JPS61201355A - Prevention system for destruction of terminal resource - Google Patents

Abstract

PURPOSE:To prevent a terminal resource from destruction by protecting a device intrinsic information storage mechanism when device intrinsic information is set up. CONSTITUTION:When the information is set up on off-line basis by an operator's indication, a terminal 3 places a form overlay storage mechanism 6 in a protected state (wherein download operation from a host computer 1 is inhibited). When the host computer 1 loads a form overlay pattern down, the terminal 3 returns an error to the host computer 1. When the contents of the form overlay storage mechanism 6 are backed up (saved) in a floppy disk device 9 by an operator's indication on the terminal 3, the form overlay storage mechanism 6 is released from being protected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a terminal resource destruction prevention method that prevents destruction of device-specific information stored in a device-specific information storage mechanism of a terminal.

〔overview〕

In a network system configured such that data in the external storage device of the terminal can be stored in the device-specific information storage mechanism of the terminal, and data from the host computer can also be stored in the storage mechanism, When data is stored in the storage device, data from the host computer cannot be stored in the storage mechanism.

[Prior art and problems]

Terminals have also come to have their own resources (herein referred to as device resource specific information). This device-specific information is stored in the accommodation mechanism, but the device-specific information of the accommodation mechanism can be set or updated by instructions from the terminal operator, or can be uploaded by downloading from the host computer. You can also do it. Therefore, unless the operator of the terminal and the operator of the host computer work together to increase the amount of device-specific information, the terminal resources may be destroyed.

[Purpose of the invention]

The present invention is based on the above considerations and aims to provide a terminal resource destruction prevention method that can prevent the destruction of terminal resources.

[Means to achieve the purpose]

Therefore, the terminal resource destruction prevention method of the present invention includes a host computer and a terminal connected to the host computer and having a device-specific information storage mechanism,
The device-specific information storage mechanism can store device-specific information offline according to instructions from the operator on the terminal side, and can also store device-specific information from the host computer by downloading instructions from the host computer. A method for preventing destruction of terminal resources in a network system configured to be able to send data to the terminal, wherein the terminal sends up device-specific information to the device-specific information storage mechanism according to instructions from an operator on the terminal side. Sometimes, the device-specific information storage mechanism is set to a protected state, and if a download instruction is received from the host computer in the protected state, no writing is performed to the device-specific information storage mechanism, and an error message is sent to the host computer. It is characterized by being configured to notify the following.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to the drawings. FIG. 1 is a diagram illustrating an embodiment of the present invention, FIG. 2 is a diagram illustrating an example of a network system to which the present invention is applied, and FIG. 3 is a diagram illustrating a device-specific information storage mechanism. .

In FIG. 2, 1 is a host computer, 2 is a terminal control device, and 3 is a terminal.

The host computer 1 and the terminal control device 2 are connected through a communication line. The application program of the host computer 1 does not recognize the terminal control device 2 as a node. A terminal like the one shown in FIG. 2 is called a cluster type terminal. Each of the terminals 3 in the cluster configuration is independently connected to an application program.

FIG. 3 explains the device-specific resource accommodation mechanism.

In FIG. 3, reference numeral 4 indicates a mini magnetic disk device, 5 a key file storage mechanism, 6 a form overlay storage mechanism, 7 a format store storage mechanism, and 8 and 9 floppy disk devices, respectively. The terminal 3 in FIG. 2 has a mini magnetic disk drive 4 and floppy disk drives 8 and 9. The mini magnetic disk is divided into a program storage area, a key file storage area, a form overlay storage area, and a format store storage area. The key file storage area is called a key file storage mechanism, the form overlay storage area is called a form overlay storage mechanism, and the format store storage area is called a formant store storage mechanism. For example, the key file storage mechanism 5 is divided into 63 partitions, the form overlay storage mechanism 6 is divided into 255 partitions,
The format store storage mechanism 7 is divided into 512 sections. One pattern is stored in each section. For example, each section of the form overlay storage mechanism 6 stores one form overlay pattern.

Note that it goes without saying that a directory exists for managing pattern data. The floppy disk device 8 stores a plurality of key file patterns, a plurality of form overlay patterns, and a plurality of format store patterns.

Follow the instructions from the operator at the terminal to
The form overlay pattern in the disk drive 8 can be written into the form overlay storage mechanism 6. Further, the form overlay pattern from the host computer 1 can also be stored in the form overlay storage mechanism 6. When the host computer 1 wants to store pattern data in the form overlay storage mechanism 6, it sends a WRIT command to the terminal 3, and then stores the pattern data to which the form overlay pattern name is added.
Send data to terminal 3. Terminal 3 then writes the pattern data into the corresponding compartment of form overlay storage mechanism 6. Furthermore, the host computer 1 can clear the pattern data in the form overlay accommodation mechanism 6 by sending a clear command to the terminal 3. Pattern data can also be inserted into the key file storage mechanism 5 and format store storage mechanism 7 according to instructions from the operator on the terminal side, and pattern data can also be stored in these storage mechanisms under the control of the host computer 1. Of course, it is possible to write data or clear pattern data in these storage mechanisms. The floppy disk device 9 is used as an external storage device for saving pattern data in the storage mechanism 5.6.7.

By the way, when the host calculation a1 instructs writing or clearing of the form overlay pattern in a state in which pattern data has been written to the form overlay accommodation mechanism 6 according to an instruction from the operator on the terminal side, it is assumed that the form overlay pattern is written in the same section. If this is the case, the form overlay pattern written by the operator at the terminal will be destroyed. In order to prevent such destruction of pattern data, a protect flag is provided for each partition, and when pattern data is written according to an instruction from the terminal side, the terminal 3 sets the corresponding protect flag to rlJ. Make it. and,
When pattern data is sent from the host computer 1, if the protect flag of the partition to which the pattern data is to be written is "1", no data is written to the storage mechanisms 5, 6.7. , reports the error to the host computer 1. When clearing is instructed by host computer 1, terminal 3 checks whether the protect flag of the corresponding partition is "1" or rOJ, and if it is "1", does not clear and reports an error to host computer 1. . When the pattern data of the storage mechanisms 5, 6.7 is saved to the floppy disk device 9, the protect flag of the partition where the saved data was stored is set to "0".

Instead of providing a protect flag for each compartment, one protect flag could be provided for each containment mechanism.

FIG. 1 is a diagram illustrating one embodiment of the present invention.

In FIG. 1, reference numeral 10 indicates a magnetic disk device for storing pattern data that the host computer 1 has.

Although the form overlay accommodation mechanism 6 will be described below as an example, the same can be said of the other accommodation mechanisms 5.7. When offline setup is performed according to instructions from the operator of the terminal 3, the terminal 3 puts the form overlay storage mechanism 6 in a protected state (downloading from the host computer 1 is prohibited). When the host H[4ffll attempts to download the form overlay pattern, the terminal 3 returns an error to the host computer 1. When the contents of the form overlay storage mechanism 6 are backed up (saved) to the floppy disk drive 9 in response to an instruction from the operator of the terminal 3, the protected state of the form overlay storage mechanism 6 is released.

When the protection is canceled, host computer 1
When the user instructs to load a form overlay pattern, the form overlay pattern is stored in the form overlay storage mechanism 6. The pattern data stored in the floppy disk drive 9 can be restored to the form overlay storage mechanism 6 at any time.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, erroneous downloads from the host computer can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram illustrating an embodiment of the present invention, FIG. 2 is a diagram illustrating an example of a network system to which the present invention is applied, and FIG. 3 is a diagram illustrating an information storage mechanism of a device. be. 1...Host computer, 2...Terminal control device, 3...
・Terminal, 4...Mini magnetic disk device, 5...
・Key file capacity trR16...Form・
Overlay storage mechanism, 7... Format store storage mechanism, 8 and 9... Floppy disk device, 10
...A magnetic disk device for storing pattern data that the host computer 1 has.

Claims (1)

[Claims] It is equipped with a host computer and a terminal connected to the host computer and having a device-specific information storage mechanism, and device-specific information can be set up offline in the device-specific information storage mechanism according to instructions from an operator on the terminal side. Also, a method for preventing destruction of terminal resources in a network system configured such that device-specific information from the host computer can be set up in the device-specific information storage mechanism in accordance with a download/load instruction from the host computer, When the terminal sets up the device-specific information in the device-specific information storage mechanism according to instructions from the operator on the terminal side, the terminal puts the device-specific information storage mechanism in the protected state, and in the protected state receives download instructions from the host computer. A method for preventing destruction of terminal resources, characterized in that when a terminal resource is received, writing is not performed to the device-specific information storage mechanism, and an error is notified to the host computer.