JPH0580908A - Crt display device - Google Patents

Abstract

PURPOSE:To obtain a history of data of all keys which are depressed on a keyboard without making a processing time long by providing a history memory, an address register, and a changeover switch. CONSTITUTION:The CRT display device which displays data transferred from a data processor or data 13 inputted from a keyboard is equipped with the history memory 29 which receives and stores input data of respective keys, arranged on the keyboard, as history data. Further, the CRT display device is provided with the address register 27 which holds the storage positions of the input data of the keyboard stored in the history memory 29 and the changeover switch 31 which decides whether or not the input data of the keyboard is stored in the history memory 29. Therefore, history gathering can be performed simultaneously in parallel to the processing of the input data 13 from the keyboard. Consequently, the history of data of all the keys can be obtained without making the processing time of a computer system long.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT display device, and more particularly to a CRT display device used in peripheral devices and terminal devices of information processing devices and OA equipment.

[0002]

2. Description of the Related Art As a history of input data from a keyboard, a conventional CRT display device recognizes a command instructed from a series of input data and collects only the minimum necessary commands and data. I was going.

[0003]

DISCLOSURE OF THE INVENTION The conventional CRT described above
Since the display device cannot collect the history of the data of all the entered keys, it has a drawback that the cause of the trouble due to the erroneous operation of the keys cannot be determined. Also, the processing time (performance) of the computer system is the amount of software processing required.
Has the drawback of decreasing

[0004]

A CRT display device of the present invention is a CRT display device for displaying data transferred from a data processing device or data input from a keyboard, and each of them is arranged on the keyboard. A history memory that receives and stores the input data as history data in response to pressing of a key, an address register that holds a storage position of the input data of the keyboard stored in the history memory, and the input data of the keyboard And a changeover switch for changing whether or not to store the history memory.

[0005]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the CRT display device of the present invention. As shown in Figure 1, CRT
When the (cathode ray tube) 26 displays characters of M lines and N lines, the line register 1 stores line position information from a data processing device (not shown), that is, designation information of an arbitrary line of M lines. , And the column register 7 stores column information, that is, N
The display memory 18 stores display information of M lines × N characters / line to be displayed on the CRT 26 by storing designation information of the character position of the character / line.

When there is no instruction from the data processor to write the transfer data 34 to the display memory 18, the output 4 of the row counter 3 for sequentially addressing the row positions becomes the output 6 of the selection circuit 5, The output 10 of the column counter 9 for sequentially addressing the column position becomes the output 12 of the selection circuit 11 and is sequentially addressed as the address information of the display memory 18.

The output 19 of the display memory 18 is stored in the buffer 20, and then the output 21 is converted into display data 23 by the character generator 22 and output as a serial bit string by the parallel-linear conversion circuit 24. 25
The data is displayed by inputting to the CRT 26.

On the other hand, in the data transfer to the data processor, any one of the row register 1, the column register 7, the keyboard register 14, the display memory 18 and the history memory 29 is selected by the selection circuit 35, and its output 36 is read. Transferred as data.

On the other hand, the address register 27 of the history memory 29 stores the key data 13 in which a key of the keyboard is pressed.
The storage position to be stored in the history memory 29 is shown. When the power is turned on, it is selected as the lowest address (address 0), and after accessing the highest address (address k), it is automatically restored to the lowest address.

The history memory 29 is a memory for storing the key data 13 in which a key of the keyboard is pressed as history data, and has a maximum storage capacity of k characters.

Further, the change-over switch 31 is a change-over switch for setting whether or not the key data 13 obtained by pressing a key on the keyboard is written as history data in the history memory 29, and when it is set to the ON side. , The output 33 of the filter circuit 32 is held at logic "0",
The writing of the data 15 to the history memory 29 is permitted.
When it is set to the OFF side, the output 33 of the filter circuit 32 is held at the logic “1” and the writing of the data 15 to the history memory 29 is prohibited.

And a keyboard (not shown)
When inputting data from, the pressed key data 13 is stored in the keyboard register 14 and becomes the output 17 of the selection circuit 16 and is limited to the data keys excluding the control key,
It is stored as display data in the display memory 18.

On the other hand, when the changeover switch 31 is set to the ON side, history data is stored in the storage position of the history memory 29 indicated by the contents of the address register 27 without distinction between the control key and the data key. To be done.

At the time of collecting the history data, the output 30 of the history memory 29 becomes the output 36 of the selection circuit 35 and is transferred as the history data in response to the reading instruction of the history memory 29 from the data processing device.

This operation is repeatedly executed while updating the address register 27 up to k times, which is equal to the maximum storage capacity (k characters) of the history memory 29.

[0017]

As described above, the CRT display device of the present invention can simultaneously process history data in parallel with the processing of input data from the keyboard, thus reducing the processing time (performance) of the computer system. It is possible to obtain the history of the data of all the keys pressed by the keyboard without the need to do so.

[Brief description of drawings]

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

[Explanation of symbols]

 1 row register 2 row register output 3 row counter 4 row counter output 5 selection circuit 6 selection circuit output 7 column register 8 column register output 9 column counter 10 column counter output 11 selection circuit 12 selection circuit output 13 keyboard Data from 14 Keyboard register 15 Output of keyboard register 16 Selection circuit 17 Output of selection circuit 18 Output of memory 19 Output of display memory 20 Buffer 21 Output of buffer 20 22 Character generator 23 Output of character generator 24 Parallel-serial conversion circuit 25 Output of parallel-series conversion circuit 26 CRT (cathode ray tube) 27 Address register 28 Output of address register 29 History memory 30 Output of history memory 31 Changeover switch 32 Filter circuit 33 Output of filter circuit 3 Transfer data to the transfer data 35 selection circuit 36 the data processing apparatus from the data processing device

Claims (1)

[Claims] 1. A C for displaying data transferred from a data processing device or data input from a keyboard.
In the RT display device, a history memory for receiving and storing input data as history data in response to pressing of each key arranged on the keyboard, and a storage position of the input data of the keyboard stored in the history memory A CRT display device comprising: an address register for holding the input data; and a switch for switching whether or not to store the input data of the keyboard in the history memory.