JPH06337749A - Keyboard coupling circuit - Google Patents

Abstract

PURPOSE:To use a computer body and a display device in common by connecting at least two keyboards to one computer by a coupler when plural computers are installed for education. CONSTITUTION:This keyboard coupling circuit is equipped with the CPU body 11, the display device which displays process information of the CPU body 11, and a 1st keyboard 14 which inputs and outputs serial data (RXD) to the CPU by operator's key input, an acceptance propriety signal (RDY) for the serial data from the computer body 11, and a retransfer signal (RTY) and an initialization signal (RST) for the serial data, and has a 2nd keyboard 13 having the same function with the 1st keyboard 14 and a coupler which selects and sends signals selectively to the 1st or 2nd keyboard 13 or 14 by the CPU body 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard connecting circuit, and more particularly, when operating a plurality of computers for educational purposes, a keyboard connecting circuit capable of sharing one CPU body by alternating operation of at least two keyboards. Regarding

[0002]

2. Description of the Related Art Conventionally, a computer of this kind and a keyboard are connected by a cable in a one-to-one relationship. Here, the exchange of signals between the computer and the keyboard is performed by sending serial data (RXD) from the keyboard to the CP.
Timing signal (RDY) indicating whether data can be taken from U and serial data re-transfer signal (RT
Y), the initialization signal (RST) was sent to the keyboard. Therefore, C out of multiple educational computers
Even when the PU and the display device are shared by at least two operators, it is necessary to alternately perform the above-mentioned signal exchange.
Sharing was virtually impossible.

[0003]

In this conventional connection system for a computer and a keyboard, two operators cannot use the CPU and the display device in common by using two keyboards. Therefore, there is a drawback that the keyboard must be moved in front of the CPU and the display device each time each worker inputs, or that the workers must move in front of the keyboard to input the keyboard.

[0004]

A keyboard coupling circuit of the present invention includes a CPU body, a display device for displaying processing information of the CPU body, and the CPU by key input by an operator.
Serial data (RXD) to and from the CPU, serial data transfer enable / disable signal (RDY), serial data retransfer signal (RTY), and initialization signal (R).
In a keyboard coupling circuit having a first keyboard for inputting and outputting an operation signal having ST), a second keyboard having the same function as the first keyboard, and the first or second CPU from the CPU. And a combiner for selectively transmitting the operation signal to any of the keyboards.

[0005]

The present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram of a keyboard coupling circuit according to an embodiment of the present invention. FIG. 2 is an external view of the entire computer when the coupler of the present invention is used. The keyboard combiner 1 shown in the embodiment of FIG. 1 includes an OR circuit 2 for selecting one of serial data (RXD) input from two keyboards, and an RDY signal transmitted from a computer (CPU) to the keyboard. , RTY signal, RST
A selection switch 3 for selecting and transmitting a signal to either the keyboard interface section 4 or 5, keyboard interface sections 4 and 5 which are interfaces provided with a buffer amplifier 6 and connected to each keyboard, and a keyboard interface section 5. A selection key 7 for controlling the selection switch 3 provided and a computer terminal 8 for connection to the CPU main body. In this operation, the selection key 7 of the keyboard interface unit 5 is pressed to select one of the two keyboards. When the selection switch 3 selects the keyboard interface section 5 shown in the figure, RDY, R
The TY and RST signals are transmitted to the selected keyboard,
The serial data by the key operation by the operator is input to the OR circuit 2 via the buffer amplifier 6. Although no data is input to the OR circuit 2 even if an attempt is made to input data from another keyboard, no data is input from the CPU, but an OR circuit is provided to prevent malfunction. Such a coupler 1 is connected to two keyboards 13 and 14 by a cable as shown in FIG.
Connect to the U body 11. The processing result of the CPU body 11 is displayed on the display device 12.

[0007]

As described above, according to the present invention, by providing the coupler, it is possible to connect two keyboards to one computer and input data from the selected keyboard. Therefore, in the educational computer, the beginner and the educator operate the respective keyboards one by one, so that there is an effect that the education can be conducted more efficiently.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is an external view of a computer device to which the present invention is applied.

[Explanation of symbols]

 1 Combiner 2 OR Circuit 3 Selection Switch 4, 5 Keyboard Interface Section 6 Buffer Amplifier 7 Selection Key 8 Computer Terminal 11 CPU Main Body 12 Display Device 13, 14 Keyboard

Claims (2)

[Claims] 1. A CPU main body, a display device for displaying processing information of the CPU main body, serial data (RXD) to the CPU by an operator's key input, and a serial data acceptability signal (RDY) from the CPU. ) And a first keyboard for inputting and outputting an operation signal having a serial data retransfer signal (RTY) and an initialization signal (RST), and a keyboard coupling circuit having the same function as the first keyboard. A keyboard coupling circuit comprising: a second keyboard; and a coupler for selecting and transmitting an operation signal from the CPU to either the first or the second keyboard. 2. The selection key for selecting the first or second keyboard by the coupler, and the R key controlled by the selection key.
2. The keyboard coupling circuit according to claim 1, further comprising a selection switch for supplying DY, RTY, and RST signals to any keyboard.