to be written to the display memory 17, it becomes the output 16 of the selection circuit 15 as data to be written to the display memory 17, and is addressed by the row position information 6 and column information 12. Writing is performed at the character position specified. The keyboard is provided with first and second control keys, and the decoder 28 receives input data 1 from the keyboard stored in the keyboard register 18.
4 and decodes whether the first control key or the second control key has been operated, outputs 29 if the first control key has been operated, and outputs 29 if the second control key has been operated. If so, the output 80 is set to logic 1. Flip-flop 81 sets output 29 of decoder 28 as a set signal, output 8
When 0 is input as the reset signal and the output 29 (set signal) is input, the output 82 functions as an operation instruction signal for the matching circuit 26 that determines that the row position is the specified row position at the time of data input. . A NAND circuit 88 connects the output 82 of flip-flop 81 and the output 27 of match circuit 26.
Input L-1 Only when the output 32 is logic l (indicating that the first control key has been operated) and the output 27 is logic 1, its output 84 becomes logic O, and as a result, the display memory l
Output 18 of 317 is not set to buffer 19. If the output 2 of the row register l and the output 4 of the row counter match, the output 27 of the matching circuit 26 becomes logic O, and the output 84 of the Nant gate 88 is held at logic 1, so the display The output 18 of the memory 17 is normally set in the buffer IO and displayed on the CRT 25. This is retained only for the specified line position, and data display is valid.

When the second control key is operated, the output 80 of the decoder 28 is set as a reset signal for the flip-flop 81 (logic 1), the output 82 becomes logic 0, and the output 84 of the Nant gate 88 is set to process 1. In order to be retained,
The output 18 of the display memory 17 is always normally set in the buffer 19 and displayed on the CRT 25.

〔Effect of the invention〕

As explained above, the present invention provides two types of control keys on the keyboard, and decodes which of these control keys is operated to enable or cancel data display for only the line position during data input. Even if the cursor is moved to correct the display of the line position where the data input display has been completed, the data of lines other than the corrected line position will not be displayed during the movement, and the correction process will be interrupted. This has the advantage that you do not have to worry about switching between pages, and you can quickly find the row device you were changing when you resume work after interrupting your work.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a CRT display device of the present invention. 1... Row register 2... Output 8 of row register l... Row counter 4... Output 5 of row counter 8... Row selection circuit 6... Output f of row selection circuit 6... Column register 8...Output 9 of column register 7...Column counter 10...Output 11 of column counter 9...Column selection circuit 12...Output 1B of column selection circuit 12...Keyboard register 14... Output of the keyboard register 1B 15... Selection circuit 16 for writing data of the display memory 17... Output of the selection circuit 15 17... Display memory 18... Output of the display memory 17 19... Buffer 20... Output 21 of buffer 19... Character generator 22... Output 28 of character number generator 21.
...Parallel-serial conversion circuit 24...Output 25 of parallel-serial conversion circuit 21'S...
- CILT 26... Matching circuit 27... Output 28 of matching circuit 26... Decoder 29... Output of decoder 28 (first control key) 80
...Output of decoder 28 (second control key) 81...
・Solitub-flop 82... Output of flip-flop 81 ゛88...
Nantes Gate

Claims (1)

[Claims] First and second control keys provided on a keyboard; a decoder that decodes which of the first and second control keys has been operated and outputs a corresponding signal; a matching circuit that operates only when a signal indicating that the first control key has been operated is output from the decoder and outputs a matching signal when the output of the row counter matches the row designation information of the row register; A CRT display device comprising a control circuit that disables the output of a display memory when a signal indicating that a control key has been operated is output from a decoder and a coincidence signal is not output.