JPS60181825A - Data processing system - Google Patents

Abstract

PURPOSE:To attain a data processing system capable of reset with a simple operation where a power supply of the disk side is applied again even though an error is produced due to the break of a power supply at the side of a disk device during the system working. CONSTITUTION:If the power supply of a disk device 5 is turned off during the system working, an access permission flag is reset to display a disk breakdown error to a CRT display device 2. Under such conditions, the power supply of the device 5 is turned on. Then a CPU6 of a controller main body 1 reads a volume catalog and a file catalog out of a disk of the device 5 and sets an access permission flag and a catalog read decision flag respectively. In such a way, the data processing system is reset to a state obtained before the power supply of the device 5 is turned off. Therefore the data processed before the power supply is turned off are used as they are to process the subsequent data. In this respect, it is so far needed to start the system again and therefore the data processed before the power supply is turned off are cancelled and wasted. Thus the system can be simply reset just by applying the power supply again even though the power supply of the disk is turned off.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a data processing system to which a disk device is connected.

"Technical background of the invention and its problems" Conventionally, in a data processing system connected to a disk device, if the power to the disk device is cut off while the system is running, the control device enters an error state and becomes inoperable. There was a problem in that the system did not return to its original state even if the power to the disk device was restored in this state, and the entire system had to be restarted.

[Purpose of the Invention] This invention was made to solve such problems, and it is possible to restart the power to the disk even if the power to the disk device is cut off during system operation and an error state occurs. It is an object of the present invention to provide a data processing system that can restore the system with a simple operation of just inputting data.

[Summary of the Invention] The present invention provides a data processing system that connects a disk device to a control device main body, reads predetermined data from the disk of this disk device, runs a program in the control device main body, and performs required data processing. The control device main body includes means for detecting a power state of the disk device, and the detecting means detects a change in power from an ON to an OFF state.
When a change to the N state is detected and the predetermined data is further read from the disk of the disk device, an access permission flag is set to Sera 1, and when the detection means detects a change in the power from the ON state to the OFF state. The apparatus is provided with means for performing disk down error processing, and means for reading the predetermined data from the disk of the disk device when the detecting means detects a change in power from OFF to ON.

[Embodiments of the invention] Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 is a control device main body, and this control device main body 1 includes a CRT display 2, a keyboard 3, and a dot printer 4.
, a disk device 5 is connected.

The control device main body 1 includes a CPIJ (central processing unit) 6, R
OM (read only memory) 7, RAM (random access memory) 8, CRI-interface 9, keyboard interface 101, printer interface 11, and disk interface 12 are provided, and the CPU 6, the ROM 7, the RAM 8, Each interface 9.10111.12 is connected via a pass line and control 1 to roll lines. Said C
The CRT display 2 is connected to the RT interface 9, the keyboard 3 is connected to the keyboard interface 10, and the printer interface 11
The dot printer 4 is connected to the dot printer 4, and the disk device 5 is connected to the disk interface 12. As shown in FIG. 2, the RAM 8 includes an access permission flag F1, which is set when predetermined data is read from the disk of the disk device 5, and is used to determine whether access to the disk is permitted; Determine whether the volume catalog and file catalog, which are predetermined data, have been read from [! Catalog reading judgment flag F for 7i
2. A disk error counter DEC that counts the number of disk errors; a volume sector area VSA that stores the start left and end sectors of each volume from the disk; and a character generator area CGA that stores each second character code. , the above C
A CRT area CA for storing display data on the RT display 2 is also formed.

The CPU 6 processes each section according to the program data in the ROM 7, and in particular, the CPU 6 processes the programs shown in FIGS. 3 and 4. That is, FIG. 3 shows the main processing routine, and when the star 1- is applied, first it is checked whether the power of the disk device 5 is turned on. At this time, if the power is on, the access permission flag F1 is set, and if the power is off, the access permission flag F2 is reset to 1.about. Next, the disk error counter DEC is cleared. Disk checks are periodically performed unless the entire system is turned off. As shown in FIG. 4, this disk check first checks whether the power of the disk device 5 is turned on, and if it is turned on, then whether or not the access C1 enable flag F1 is set. is checked, and if it is set, the routine passes the check of the contents of the disk error counter DEC. In addition, if the reset 1~ has been performed, then the catalog read judgment flag F2 is checked and the flag F
If 2 is set to 1-, the access permission flag F1 is set and the routine is executed by the disk error counter DEC.
Pass the content check.

If the catalog read judgment flag F2 is reset, the control device main body 1 is read from the disk of the disk device 5.
A volume catalog and a file catalog, which are predetermined data for running the program, are read. So, next are the stars 1 to t for each volume? Check whether the sector and end sector have been read into the volume left area VSA, and if they are read/υ, set the access permission flag F1 and catalog read judgment flag F2, respectively, and read them. The disk error counter DEC is incremented by 1 and the error display is cleared. The routine then moves to checking the contents of the disk error counter DEC.

In addition, in the power check of the disk device 5, when the power is OFF or F, first it is checked whether the access permission flag F1 is set, and if it is set, the access permission flag F1 is reset. At the same time, an error message indicating that the disk is down is displayed, and the routine shifts to checking the contents of the disk error counter DEC. Further, when the access permission flag F1 is reset to 1-, the routine immediately shifts to checking the contents of the disk error counter DEC.

When checking the contents of the disk error counter DEC, if the contents exceed 10, the own task is stopped. After that, a waiting time of approximately 100 m5ec will be set ()
, I'm trying to run other tasks in the meantime.

With such a configuration, for example, when the power of the disk device 5 is turned off while the system is operating, the access permission flag F1 is reset and a disk down error is displayed on the CR1 display 2.

Also, at this time, a buzzer or the like may be turned off. When the power of the disk device 5 is turned back on in this state, the CPU 6 of the control device main body 1 reads the volume catalog and file log from the disk of the disk device 5, and sets the access permission flag F1 and the catalog read judgment flag F2. do. In this way, the system is returned to the state before the power of the disk device 5 was turned off. Therefore, the data that was being processed before the power was turned off is used as is for subsequent data processing. In this regard, conventionally, the system had to be restarted, and data processed before the power was turned off would be canceled and wasted. In this way, even if the power to the disk is turned off, the system can be restored by simply turning the power back on.

In addition, in this device, reading the volume catalog from the disk device 5 runs the disk check routine once.
If the task is not executed even after 0 passes, the task can be stopped as an error has occurred.

[Effects of the Invention] As detailed above, according to the present invention, even if the power to the disk device side is turned off during system operation and an error state occurs, the system can be easily operated by simply turning on the power to the disk side again. A data processing system capable of system recovery can be provided.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; FIG. 1 is a block diagram, FIG. 2 is a diagram showing the main memory configuration of RAM, FIG. 3 is a flowchart showing the main processing of C and P Ll, and FIG. The figure is a flowchart showing disk check processing in the main processing. 1... Control device main body, 5... Disk device, 6...
・CPtJ (Central Processing Unit @), 7... ROM (Read Only Memory), 8... RAM (Random
access memory), Fl...access permission flag,
F2: Catalog reading judgment flag. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] A disk device is connected to the main body of the control device, and predetermined data is read from the T/R screen of this disk device to control the control unit 2.
11 In a data processing system that operates a program in the equipment itself and performs necessary data processing, the above system 17II is used.
The device body includes means for detecting the power state of the disk device, and this detecting means resets when detecting a change in the power state from 0 to 1, and detects a change from OFF to ON. An access permission flag is set when the predetermined data is read from the disk of the disk device after the detection, and when the detecting means detects a change in power from an ON state to an OFF state, a disk down error process is performed. and means for reading the predetermined data from a disk of the disk device when the detection means detects a change in power from OFF to ON.