KR0163480B1 - Education computer network structure - Google Patents

Abstract

The present invention relates to a computer network construction apparatus and method for allowing one educator to perform computer education for a large number of trainees in a computer education classroom, and the like. In the related art, an education is performed by a personal computer installed offline for each trainee. All of the trainees were inefficient because they had to move to see the screen of the other party.

The present invention has an advantage that a single educator can efficiently perform a plurality of trainees by additionally connecting a controller capable of transmitting screen contents to a computer system and establishing a network of computer education systems by multiple accessing such computer systems. Invention.

Description

Educational computer network construction device and method

1 is a block diagram of a general personal computer system.

2 is a block diagram of a computer education system network according to the present invention.

Figure 3 is a system configuration for explaining the controller for educators and trainees in accordance with the present invention.

4 is an internal configuration diagram of a buffer unit in the switching unit according to the present invention.

5 is a diagram illustrating an embodiment of a connection state of a switching unit between an educator system and an educator system according to the present invention.

Figure 6 is a controller front plate configuration of the educator system according to the present invention.

Figure 7 is a controller front plate configuration of the educator system according to the present invention.

8 is a flowchart of an educator system according to the present invention.

9 is a flowchart of a trainee system according to the present invention.

10 shows an interrupt processing routine according to the present invention.

* Explanation of symbols for main parts of the drawings

10,10s: Central processing unit 20,20s: Input device

30,30s: Output device 40,40s: Controller

41,41s: central processing unit 42,42s: first switching unit

43,43s: 2nd switching part 44,44s: LCD display part

45,45s: Keypad 46,46s: LED Indicator

421 ~ 425,431,432: Buffer part K ₁ ~ K ₃ , K _1S ~ K _3S : Buffer

The present invention relates to an educational computer network construction apparatus and method for enabling a single educator to perform computer education for a plurality of trainees in a computer education classroom, and more particularly, to display an output screen of an educator in real time through an online communication network. The present invention relates to an educational computer network construction apparatus and method for displaying on an output device or displaying an output screen of a trainee through an output device of an educator.

In general, a computer school or a computer education institution wants to check whether a trainee understands the education correctly for the guidance of a trainee while one educator is conducting computer education for a large number of trainees. It is necessary to check the contents of the screen, and on the contrary, the trainees need to see the contents of the educator's display in order to know whether they are properly performing the training contents such as program writing. If an educator transmits his / her screen contents to the educator while learning or working with his computer system, he / she can provide effective instruction or lecture.

However, since the computer system for the educator and the computer system for the educator are not connected online, they have to go to the place where the educator or the educator wants to see directly and point out or discuss the contents of the education or errors, so they have to make a round trip. There were various disadvantages such as time-consuming and time-consuming, and disturbing the education of the people around.

The present invention has been invented in view of the above circumstances, and it is possible to check the output of the counterpart online by sitting at his seat without having to travel between the educator and the trainees, and the educator can output the result displayed on his monitor. It can be transmitted to the monitors of all trainees and printed out. In contrast, an educator can output the outputs of the trainees designated by him or her through his own monitor, and such data transmission operation is performed by one trainee or schedule for each educator. An object of the present invention is to provide an apparatus and method for constructing an educational computer network that can be performed on a group or of all students.

Hereinafter, the configuration and method of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, in the computer network construction apparatus for the education system in which the input device 20 and the output device 30 are connected to the central processing unit 10, the input / output devices 20 and 30 are each via a controller 40. Is connected to the central processing unit 10, the input device 20 has a key data signal output from the input device 20 according to the control signal of the central processing unit 41 in the controller 40 of its own central processing The central processing unit 10 is connected to the controller 40s of another person via the device 10 or the transmission bus L ₁ , and the central processing unit 10 is connected. The output terminal outputs the image output data outputted from the central processing unit 10 through its own output device 30 or the transmission bus L ₁ according to the control signal of the central processing unit 41 in the controller 40. In the structure that the output device 30 is connected via the second switching unit 43 to be transmitted to the controller (40s) of the It can control.

In addition, the educational computer network construction apparatus according to the present invention is connected to the central processing unit 10 via the first switching unit 42 of the controller 40 to the input device 20 and the controller to the central processing unit 10 An output device 30 is connected via the second switching unit 43 of 40 to constitute a computer system 100 for computer, and similarly, the central processing unit 10s and the input / output device 20s and 30s ) And the controllers 40s are composed of the computer system for the trainees 200 to N, respectively, and each first switching of the controller 40 for the teacher between the computer system for the educator 100 and the computer system for the trainees 200 to N. Each of the first switching portion 42s and the second switching portion 43s of the controller 40s for the trainees is connected to the portion 42 and the second switching portion 43 in parallel.

As a method for realizing this, the computer system for an educator performs initialization upon supplying power to set an interrupt generation cycle, and then determines whether key data is input from the keypad 45, and input of key data. If it is present, the step of displaying it on the LCD display 44, and if it is determined that the cancel key (S ₃₃ ) or the execution key (S ₃₄ ) is not input, and it is determined that it is not entered, the key data is stored and whether to input the next key data. If it is determined that the cancel key (S ₃₃ ) or the execution key (S ₃₄ ) is input, determining whether a command formed by combining the key data is correct, and as a result, the command is not correct. If it is determined, perform the step of determining whether the key data is input again while deleting the key data. Well it consists of determining whether a key input for a command.

In addition, the computer system for the trainee performs a step of setting an interrupt generation cycle by performing initialization upon power-on, and then determining whether key data is input from the keypad 45s, and if there is an input of key data, the LCD display unit ( 44s), determining whether the command is correct afterwards, and if it is determined that the command is not correct, determining whether to input the key data again, and if the command is correct, after executing the command Determining whether a key is input for the next command.

1 is a block diagram of a general personal computer system. The input device 20 includes a keyboard 21, a mouse 22, and the like, and the output device 30 includes a monitor. 10 is to store the result of processing the command and data by the input device 20 and output the result to the output device (30).

Here, the lines input to the central processing unit 10 from the keyboard 21 or the mouse 22 in the input device 20 are composed of two lines, that is, a line for data input and a line for ground connection.

In addition, the transmission line connected between the central processing unit 10 and the output device 30 is a color signal of red (R), green (G), blue (B) to display data when the output device 30 is a color monitor It consists of six transmission lines, including three color signal transmission lines for transmitting the signal, a vertical synchronization signal (V) transmission line, a horizontal synchronization signal (H) transmission line, and a transmission line for ground (GND) connection.

However, such a configuration is possible to input and output data on its own, but since it is not possible to send and receive data with others, it is inconvenient to change the position in order to see the output of others. In this case, it was very inconvenient for the educator to go to the position of the trainee and check the progress or correct the error.

2 is a block diagram of a computer education system network according to the present invention.

Educator computer system 100 has a central processing unit 10 and the input and output device 20, 30 is connected via a controller 40, the input device 20 is the keyboard 21 and the mouse 22 Consists of

In addition, the computer system for trainees 200-N is also connected to the central processing unit 10s and the input / output devices 20s and 30s via the controller 40s in a similar manner, and the input device 20s is the keyboard. 21s and the mouse 22s.

The Educator controller (40s), a bar, transfer bus connected in parallel to the computer system 100, the controller 40, each of the computer systems (200 ~ N) for the trainee via the transfer bus (L ₁₎ of the (L ₁ ) Are three color signal transmission lines for transmitting color signals of red (R), green (G), and blue (B), vertical synchronization signal (V) transmission lines, and horizontal synchronization signals (H), as described later in FIG. ) Transmission line, transmission line for ground (GND) connection, transmission line for data transmission and reception of keyboard 21 and mouse 22 of input device 20, identification code for each trainee and set unit for education purpose of trainee It consists of a data transmission line (D) for selective control.

3 shows a system configuration for explaining a controller for educators and trainees according to the present invention.

The controller 40 for the educator and the controller 40s for the educator are both the central processing unit 41, the first and second switching units 42 and 43, the LCD display unit 44, the keypad 45 and the LED display lamp, respectively. It consists of 46 pieces.

In the following description, descriptions and drawings unnecessary for components that perform the same or similar functions as those of the computer system 100 and the controller 40 for the computer system 200 to N and the controller 40s. In order to avoid duplication, the number is given the same number as in the computer system for educators, and the subscript s is added after the number. Therefore, if the code to which the subscript s is assigned in the explanation of the computer systems for the trainees 200 to N is not shown in the drawing, it corresponds to the components of the corresponding code in the computer system for the trainees 100 and the computer system for the trainees. Among the components of the computer system for students and students, which are not described separately, they are configured identically.

The data terminal of the central processing unit 41 in the educator controller 40 is connected to the data terminal of the central processing unit 41s in the educator controller 40s via the data transmission line D, which is a bidirectional data transmission. This is a possible track.

Each buffer unit 421 to 423 on the first switching unit 42 are connected on the transmission line of the red, green, and blue signals R, G, and B transmitted from the central processing unit 10 to the output unit 30. In addition, the buffer unit 424 and 425 are connected to the vertical synchronization signal V and the horizontal synchronization signal H transmission line, and the ground GND line is directly connected to each other. Each input terminal of the central processing unit 10 is connected to the data output terminal of the keyboard 21 and the mouse 22 via the buffer units 431 and 432 of the second switching unit 43.

Each of the buffer units 421 to 425 and the buffer units 431 and 432 constituting the first switching unit 42 and the second switching unit 43 output their respective input signals from the central processing unit 41. In accordance with the control signals (C ₁ ~ C ₇ ) to transmit to the central processing unit 10 and the output device 30 of the computer system or to the controller of the other person through the transmission bus (L ₁ ), Here, the buffer units 421 to 423 are configured with video buffers as described below, and the buffer units 424 and 425 and the buffer units 431 and 432 are configured with tristate buffers. have.

The buffer parts 421 to 425 and the buffer parts 431 and 432 of FIG. 3 are respectively configured as shown in FIG. 4. That is, the buffer K ₁ is connected in parallel to the buffer K ₂ (K ₃ ) connected in series between the input terminal and the output terminal of the buffer unit, and a tine is connected to the connection point between the serially connected buffers K ₂ and K ₃ . It is connected to the connection point between the buffer unit buffers (K _2S) (K _2S) in the computer system.

5 is a diagram illustrating a connection state between the controllers 40 and 40s between the educator system and the trainee system, that is, the buffer units in the switching sections 42 and 43 and the switching sections 42s and 43s according to the present invention. A diagram of one embodiment.

Here, the buffer unit 421 for switching the red signal R in the controller 40 of the educator computer system 100 and the red signal Rs in the controller 40s of the computer systems 200-N for the educator are switched. Although only the connection state between the buffer units 421s is described, the green signal G, the blue signal B, the vertical synchronization signal V, the horizontal synchronization signal H, and the keyboard in the educator computer system 100 are described. The buffer units provided on the transmission line for transmitting the data signal and the mouse data signal are also connected to the corresponding buffers in the computer systems 200 to N of the trainees in the same manner and thus are omitted to avoid duplication of explanation. .

6 is a block diagram of the controller front panel of the educator system according to the present invention, and is largely comprised of an LCD display 44 and a keypad 45, and the keypad 45 is a vertical key group 451 in a vertical direction. ) And confirmation related key group 452 and auxiliary function key group 453.

The education-related key group 451 is used to transmit the screen of the educator to the trainee, wherein the full key S ₁₁ is used to transmit the screen of the educator to the entire trainee, and the entire key S ₁₁ is pressed. The buffers K ₁ and K _{2 of the} buffer units 421 to 425 are turned on by the control signals C ₁ to C ₅ of the central processing unit 41 in the controller 40 of the ground educator, and the buffer K is turned on. ₃ ) is turned off while the buffers K _1S (K _2S ) of the respective buffer units 421s to 425s by the control signals C _1S to C _5S of the central processing unit 41s in the controllers 40s of the entire trainees. Is turned off and the buffer K _3S is turned on.

Therefore, the information output from the central processing unit 10 is displayed on the output device 30 of the educator, and the information transmitted from the central processing unit 10 of the educator is displayed on the output device 30s of all the educators.

If the key off key S ₃₅ in the auxiliary function key group 453 is not pressed at this time, letters typed by the educator are displayed on the screen of the trainee. This operation is also applicable to all key operations described below.

When the group key S ₁₂ is pressed, the screen of the educator is output to only a certain group. The controller 40 of the educator and the controller 40s of the educator of the selected group have the previous full key S ₁₁ . The same action as when is pressed is made, and a certain group at this time is set separately at the time of installation of the whole system and can be set for example by division.

When selecting a schedule group, press the group key (S ₁₂ ) in the education key group 451 and press the exhalation increase key (S ₃₁ ) or the exhalation decrease key (S ₃₂ ) in the auxiliary function key group 453. Is displayed on the LCD display 44 and then pressing the execution key (S ₃₄ ) is selected.

At this time, if the cancel key (S ₃₃ ) of the auxiliary function key group 453 is pressed, the operation key (S ₃₄ ) is pressed before the key is pressed. For example, after the educator selects the first group and transmits his screen, the educator presses the group key (S ₁₂ ) in the education key group 451 to transmit his screen to the fifth group, and the auxiliary function key group 453. Press the cancel increase key (S ₃₃ ) while the fifth group is displayed on the LCD display 44 by pressing the exhalation increase key (S ₃₁ ) or the decrease expiration key (S ₃₂ ) on the screen. When the private key S ₁₃ of the education key group 451 is pressed, the screen of the educator is output to only a specific individual, and the controller 40 of the educator and the selected individual educator In the controller 40s, the same function as when the entire key S ₁₁ is pressed is performed, and the characteristics of the individual are distinguished for each trainee computer system 200 ~ N when installing the whole system. Is set to, for example, Which can each be set to give an ID code (identification number).

To select a specific individual, press the private key (S ₁₃ ) in the education key group 451 and press the aerobic increase key (S ₃₁ ) or the aerobic decrease key (S ₃₂ ) in the auxiliary function key group 453. After displaying the unique number on the LCD display 44, pressing the execution key (S ₃₄ ) is selected.

When the group key S ₁₂ is pressed during the operation or when the private key S ₁₃ is pressed, the control signals C ₁ to C ₅ output from their controllers 40s in the computer systems of groups or individuals that are not selected. By this, the buffers K _1S of the respective buffer units 421s to 425s are turned on and the buffers K _2S and K _3S are turned off so that information output from the central processing unit 10s thereof is outputted to its output device 30s. Will be printed).

If the blocking key (S ₁₄ ) was last pressed in the training key group 451, the operation of transmitting the screen contents of the educator from the educator computer system 100 to the educator computer systems 200 to N is canceled, and each output is canceled. The device 30 is to display the information output from their central processing unit 10.

Next, the operation of the confirmation key group 452 will be described.

The confirmation key group 452 is used when the educator wants to output the screen of the trainee through his output device 30.

First, when the entire key (S ₂₁ ) is pressed, the screen of each trainee is displayed on the trainee's output device 30 at regular intervals. At this time, the buffers K ₁ of the respective buffer units 421 to 425 of the educator computer system 100 by the control signals C ₁ to C ₅ of the central processing unit 41 in the controller 40 of the educator. While K ₂ is turned off and buffer K ₃ is turned on, the control signals C _1S to C _5S of the central processing unit 41s in the controllers 40s of the entire trainees are respectively set at regular intervals and sequentially. The buffers K _1S and K _2S are turned on and the buffers K _3S are turned off in each of the buffer units 421s to 425s in the computer systems 200 to N for students.

When the group key S ₂₂ is pressed, the screen of the trainees of the selected group is displayed on the educator's output device 30 at regular intervals, and the central processing unit 41 of the educator's controller 40 is displayed. The controllers 40s of the trainees belonging to the selected group while the buffers K ₁ and K ₂ of the respective buffer units 421 to 425 are turned off and the buffers K ₃ are turned on by the control signals C ₁ to C ₅ . In accordance with the control signals C _1S to C _5S of the central processing unit 41s at the predetermined intervals and sequentially, the buffers K _1S (K _2S ) of the respective buffer units 421s to 425s are turned on and the buffers ( K _3S ) is turned off. The group selection method at this time is the same as described in the education key group 451.

When the private key S ₂₃ is pressed, the screen of the specific trainee of the selected group is displayed on the output device 30 of the educator. The control signal of the central processing unit 41 in the educator's controller 40 The central processing unit in the controller 40s of the selected specific trainee while the buffers K ₁ and K ₂ of the respective buffer units 421 to 425 are turned off and the buffer K ₃ is turned on by C ₁ to C ₅ ). By the control signals C _1S to C _{5S of} 41s, the buffers K _1S and K _2S of the respective buffer units 421s to 425s are turned on and the buffers K _3S are turned off.

When the previous screen key S ₂₄ is pressed, the screen executed immediately before is displayed on the educator's output device 30 and the screen hold function is performed, which is the whole key S ₂₁ or group. It is used when the user presses the middle of the function (S ₂₂ ) in order to see the previous screen again. In this case, the action of the controller 40 of the educator and the controller 40s of the former trainee is described above. This is the same as when the trainee sends a screen to the educator.

If the continuation key (S ₂₅ ) is pressed to act to advance the screen that was fixed according to the operation of the previous screen key (S ₂₄ ) described above, transmitted to the educator computer system 100 at regular intervals and sequentially. The computer system for the next trainee in a fixed order among the computer systems for the trainees is configured to transmit a screen to the computer system for the trainees 100.

Next, the operation of the help key S ₂₆ is finally explained among the confirmation key group 452.

It is used when an educator wants to see the screen of the trainee by pressing the call key (P ₁ ) installed on the front panel for the trainee as described below. When the trainee presses the call key (P ₁ ), The ID code of the trainee is sequentially stored in the controller 40 of the trainee. The educator presses the Help key (S ₂₆₎ shown in the LCD display unit 44 of the ID code of the trainee a first call educators and the screen of the trainee is displayed by pressing the activation key (S ₃₄₎ in such a state.

After that, if you want to see the screen of the next trainee, press the expiration key (S ₃₁ ). Then, the trainee's ID code sent next is displayed on the LCD display 44, and when the user presses the execution key S ₃₄ at that time, the trainee's screen is output from the output device 30. In addition, the screen of the trainees can be displayed sequentially by pressing and holding the aerobic increase key (S ₃₁ ).

In this case, when the exhalation reduction key (S1 ₃₂ ) is pressed, the last call signal is selected from the call signals sent by the trainee, and the screen contents are output to the output device 30.

Next, the operation of the auxiliary function key group 453 will be described.

The aerobic increase key (S ₃₁ ) is used to select individual trainees or group individually.In the case of individual selection, the ID code of the trainee is sequentially displayed on the LCD display unit whenever the aerobic increase key (S ₃₁ ) is pressed. 44). In addition, in the case of selecting a group, the unit group number of the trainees is sequentially displayed every time the aerobic increase key S ₃₁ is pressed.

At this time, the ID code or group number of the trainee can be displayed and stored in the central processing unit 41 of the controller 40 for the educator and checked by the initial inspection when the entire system is powered on. When the aerobic increase key (S ₃₁ ) is pressed, the stored ID code or group number is sequentially displayed on the LCD display 44 in descending order from low number to high number.

Pressing the exhalation reduction key (S ₃₂ ), as described above, the ID code or group number that is checked and stored when the system is turned on is reduced from the high side to the low side according to the individual or group selection of the educator. ) Is displayed.

When the execution key (S ₃₄ ) is pressed, the screen is transmitted between the educator and the trainee according to the selected function for the individual or group selected by the exhalation increase key (S ₃₁ ) or the exhalation decrease key (S ₃₂ ).

The key off key (S ₃₅ ) is a keyboard or mouse data or an operating system (O) that is pressed after the key off key (S ₃₅ ) is pressed while the educator is watching a screen or showing the screen of the educator. / S) will not appear on the screen. At this time, when the execution key (S ₃₄ ) is pressed, the action by the key off key (S ₃₅ ) is automatically released.

When an educator receives a screen of a trainee and views it through his or her output device 30, in order to input data to the computer system central processing unit of the trainee through his or her keyboard 21 or mouse 22, the screen is displayed. In the state, press the key off key (S ₃₅ ) three times or more and press the execution key (S ₃₄ ) to be possible to enter after that, and pressing the execution key (S ₃₄ ) again, such input action is canceled.

Next, the operation of the controller 40s will be described based on the configuration of the controller front plate of the trainee system shown in FIG.

First, when the trainee presses the call key P1, the call signal, that is, the ID code of the trainee, is transmitted to the controller 40 of the trainee and stored in a storage device such as a RAM provided in the central processing unit 41. At this time, when several people press their pagers (P ₁ ), all are transmitted to the controller 40 of the educator and stored. As described above, the educator confirms the key of the confirmation key group 452 and the increase expiration key (S _31). ) Or the screen transfer operation with the called trainee based on an operation such as an aerobic reduction key (S ₃₂ ). However, if the cancel key (P ₂ ) is pressed, the calling action is canceled and its ID code, which is transmitted to and stored by the educator, is deleted.

In addition, when the learner presses the call key (P ₁ ), the indicator (LED2), which means waiting, is turned on to confirm that he or she is calling the educator. While receiving and watching the screen, the indicator (LED3) lights up to indicate that the educator is watching the screen of the trainee, while the educator receives and sees the screen of another trainee. During execution, the indicator (LED1) lights up to confirm that the computer system for the student is in normal condition. Therefore, two or more indicators do not light up at the same time.

8 shows a flowchart of an educator system according to the present invention.

When the power is turned on first, the initialization is executed and the interrupt generation period is set. Interrupts are continuously generated at regular time intervals in a falling manner. In other words, the computer system of the educator checks whether there are calls from the trainee at regular intervals, and the computer system of the educator examines what instructions the educator executes.

Subsequently, the controller detects whether key data is input from the keypad 45 and displays the key data on the LCD display 44. It is determined whether the cancel key (S ₃₃ ) or the execution key (S ₃₄ ) is pressed, and if it is determined that none of the keys is pressed, it is determined whether the key data is input again while storing the key data that was pressed at that time, and then the cancel key If it is determined that S ₃₃ or the execution key S ₃₄ is pressed, it is determined whether the command is correct. In this case, a single command is formed by storing and inputting several key data in the previous step. If the command is determined to be wrong, the stored key data is deleted and the user waits for input of the key data again. If the command is determined to be correct, the command returns to the state where it waits for input of key data to wait for the next command after executing the command.

On the other hand, if there is a call from the trainee when no key data is entered, an interrupt is generated and it is determined whether the instruction transmitted from the trainee is correct, and after deleting the key data or executing the command according to the result as before. It will return to waiting for key data to wait for the next command.

If there is an instruction to send data to the send / receive data buffer during the execution of the instruction, the interrupt processing routine stores the data and passes the computer of the subject through the first and second switching units 42 and 43, respectively. It also transmits to the system side.

9 shows a flowchart of the trainee system according to the present invention.

When the power is turned on first, the initialization is executed and the interrupt generation period is set. The interrupt action and generation method are the same as in the educator system described above.

In the initialized state, it is determined whether the call key P ₁ is input, and if the input of the key is detected, the key is displayed on the LCD display 44s, and then it is determined whether the command is correct.

At this time, if it is determined that the command is wrong, it deletes the stored key data and waits for input of the key data again.If it is determined that the command is correct, it waits for input of key data to wait for the next command after executing the command. Return to the state.

On the other hand, if there is a data transmission from the educator when no key data is input, an interrupt is generated and it is determined whether the instruction transmitted from the educator is correct, and then the key data is deleted or the command is executed according to the result as before. After that, it returns to waiting for input of key data to wait for next command.

In addition, as in the educator system, if there is an instruction to send data to the transmit / receive data buffer during the execution of the instruction, the interrupt processing routine stores the data, and each of the first and second switching units 42s and 43s. It is also sent to the educator's computer system.

The following describes the interrupt processing routine according to FIG.

The data at the time of interrupt generation is set based on the operation of various keys. When there is a call for data transmission with the counterpart by the educator or the educator, it is generated by the execution key (S ₃₄ ) in the educator system and the call key in the educator system. Is generated by (P ₁ ).

When a call interrupt occurs based on these keys, it is first determined whether there is data to be received. If it is determined that there is no data to be received and there is no data to be transmitted, it is returned to the main routine. After storing, the process proceeds to the step of determining whether there is data to be transmitted. If it is determined that there is data to be transmitted, it returns to the main routine after transmitting the data.

EXAMPLE

For example, the case in which the educator transmits and displays his / her screen to the third trainee and also transmits the screen will be described in the case where the input of the educator's keyboard 21 is continuously displayed to the trainee.

First, the educator presses the private key S ₁₃ in the education key group 452. The central processing unit 41 of the educator keeps kissing the keypad 45 in a polling manner, detects a key press, and determines whether the cancel key S ₃₃ or the execution key S ₃₄ is compared.

The binary data corresponding to this key is then transferred to the RAM in the central processing unit 41 and stored, and the central processing unit 41 is again scanning to receive the next data. At this time, if No. 3 is selected by Exhalation Increase Key (S ₃₁ ) or Exhalation Decrease Key (S ₃₂ ), it is detected and compared to Cancel Key (S ₃₃ ) or Execution Key (S ₃₄ ) and transmitted to RAM. Do a scan. Thus is pressed before educator presses the execution key (S ₃₄₎ cancel key (S ₃₃₎ or the execution key (S ₃₄₎ after comparing whether When confirming that the execution key (S ₃₄₎ pressing the execution key (S ₃₄₎ After interpreting the data transmitted to RAM, binary data is transmitted accordingly.

At this time, the central processing unit 41 of the controller 40 switches the first and second switching units 42 and 43 through the control signals C ₁ to C ₇ to execute the screen transmission mode. That is, the buffers K ₁ and K ₂ of the buffer units 421 to 425, 431 and 432 in the first and second switching units 42 and 43 are turned on, and the buffer K ₃ is turned on. Turn it off.

In addition, when the ID code of the third trainee is enabled to transmit data to the trainee (No. 3) and transmitted through the transmission bus (L ₁ ), the central processing unit (41s) of the trainee No. 3 interrupts polling. This will be detected. At this time, the controller 40 of the third trainee detects that the user is selected based on a signal input through the data transmission line D, and then, through the control signals C _1S to C _7S , the first and second switching units ( 42s) 43s. That is, among the buffer units 421s to 425s, 431s and 432s in the first and second switching units 42s and 43s, the buffers K _1S and K _2S are turned off and the buffers K _3S are turned off. Turn on

Therefore, the screen contents output from the educator computer system 100 are output from the computer system of the third trainee.

In this example, only the educator sends his screen to the third trainee and the educator's key data is displayed on the third trainee's screen. However, the relationship between the educator and the trainee is shown in Figs. It can be made between the educator and the specific trainee individual, the educator and the specific trainee group, the educator and the premeditated trainee according to the operation of the keypads 45 and 45s described in the above, wherein the selection of the specific person or group or the whole is made as described above. The subject is selected based on the signal transmitted from the data transmission line (D).

As described above, the present invention additionally connects a controller capable of transmitting screen contents to an existing computer system, and establishes a computer education system network by multiple accessing such computer systems, thereby allowing one educator to selectively display his or her own screen to multiple trainees. Can be sent to specific individuals, and educators can selectively train their screen contents by specific individuals or groups and check them. There is an advantage.

Claims (8)

In the educational computer network construction apparatus in which the input device 20 and the output device 30 are connected to the central processing unit 10, the input / output devices 20 and 30 are each the central processing unit via the controller 40. Is connected to (10), the input device 20 has its own central processing unit (10) according to the control signal of the central processing unit 41 in the controller 40, the key data signal output from the input device (20) Or the central processing unit 10 is connected to the controller 40s of the other person via the transmission bus L ₁ , and the output terminal of the central processing unit 10 is connected to the first switching unit 42. According to the control signal of the central processing unit 41 in the controller 40, the image output data output from the central processing unit 10 is controlled by another controller via its own output device 30 or the transmission bus L ₁ . The output device 30 is connected via the second switching unit 43 to be transmitted to 40s). Educational computer network construction apparatus that. According to claim 1, Computer system 100 for educators are connected to the computer system for trainees 200 ~ N by a central processing unit (10s), input and output devices (20s) (30s) and the controller (40s), Between the educator computer system 100 and the educator computer systems 200 to N, the first controller 42 and the second switch unit 43 of the educator controller 40 may include a controller 40s for the educator. Each first switching unit (42s) and the second switching unit (43s) is connected to each other in parallel, characterized in that the educational computer network construction apparatus. The method of claim 1 or claim 2, wherein the first and second switching unit 42, 43 is composed of a buffer unit (421 ~ 425) 431, 432, each of the buffer unit (421 ~ 425) (421) (432) is an educational computer network construction apparatus characterized in that the buffer (K ₁ ) is connected in parallel to both ends of the buffer (K ₂ ) (K ₃ ) connected in series. The input terminal of the buffer units 421 to 425 of the first switching unit 42 is perpendicular to the red, green, and blue signal (R, G, B) output terminals of the central processing unit 10. The output terminal of the input device 20 is connected to the output terminal of the synchronization signal V output terminal and the horizontal synchronization signal H output terminal, respectively, and the buffer units 431 and 432 of the second switching unit 43. Educational computer network construction apparatus characterized in that each connected. 4. The buffer unit 421 of claim 3, wherein the buffer units 421 to 425, 431, 432 of the first and second switching units 42 and 43 in the controller 40 of the educator computer system 100 have their buffers. To the connection points between the buffers K ₂ and K ₃ in the sections 421 to 425, 431 and 432 to the buffer sections 421s to 425s and 431s of the trainee computer system 200 to N. Educational computer network construction apparatus, characterized in that connected to the connection point between the buffer (K _2S ) (K _3S ). The computer system for an educator performs an initialization upon power-on to set an interrupt generation cycle, and then determines whether key data is input from the keypad 45, and if there is an input of key data, the LCD display 44 If it is determined that the input of the cancel key (S ₃₃ ) or the execution key (S ₃₄ ) is not displayed, and then it is determined that it has not been entered, the step of determining whether to input the next key data while storing the key data is performed. (S ₃₃ ) or when the execution key (S ₃₄ ) is determined that the input is determined whether the command formed by combining the key is correct, if the result is determined that the command is not correct as a result of deleting the key data again Determining whether key data is input, if it is determined that the command is correct, executes the command and then determines whether to input the key for the next command. Construction educational computer network, characterized in that step consisting of. The computer system for a trainee performs an initialization upon power-up to set an interrupt generation cycle, and then determines whether key data is input from the keypad 45s, and if there is an input of key data, the LCD display unit 44s. Displaying in the step, and then determining whether the command is correct, as a result, if it is determined that the command is not correct to perform the step of determining whether to input the key data again. Educational computer network construction method comprising the step of determining whether the key input for. 8. The method of claim 6 or 7, wherein in the step of determining whether the key data is input, generating an interrupt when an educator is called when there is no key data input, and then inputting an instruction transmitted from the trainee. Method for constructing an educational computer network, characterized in that to perform the step of determining whether the command is correct.