JPS6218071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device that has an automatic IPL function and further loads a control program from a cassette magnetic tape device. This invention relates to a cassette magnetic tape device diagnostic circuit that can detect

(2) Prior Art and Problems A control program for an information processing device is stored in a cassette magnetic tape device as another auxiliary storage device, and the control program is loaded from the cassette magnetic tape device according to instructions from the information processing device. When a major failure such as a system failure occurs in a device that executes program processing, the conventional information processing device satisfies the initial program load (IPL) conditions and repeats the IPL continuously (several times). However, if the cause of the failure is a mixture of file abnormalities, hardware failures of the cassette magnetic tape device, etc., no matter how many times the IPL is repeated, it becomes useless.

(3) Purpose of the Invention In view of the above-mentioned conventional drawbacks, the present invention enables early detection of system failures by periodically diagnosing the loading function, which operates only when automatic IPL conditions are met due to a system failure. The object of the present invention is to provide a diagnostic circuit for a cassette magnetic tape device.

(4) Structure of the Invention The present invention provides an information processing system in which a control program stored on a cassette magnetic tape is loaded from a cassette magnetic tape device to a main control section and program processing is executed. a signal switching means for drawing the data bus and control signals of the cassette magnetic tape device to the diagnostic circuit side; a test data storage section for storing test data for confirming the normality of data read from the cassette magnetic tape device; and the test data storage section. and a diagnostic circuit that compares the test data stored in the cassette with the test pattern stored on the cassette magnetic tape, and according to test instructions from the main controller,
The present invention is characterized in that the data bus and control signals are drawn into the diagnostic circuit to confirm the normality of the cassette magnetic tape device and the data in the cassette magnetic tape.

(5) Examples of the invention Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a cassette magnetic tape device diagnostic circuit according to the present invention. In the figure, 1 is a main control unit that controls the functions of the device, 2 is a diagnostic circuit that diagnoses the cassette magnetic tape device, 3 is a cassette magnetic tape device that loads files, and 4 is a main controller that controls the cassette magnetic tape device. This is a control signal switching unit that pulls into the diagnostic circuit or the diagnostic circuit.

In the present invention, the cassette magnetic tape device 3
When diagnosing the cassette magnetic tape, the control signal switching section 4 is switched and controlled to draw the data bus and control signals of the cassette magnetic tape device 3 to the diagnostic circuit side, read out the data in the cassette magnetic tape sequentially, and check the normality of the data. Let's do it.

FIG. 2 is a block diagram showing a specific embodiment of the diagnostic circuit 2 shown in FIG. In the same figure, the same reference numerals as in FIG. 1 indicate the same contents, and 5 indicates the start of the test operation according to the test instruction from the main control unit 1, notification of the test result, reading of the test data on the file, and collation of the test data. 6 is a test data storage unit in which correct data is stored to confirm the normality of the read data;
8 is a read data storage section for temporarily storing test data on a file; 8 is a lead-in control line; 9 is a read data storage section for temporarily storing test data on a file;
indicate lead-in data lines, respectively.

The operation of the diagnostic circuit will be described below.

First, a test instruction from the main control section 1 is sent to the processor 5 in the diagnostic circuit 2 via the a-line. The test cycle at this time is controlled by the main control section 1. Next, in order to pull the cassette magnetic tape device 3 into the diagnostic circuit 2 side, the pull-in control line 8 of the control signal switching section 4 is turned "ON". When turned “ON”, the control signal connection with the main control unit is cut off, allowing the diagnostic circuit to control. Thereafter, the control block on the cassette file of the cassette magnetic tape device 3 is read out, and the data is stored in the read data storage section 7. On the other hand, test data is stored in the test data storage section 6 in advance. Read data storage section 7
The test pattern section stored in the test pattern section and the test data stored in the test data storage section 6 are read out by the processor 5, and the test pattern and the test data are compared. The comparison result is then notified to the main control unit 1 via the b line. Furthermore, the main control unit 1 notifies the maintenance person based on the comparison result.

FIG. 3 is an explanatory diagram of the data format of a file in a cassette magnetic tape device. In the same figure, 10
indicates a cassette magnetic tape, and the data content is 256
Each block of bytes is filed in a file.
Of the data contents, 11 are control blocks, 12 ₀
~12 _o The control program is executed for each multiple blocks (each
256 bytes) indicates the program block stored on the tape. The control block 11 includes a program loading address section 13, an entry address section 14, and a test pattern section 15.
It is composed of. The program loading address section 13 stores the start address at which the control program should be loaded, the entry address section 14 stores the address to which control should be transferred after loading is completed, and the test pattern section is checked by the diagnostic circuit to determine whether the control program is normal or not. This is an area to store test data for confirming the accuracy of the test data. That is, this test data is read out to a diagnostic circuit to detect an abnormality in the loading circuit or an abnormality in the cassette magnetic tape device.

(6) Effects of the Invention As explained in detail above, the cassette magnetic tape device diagnostic circuit of the present invention draws the cassette magnetic tape device into the diagnostic circuit side and periodically checks the normality of the cassette magnetic tape device and the data on the cassette magnetic tape. Since it is possible to perform a diagnosis based on the system, it is highly effective in making it possible to detect system failures at an early stage.

[Brief explanation of the drawing]

FIG. 1 is a cassette magnetic tape device diagnostic circuit according to the present invention, FIG. 2 is a block diagram of a specific embodiment of the diagnostic circuit 2 shown in FIG. 1, and FIG. 3 is a file data format of the cassette magnetic tape device. FIG. In the drawings, 1 is a main control unit, 2 is a diagnostic circuit,
3 is a cassette magnetic tape device, 4 is a control signal switching unit, 5 is a processor, 6 is a test data storage unit,
7 is a read data storage section, 8 is a lead-in control line, 9
is a lead-in data line, 10 is a cassette magnetic tape,
11 is a control block, 12 is a program block, 13 is a program loading address section,
Reference numeral 14 indicates an entry address section, and 15 indicates a test pattern section.

Claims (1)

[Scope of Claims] 1. In an information processing system in which a control program stored on a cassette magnetic tape is loaded from a cassette magnetic tape device to a main control unit side to execute program processing, a data bus of the cassette magnetic tape device and a signal switching means for drawing control signals to the diagnostic circuit side; a test data storage section for storing test data for confirming the normality of data read from the cassette magnetic tape device; a diagnostic circuit that compares the test data stored on the cassette magnetic tape with the test pattern stored on the cassette magnetic tape, and transmits the data bus and control signals to the diagnostic circuit side according to a test instruction from the main controller A diagnostic circuit for a cassette magnetic tape device, characterized in that the circuit draws in the cassette magnetic tape device and confirms the normality of the cassette magnetic tape device and the data in the cassette magnetic tape.