JPS61168071A - System for shared using personal computer, or the like - Google Patents

Abstract

PURPOSE:To jointly use a personal computer or word processor with a large number of people, by connecting plural slave devices, each of which is composed of a display and keyboard, with a host device equipped with a main body, in which keyboard controlling board, etc., are connected with a CPU main board. CONSTITUTION:Signals are sent from the keyboard controlling board 4 of a main body 1 to the decoder 16 and multiplexer 18 of a keyboard 10 and further supplied to a key matrix 17. When any one of the keyboards 10 provided in a host device (a) and slave devices (b) is depressed, a coincidence signal is changed and the keyboard controlling board 4 discriminates that which keyboard is depressed. Coincidence signals generated from each slave device and host device are returned to a control box 22 through the one-channel driver 28 in a branching box 23. When selection is made through a slave device change-over switch 27, optional keyboard input data of the host device (a) and slave devices (b) are transmitted to the main body 1 through an one-channel receiver 25.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shared use system for personal computers, etc., which can be applied to school classes, corporate communications, etc.

(Conventional technology) Group learning is the basis of school classes. For this reason, in conventional schools, teachers write on the blackboard and students read what they write while teaching lessons. On the other hand, in companies,
Transfer necessary information in documents to proceed with business,
I will recommend the work. If these tasks were to be carried out using a large number of personal computers or word processors in order to increase their effectiveness, a large amount of money and enormous equipment would be required.

(Problems to be Solved by the Invention) The present invention has been made in view of this point, and uses one base unit and multiple slave units to provide education in schools and exchange of information in companies. It was designed to be useful. The present invention significantly simplifies the handset and solves the problem of requiring a large amount of expense and large scale equipment.

(Means for solving the problems) As a means for solving the above problems, the present invention provides
U A master device such as a personal computer that has a main body with a display control board, keyboard control board, floppy disk control board, printer control board, etc. connected to the main board, and multiple child devices each consisting of a display and a keyboard. be.

(Function) With this configuration, a plurality of slave units can be operated using the circuit on the parent unit side, so the above object can be achieved with a simple circuit configuration and an inexpensive system.

(Example) Next, to explain the present invention in detail with reference to the drawings, FIG. CPU main board 2K, display control board (display control circuit) 3, keyboard control board (keyboard control circuit) 4, and 70 disk control board (7
0tsupi disk control circuit) 5, printer control board (
A printer control circuit) 6 is connected to the printer control circuit. A display 9 is connected to the display control board 6 via a display interface 8 of a display device 7. Further, the keyboard control board 4 has a keyboard 10, the 70 disk drive control board 5 has a floppy disk unit 11, and the printer control board 6
A printer 12 is connected to each.

FIG. 2 shows the main part of the present invention. In other words, the main body 1 has a display 9 and a keyboard 10 (shown at the bottom of the main body 1), as well as displays 9 and keyboards 10 for multiple slave units (represented by the cloth cut in the figure). are connected. FIG. 3 shows how the display 9 of the display device 7 is connected to the display control board 3 in FIG.

As shown in this figure, a video signal (V
D), horizontal synchronization signal (H8), and vertical synchronization signal (
VS) will be supplied. However, handling each signal individually in this way would require an extremely large number of wires, so
As shown in FIG. 4, these various signals are synthesized by a waveform synthesis circuit 13. The waveform shown on the right side of the waveform synthesis circuit 13 is a synthesized waveform. If you do as shown in Figure 4, you can connect multiple slave units to one base unit using a bridge connection.
Multiple handsets can be bridged together using coaxial cables.

What is indicated by the reference numeral 14 in FIG. 5 is the waveform synthesis circuit 1 described above.
5, each signal (VD, I(8, V8
), and is connected to the middle of the coaxial cable 15 that connects the waveform synthesis circuit 13 and the display device 7 (slave device). What is shown in FIG. 6 is an example of the configuration around the keyboard 10. In this figure, 16 is a decoder, 17-digit key matrix, and 18 is a multiplexer. The key socket 19 of the main body 1 to which the keyboard control board 3 is connected has a connector 20 to be described later.
The decoder 16 of the keyboard 10 and the multiplexer 18 are connected by the decoder 16 of the keyboard 10 . Signals flow between the keyboard control board 3 and the decoder 16 only in the direction shown by the arrow in the figure, but a coincidence signal is returned from the multiplexer 18 to the keyboard control board 5.

FIG. 7 is an overall circuit diagram combining the above-mentioned parts. To explain this, 20 is a connector, key socket 19
Combined with? A core coaxial cable 21 sends signals from the keyboard control board 4 to a branch box 23@ via a control box 22. The control box 22 is provided with a line driver 24 and a 1-channel line receiver 25. The output of the line driver 24 is sent to the channel line receiver 26, and the output of the 1-channel line receiver 25 is connected to the slave device changeover switch 27. The signal from the channel line receiver 25 is applied to the trap. 29 is a multicore cable.

Explain the following nine effects. For convenience, 0 in FIG. 7 is the parent device, and ■ is the slave device. The number of slave units is not limited to two, but can be many. Signals are sent from the keyboard control board 4 of the main body 1 to the decoder 16 and multiplexer 18 of the keyboard 10, and are supplied to the key matrix 17. Numerous keyboards 10 each provided on the main unit ■ and slave unit ■
When any one of the keys is pressed, the matching signal changes, so the keyboard control board 4 that receives this signal identifies which key was pressed.

Generally, the main body 1 and the keyboard 10 of a personal computer are connected to a connector 20 on the keyboard 10 side and a keyboard 1 on the main body 1 side.
9, but since it is at TTL level as it is, it cannot be extended. Therefore, as a signal source from the keyboard control board 4 shown in FIG. 6 to the keyboard 10, it is sent via the multi-channel line driver 24 in the control box 22 shown in FIG. The cable is extended by receiving the signal at the receiver 26 and connecting it to the keyboard 10 of each parent device or child device.

A coincidence signal 30 (see FIG. 6) is generated from each child device (2) and the parent device, and is sent back to the control box 21C via the 1-channel line driver 28 in the branch box 23.

Therefore, by selecting the slave unit changeover switch 27 in the control box 22, arbitrary keyboard input data from the master unit (2) and slave unit (2) is supplied to the main unit 1 via the 1-channel line receiver 25. As described above, by using the circuit of FIG. 5 and the circuit of FIG. 7 in combination, a plurality of display devices and keyboards can be connected, and use by a large number of people becomes possible.

(Effects of the Invention) With the nine configurations described above, the present invention allows a large number of people to use computers and word processors together, so that students with low vision and passive students can enjoy the same conditions as other students at school. This will allow students to take classes, and in companies, it will be beneficial if multiple offices can quickly obtain or exchange the same information. Furthermore, since the device and circuit can be simplified, it can be implemented at low cost.

[Brief explanation of drawings]

Figures 1, 2, 5, and 6 are schematic diagrams of each part of the present invention, Figures 3 and 4 are explanatory diagrams showing signal waveforms, and Figure 7 is an overall circuit diagram. It is. 1... Main body 2... OPU main board 3.
・・Display control board 4・Keyboard control board 5・70 disc control board 6・Printer control board

Claims (1)

[Claims] (1) Connect multiple slave devices each consisting of a display and keyboard to a parent device such as a personal computer, which has a main body with a CPU main board connected to a display control board, keyboard control board, floppy disk control board, printer control board, etc. A shared use system for computers, etc., characterized by the following: