JPS5949615B2 - CRT input/output device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a CRT input/output device, and more particularly to a CRT input/output device that distinguishes input information from a keyboard or the like from other information.

Conventionally, when a computer inputs display data from a localized CRT input/output device, this display data
There was no distinction in the information itself between whether the information was input from a keyboard uniquely attached to the input/output device, or whether it was information sent back from a computer and displayed.

Therefore, when distinguishing between the two, first send the display information from the computer to the CRT input/output device, and at the same time store the representation information in the auxiliary memory, and then read the information from the CRT input/output device. When loading data, the computer first stores information from the auxiliary memory, compares this information with the information read from the input/output device, and if they match, the computer first stores the information from the CRT. It was determined that the information was sent to an input/output device, and if they did not match, it was determined that the information was not sent from the computer, that is, it was determined that the information was input from a device other than the computer. If the input device other than the computer is a keyboard, the inconsistent information is determined to have been input from the keyboard. In the above conventional example, the process of determination is complicated, especially when the determination is made by a program, a program is required to perform the determination, and furthermore, an auxiliary memory is required, and information is stored in the auxiliary memory. A program to write is also required. The present invention is intended to eliminate the above-mentioned drawbacks, and its main purpose is to provide a CRT input/output device that makes it possible to determine whether information is from an input device such as a keyboard, without comparing the information of the computer itself. This is what we provide.

The gist of the present invention is that when information is input to a CRT display section from an input device such as a keyboard, the information itself is displayed to indicate that it is the information from the input device.

Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is an embodiment of the overall configuration of the present invention.

The computer 1 and the CRT input/output device 100 exchange information through an interface. CRT input/output device 1
00 consists of a CRT control circuit 2, a CRT pure 8, a keyboard 9, and a keyboard control circuit 10. The CRT control circuit 2 includes an interface circuit 3, a buffer 4, a refresh memory 5, a timing control circuit 6, a video signal forming circuit 7, and a pattern generator 11. With the above circuit configuration, the refresh memory 5, buffer 4, pattern generator 11, video signal forming circuit 7, CRT viewer 8
Since the relationship is the same as that of a general CRT display device, a description thereof will be omitted. Therefore, the display process and readout process will be explained with emphasis on the relationship with the computer 1 and the keyboard 9. First, referring to FIG. 1, the process of displaying display data on a CRT viewer will be explained.

In the case of display from the computer side, the display data from the computer 1 is transferred to the interface circuit 3, and in the case of the display from the keyboard side, when a character key on the keyboard 9 is pressed, the data is transferred to the keyboard control circuit 10. operates, generates a character code corresponding to that character key, and transfers it to the interface circuit 3.

The display data transferred to the interface circuit 3 is transferred to the buffer 4 via the data bus DB, whether it is transferred from the computer side or from the keyboard side.
is temporarily stored.

On the other hand, the address of the refresh memory 5 is specified from the interface circuit 3 via the address bus AB, and the contents of the buffer 4 are transferred to that address. Next, the display data written in the refresh memory 5 is controlled by a timing control circuit 6, and is sequentially transferred to a video signal forming circuit 7 via a buffer 4 and a pattern generator 11, where it is converted into a video signal and sent to the CRT. It will be displayed on View 8.

When inputting the information displayed on the CRT viewer 8 to the computer side, the display data stored in the refresh memory 5 is input to the computer 1 via the buffer 4 and further via the interface circuit 3. becomes. Next, keyboard input data (display information) input from the keyboard 9 to the refresh memory 5 will be explained.

FIG. 2 shows the data structure of the display data. This display data consists of status data and character data. The status data includes a one-pit key input cap which is the core of the present invention, double size data, half brightness data,
Consists of protect data, blink data and color code data. The color code data is made up of, for example, 3 bits and enables a total of 8 gradations to be displayed. Other data is 1
It has a bit configuration. Double size data indicates double size at 81", normal size at 0°, and half brightness data indicates "12".
The character is displayed in half brightness with ``0'', the character is displayed with full brightness with ``0'', and the protect data is 61゜, which makes it impossible to write characters from the keyboard.

0° indicates that characters can be written from the keyboard, and the blink data is 01'' to blink characters.

o0 indicates that the characters are not blinked. A character code is inserted into the character data. The part of the above data structure according to the present invention lies in the provision of a key-in case.

The key input value is 01 when it is keyboard input data.
° is set, and the other values are "0°. Therefore, if you set 012 in the key input key when inputting from the keyboard 9, this key input key will be set to 012 in the subsequent processing. By simply determining whether or not is "1°," it is possible to identify whether the input is from the keyboard or the information from the computer side. Next, a more specific example of the present invention will be shown. FIG. 3 is an embodiment diagram specifically showing the relationship among the keyboard 9, the keyboard control circuit 10, the interface circuit 3, and the computer 1. The keyboard 9 has interrupt keys 31A1 cursor keys 31B1 character keys 3
1C1 color designation key 31D. The keyboard control circuit 10 includes an inverter 32, a status setting circuit 34, a status buffer 35, a code buffer 38, a command generation circuit 40, and gates 44, 45, and 46. When the cursor key 31B of the key button is pressed on the keyboard 9, a cursor control code corresponding to that key is created by the code generation circuit 37 and set in the code buffer 38, and at the same time, the command generation circuit 40 generates a cursor control code corresponding to the key button. Generates a corresponding cathode control signal 42, activates the interface circuit 3, and connects the 0R gate 44 and the AN
The D gate 45 transfers the contents of the code buffer 38 to the interface circuit 3.

Since the activation signal of the interface circuit 3 is the cursor control signal 42, input/output addresses of the refresh memory can be set by passing the contents of the code buffer 38 to the address bus AB of the refresh memory. When the interrupt key 31A is pressed, an interrupt control signal 43 is obtained from the keyboard 9 via the code generation circuit 37 and the command generation circuit 40, and the interrupt control signal 43 is sent to the interface circuit 3 and sent to the computer 1. This becomes the interrupt signal.

When the key button color specification key 31D is pressed on the keyboard 9, the status buffer 35 is
color bit 35B is set through status setting circuit 34.

Yes, the key input button 35A of the status buffer 35 is always set to ``15'' via the inverter 32. When the character key 31D of the key button is pressed, the character corresponding to the pressed character key is displayed. The code is code generation circuit 37
At the same time, the command generation circuit 40 generates a character write signal 41 corresponding to the key button, activates the interface circuit 3, and also outputs the OR gate 44 and the AND gate 45. , and the AND gate 46 transfer the contents of the command buffer 38 and status buffer 35 to the interface circuit 3.

In the interface circuit 3, the activation signal is the character write signal 4.
1, the contents of the status buffer 35 and code buffer 38 are transferred to the refresh memory. Through the above procedure, all character data inputted from the keyboard 30 automatically becomes the key input card 12 and is transferred to the refresh memory via the interface circuit 3.

Keyboard input data sent to the refresh memory by keyboard input is sent to the CRT viewer 8 and displayed, or taken into a computer and processed as keyboard input data. Therefore, according to this embodiment, the data transferred from the computer is not saved in the auxiliary memory or compared with the input data later, but the input data can be input from the keyboard. This has the advantage that it is possible to check whether the data is correct or not. Also, in the above embodiments, when a light ben control device is used in place of the keyboard control device, the same effect as that of the keyboard control device can be obtained. Furthermore, it goes without saying that the data structure shown in FIG. 2 above may also be changed depending on the configuration of the keyboard.
In order to reduce the amount of data to be transferred, the interface circuit shown in Figure 1 is provided with a circuit that determines whether the key is pressed when display data is input to the computer, and selects and transfers only those with the key pressed when the display data is input to the computer side. can be reduced.

However, in this case, the usage is limited. Furthermore, the input device may be an input device other than a keyboard. According to the present invention, input from an input device such as a keyboard can be displayed by displaying a message to that effect on input from an input device such as a keyboard, and identification on the computer side becomes extremely easy. Ta.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of an embodiment according to the present invention, FIG. 2 is a configuration diagram of one word of a refresh memory, and FIG. 3 is a diagram of a specific embodiment centered on a keyboard control circuit. . 1... Computer, 2... CRT control circuit, 3... Interface circuit, 4...
・Buffer, 5... Refresh memory, 6.
・．．・・・． Timing control circuit, 7...Video signal forming circuit, 8...CRT viewer, 9...
...Keyboard control circuit.

Claims (1)

[Scope of Claims] 1. Information is exchanged through a computer and an interface, and display data is written in a refresh memory, and input information provided from an input device is stored in the refresh memory, and the display data is stored in the refresh memory according to the contents stored in the refresh memory. A CRT input/output device for displaying on a CRT viewer, wherein input data to be provided from the input device to the refresh memory is displayed as it is provided from the input device. 2. The CRT input/output device according to claim 1, wherein the input device comprises a keyboard.