JPS5850035A - Keyboard controller - Google Patents

Abstract

PURPOSE:To use a keyboard for a master processing device as well as a slave processing device, by interrupting master and slave processing devices when first and second specific character codes are detected by a keyboard controller respectively and executing the processing in these processing devices in accordance with the depression of corresponding specific character keys on the keyboard. CONSTITUTION:A data and control line 7 connected to a keyboard is connected to an input/output interface circuit 8 for the keyboard of a keyboard controller 3, and data and control lines 5 and 6 connected to master and slave processing devices are connected to interface circuits 9 and 10 for processing devices. Character codes for master and slave processing devices are set to slide switches 18 and 19 of the controller 3 respectively and are compared with first and second specific character codes, which are inputted from the keyboard, in comparing circuits 13 and 14. When the first specific code is detected by the circuit 13, the circuit 9 is interrupted by the output of an interrupt signal generating circuit 17; and when the second specific character code is detected by the circuit 14, the circuit 10 is interrupted, and thus, the processing is executed in the corresponding master or slave processing device.

Description

[Detailed description of the invention] The present invention relates to a keyboard control device.

Conventionally, in keyboard control devices such as typewriter control devices that are duplicated and connected to both main and slave processing devices, interrupts from the keyboard to the processing device when using the keyboard can be performed using special keys on the keyboard or specific characters. The press of a key usually interrupts only the main processing unit, or only the device that last accessed the keyboard.

In the former case, the key can be used without any inconvenience in the main processing unit, but in the secondary processing unit, the keyboard cannot be used, and in the latter case, the operator cannot arbitrarily interrupt the processing unit intended by the operator. Therefore, it usually had the disadvantage that it was necessary to specify the system to be used.

An object of the present invention is to set the keymate control device using a key or jumper and a circuit that interrupts the main processing unit when a first specific character code is detected. By providing a circuit that interrupts the secondary processing unit when a second specific character code is detected, when two specific character keys on the keyboard are pressed (when one key is pressed, the main processing unit is interrupted, and the other key It is an object of the present invention to provide a keyboard control device that can interrupt either processing device (when pressed, interrupts the subordinate processing device) and can use a keymate with one processing device.

The keyboard control device of the present invention is a system in which duplex processing devices are in a master or slave relationship, and the keyboard control device is connected to both of the processing devices to control the keyboard. A circuit that sends an interrupt signal to the main processing device when it detects a first specific character code that can be set with a jumper or switch among the character codes sent from the keyboard, and a jumper among the character codes sent from the keyboard. or a circuit that sends an interrupt signal to the secondary processing device when a second specific character code that can be set by a switch is detected, and an operation mode (synchronous operation or asynchronous operation) of the duplicated processing device. has a detection circuit, and when the duplexed processing devices are in asynchronous operation, when the character code sent from the keyboard matches the first character code, the main processing device among the duplexed processing devices; When the character code sent from the keyboard matches the second character code, an interrupt signal is sent to a secondary processing device among the duplexed processing devices, and when the duplexed processing devices are in synchronous operation, the interrupt signal is sent from the keyboard. When the character code to be processed is the first character code or the second character code, it is possible to use the keyboard with the image processing device without inconvenience by sending an interrupt signal to both of the duplex processing devices. It is characterized by the following.

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a diagram showing an example of an information processing system to which the present invention is directed, in which a keyboard control device 3 is connected to a processing device 1 and a processing device 2. As shown in FIG. 4 is the keyboard, 5.6
7#i are data and control lines connecting the processing devices 1 and 2 and the keyboard control device 3, and 7#i are data and control lines connecting the keyboard control device 3 and the keyboard 4.

FIG. 2 is a diagram of a keyboard control device showing an embodiment of the present invention. In this figure, the general character printing/reading functions of the keyboard control device are referred to as pla, kubo, and kubo, and the explanation of To5 is omitted.

8 is a key-to-key input/output interface circuit.

9. 10 is a processing device interface circuit, 11 is a keyboard controller control circuit, 12 is a monitor/buffer circuit sent from the keymate, 13
．． 14 is a comparison circuit, 15.16 is an interrupt signal generation circuit, 1
7 is an interrupt signal selection circuit, 18.19 is a slide switch, and 20.21 is an interrupt signal.

Further, the data control line 5 connecting the processing device 1 and the keyboard control device 3 is an interrupt signal line sb, and an operation mode line 5c of the processing device l.
, mode ascs indicating master/slave of the processing device 1, and other data control lines 5m. Similarly, the data control line 6 connecting the processing device 2 and the keyboard control device 3 is an interrupt signal line 6b, an operation mode line 6c of the processing device 2, a mode 116d indicating master/slave of the processing device 2, and other data control lines. It consists of 66m.

For the sake of explanation, please set slide switch 18 to "1011110"
It is assumed that the 0' pattern (A8ell code of character 1) is set and the slide switch 19K"10100100' pattern (A3C11:f-code of character Ill) is set. 1<1 code is pressed on the keyboard. In this case, the pattern "10111100" is set in the read buffer circuit 12 through the key input/output interface circuit 8.The comparison circuit 13 compares the contents of the slide switch 18, the input/output interface circuit 8, and the input/output interface circuit 8.
If they match, the interrupt signal generation circuit 15 is activated and the interrupt signal 20 is supplied to the interrupt signal selection circuit 17.

If the l1Il@ code is pressed on the keyboard, the 'tootootoo' pattern is set in the read buffer circuit 12 through the keyboard input/output interface circuit 8. Slide with comparison circuit 14.

The contents of the switch 19 and the read buffer circuit 12 are compared, and if they match, the interrupt signal generation circuit 16 is activated and the interrupt signal 21 is supplied to the interrupt signal selection circuit 17.

Here, the operation of the interrupt signal selection circuit 17 will be explained in detail using FIG. 100°101.10 in Figure 3
2Fi OR circuit% 103 to 108 are AND circuits.

109 to 111 are inverter circuits.

Now, assuming that the processing device 1 is in the main mode, the processing device 2 is in the slave mode, and the processing devices 1 and 2 are operating asynchronously, the operation mode @5c, 6ctj: "O", master/slave mote! Is dha "1' , 64Fi"O" TonazteInle. When a character 1<1 is pressed on the keyboard, an interrupt signal is supplied to the interrupt signal selection circuit 17 through the AND circuit 104. The OR circuit 101 is sent to the processing device 1 through the interrupt signal line 5b, and the key 4 can be used in the processing device 1.

Similarly, when 11 characters from the 1st key are pressed, the interrupt signal 21 is supplied to the interrupt signal selection circuit 17, and the 5% return signal is output to the AND circuit 106. The OR circuit 1029 is sent to the processing device 2 through the return signal line 6b, and the keyboard 4 can be used in the processing device 2.

When the processing device 2 is in the main mode and the processing device 1 is in the slave mode, the operation is similar to that described above, so a description thereof will be omitted.

Next, assuming that processing units 1 and 2 are operating synchronously, the operating modes @5i and 6c will be '1', and in this case, whether the interrupt signal is supplied from either 20 or 21, the OR circuit 1
00. AND circuit 105s OR circuit 101, 102. The interrupt signal lines 5b, 6b are sent to both the processors 1 and 2, and the processors 1 and 2 are synchronously connected to the keyboard 4.
can be used.

As explained above, in the keyboard control device connected to each of the redundant processing devices operating in the master or slave mode, when the processing device detects a specific character code during asynchronous operation, interrupts the main processing unit,
If other specific character codes are detected, an interrupt is sent to the slave processing unit.

Furthermore, when the processing units are in synchronous operation, if any of the specific character codes is detected, both of the processing units are interrupted.In asynchronous operation, the main and slave processing units can share the keyboard without any restrictions. can do.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an information system targeted by the present invention, and FIG. 2 is a block diagram showing an example of an information system of the present invention.
FIG. 3 is a circuit diagram showing one embodiment of the interrupt signal selection circuit used in the present invention. 1.2... Processing device, 3... Keyboard control device, 4... Keyboard, 5.6.7.
...Data, control line, 8...Keyboard input/output interface 7 ace circuit, 5a, 6t...
Other data control lines, 5b. 6b...Interrupt signal line, 5c, 6c...
Driving mode II. 5d, @d...Main/slave mode line, 9.10...
...Processing device input/output interface 7 ace circuit, 11
...Control circuit of keyboard control device, 12...
... Lead bar. 7A circuit, 13.14... Comparison circuit, 15.1
6... Interrupt signal generation circuit %17... Interrupt signal selection circuit. 18.19...Slide switch, 20.21
......Interrupt signal, 100-102...OR circuit, 103-108...AND circuit, 10
9-111...--Inverter circuit. 2 1st flash

Claims (1)

[Claims] In an information processing system in which the processing devices are duplicated, one of which operates in a primary mode and the other operates in a slave mode, and a keyboard control device is connected to both of the duplicated processing devices, the keyboard control device is connected to the keyboard. Characters to be sent: A first interrupt signal generation circuit that generates an interrupt signal when it detects the first specific character code that can be set with a jumper or switch among the characters; a second interrupt signal generation circuit that generates an interrupt signal when a second specific character code that can be set with a switch is detected; and an output of the first interrupt signal generation circuit when the first specific character code is received; A circuit that sends the output of the second interrupt signal generation circuit to the main mode processing device of the duplexed processing devices, and a circuit that sends the output of the second interrupt signal generation circuit to the secondary mode processing device of the duplexed processing devices when the second specific character code is received. a circuit for sending the output to the processing device of the mode, and duplicating the output of the first interrupt signal generation circuit or the second interrupt signal generation circuit when receiving the first specific character code or the second specific character code; and an operation mode detection circuit for detecting whether the duplexed processing equipment is in synchronous operation or asynchronous operation, and the duplexed processing equipment is in asynchronous operation. When the second specific character code is sent from the keyboard, the main processing unit of the duplexed processing units is interrupted at 9 o'clock, and when the second specific character code is sent from the keyboard, the duplexed An interrupt is sent to the subordinate processing device among the processing devices, and when the duplicated processing devices are in synchronous operation, either the 1F) 4I fixed character code or the second specific character code is sent from the keyboard! 9. A keyboard control device that interrupts both of the duplex processing devices in the case of nine cases.