JPH0324694B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a console device having a configuration in which one console typewriter is shared by a plurality of central processing units.

[Technical background of the invention]

Traditionally, when using one console typewriter with multiple CPUs,
The console typewriter was connected to the console typewriter via a bus switching device, and a switching command was issued to the bus switching device using software, and the console typewriter and a specific CPU were connected and used.

[Problems with background technology]

However, in the above configuration, the switching command to connect a specific CPU to a console typewriter is
There is a drawback that the configuration of the software for outputting to the bus switching device is complicated. Also, CPUs of other systems other than the own system
When a console typewriter was used, buffer memory was required to hold the data, which had the disadvantage of reducing system efficiency. Note that the console typewriter referred to herein means a normal input/output typewriter having an input/output function, a CRT display with a keyboard, etc.

[Purpose of the invention]

You can use multiple devices without the need for complicated software.
An object of the present invention is to provide a console device that allows a single console typewriter to be shared by a CPU.

[Summary of the invention]

In a computer device configured to use one console typewriter with multiple central processing units (CPUs), a specific one of the multiple CPUs and the console typewriter are connected one-to-one, The above object is achieved by providing a switching device having a function of connecting a CPU other than the CPU connected to the console typewriter to the printer.

[Embodiments of the invention]

An embodiment of the computer device of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of a computer device of the present invention. Multiple CPUs (Central Processing Units) 1
is connected to the console 4 (CRT with keyboard) via each interface 2 and further via the switching device 3.
and printer 5. The switching device 3 includes a switching circuit 6 to which signal lines from a plurality of interfaces 2 are connected, a switching switch 7 with a CPU selection function that connects and disconnects the switching circuit 6, and a switching circuit 7 that connects and disconnects the switching circuit 6, and a switching circuit 6 that connects and disconnects the switching circuit 6. It has the function of organizing the data into text or line units and sending it to the printer 5, and when there is a conflict of data to the printer 5, a specific
The printer control unit 8 has a function of permitting each CPU 1 to use the printer 5 without depending on the CPU. Note that this printer control unit 8
has a built-in memory section 9.

Next, the operation of this embodiment will be explained. When data is output from a plurality of CPUs 1, the data of the CPU 1 that is output first is printed to the printer 5, regardless of the designation of the CPU selection switch 7. At this time, if a data output request comes from another CPU 1, the switching device 3 issues an output request.
Returns the busy BUSY signal to CPU1. however,
When the switching device 3 has some data buffer, it returns a busy BUSY signal after this data buffer becomes full. After printing the data of the CPU 1 for which an output request was first made, the switching device 3 searches the switching circuit 6 to see if there is a request for output data, and if there is an output request, the data is sent via the printer control unit 8. Printer 5 prints.
At this time, the print control unit 8 adds a header (CPU identification symbol) to the output data to indicate which CPU 1 has printed the data. For example, this header must be at the beginning of the data.
There are methods such as adding a CPU identification number.

Next, when data input/output is to be performed exclusively between a specific CPU 1 and the console (CRT with keyboard) 4, first select the specific CPU 1 using the output of the CPU selection switch 7. ,
This specific CPU 1 and console 4 are electrically connected one-to-one by a switching circuit 6. Even in this case, the other CPUs 1 and the printer 5 are connected by the switching circuit 6, and when there is an output request among these CPUs 1, the output is output under the control of the printer control unit 8 as usual. Print the output request data. In other words, if there are N CPU1s now,
Specific CPU 1 and data input/output to console 4
Even if it is done exclusively using
The CPU can output to the printer 5.
Furthermore, when inputting data by connecting a specific CPU to the console 4, select the CPU 1 specified by the CPU selection switch 7 as described above.
Since the data is sent only to the header, the above-mentioned processing such as adding a header is not necessary. In this figure, a CRT display with a keyboard is illustrated as the console 4, but a hard copy may be connected to this, or an input/output typewriter may be connected instead of this device.

〔Effect of the invention〕

According to this embodiment, since the connection between a specific CPU and the console is performed by a switch with a CPU selection function of a switching device and a switching circuit, it is possible to
1 CPU to 1 Console The console can be shared by multiple CPUs without making any changes or complication to the software used in typewriters. Therefore, compared to the conventional 1 CPU to 1 console typewriter, the installation space can be reduced and the device can be made cheaper.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of a computer device of the present invention. 1...CPU, 2...Interface, 3...
Switching device, 4...Console (with keyboard)
CRT), 5...Printer, 6...Switching circuit, 7...
...Selector switch with CPU selection function, 8...Printer control unit.

Claims (1)

[Claims] 1. In a computer system comprising a plurality of central processing units, one console shared by these central processing units, and a printer that prints output data of the plurality of central processing units, A selector switch with a CPU selection function that issues a connection command by specifying any one of the central processing units of the CPU selector, and a central processing unit specified based on the command of the selector switch with a CPU selection function and the above-mentioned central processing unit. A switching device is provided, comprising a switching circuit that connects the console to the console and connects all other central processing units other than the designated central processing unit to the printer according to priority, and the switching device A console device, characterized in that the plurality of central processing units are connected to one console and a printer via a device.