JPH022202B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording power outage countermeasure device that enables accurate registration data to be written when a power outage occurs in a device that magnetically records registration data.

The method of writing data to a cassette tape is normally performed as shown in FIG. 10 in Figure 1
0 is a cassette tape. A, B, and C are each data. An interrecord gap (hereinafter referred to as IRG) within the length of the standard must be ensured between data so that it can be read by all cassette decks specified by the standard. The write unit of one data block is indicated by c in the figure. The data part is called d, and about half of the IRG that touches the beginning part of the data is called a, and a is called the first half IRG. touches the end of the data
About half of IRG is called b, and b is called the second half IRG.
The writing unit of one block data consists of first half IRG + data + second half IRG. Data is recorded on the tape as it is fed in the direction of arrow A.

In systems in which data is magnetically recorded on cassette tapes and processed off-line, the data recorded on cassette tapes is particularly valued as important data in commercial transactions. Therefore, even if a power outage occurs in a system using cassette tapes, the data recorded on the cassette tapes must be reliably written to the tapes.

Conventionally, the following methods have been used as countermeasures in the event of a power outage.

First, if a power outage occurs in the first half IRGa in Figure 1, after the power outage recovers, the cassette deck writes the data that was being processed at the time of the power outage into the next recording area of the cassette tape.What is in the recording area at the time of the power outage? Since the data is not written, an empty area is created and a useless part is left on the cassette tape.

Second, if a power outage occurs at part b in Figure 1, after the power is restored, the cassette deck writes the same data as the data that was previously written to the next area of the cassette tape, resulting in double recording of the same data. conduct.

Third, if a power outage occurs at part d in Figure 1, after the power outage is restored, the cassette deck leaves the partially written data intact and transfers the data that was to be processed at the time of the power outage to the next recording area on the cassette tape. The data written halfway is left as error data, leaving a useless part where the error data is written.

The first case is wasteful from the point of view of efficient use of the cassette tape, and the second case is just as inefficient as the first, but at the same time requires another machine to process this data. In some cases, the burden of having to determine whether the same data has been recorded twice increases. The third case is as inefficient as the first case, and at the same time, when this data is read by another machine, it becomes a hassle to process it as error data.

Furthermore, as recorded in Japanese Patent Laid-Open No. 52-88316, a sequence number is included in the data recorded on the cassette tape, and the sequence number of the data recorded on the cassette tape is stored in the memory. Then, when a power failure occurs and the power is restored, the cassette tape is driven in the rewinding direction, and when data with a sequence number one smaller than the sequence number stored in memory is read from the cassette tape, the cassette tape is stopped and the next block is started. In other words, it is possible to start recording to a cassette tape from the sequence number data stored in memory in the event of a power outage.
Are known. According to this conventional technology, a sequence number must be recorded separately from the necessary data for each block of data, and the sequence number must be removed when reading the necessary data, which requires extra processing. In addition, the number of digits to be assigned to the sequence number must be determined, and the originally required data capacity is also limited.

The present invention can eliminate the first, second, and third drawbacks without recording sequence numbers on a cassette tape, efficiently record data on a magnetic recording means, and record accurate data on a magnetic recording means. It is intended to be recorded. An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of one embodiment of the present invention. 12 is a keyboard for inputting registration data; 1
0 is a control circuit that stores registered data from the keyboard 12, calculates it, and operates circuits and devices described later; 11 is a display that displays registered data in accordance with signals from the control circuit 10; 13 is a keyboard A printer 16 prints out the registration data inputted from the keyboard 12, a memory 16 stores the registration data inputted from the keyboard 12, the program necessary to operate the control circuit 10, and the calculation data processed by the control circuit 10. 15 is a cassette deck for recording registration data and calculation data input from the keyboard 10 onto a cassette tape 100; 14 is a power outage detection circuit that sends a power outage detection signal to the control circuit 10 when a power outage occurs.

FIG. 3 shows a current data buffer area 163 for storing data to be recorded on the cassette tape 100 in the memory 16 in FIG. 2, and a cassette tape 1.
The data recorded one data before is stored in 00, and as the data in the current data buffer area 163 is recorded on the cassette tape 100, the data is updated to the data in the current data buffer area 163. Data buffer area 16
4. A power outage detection flag area 162 that stores a power outage detection flag set in the memory 16 by the control circuit 10 based on the power outage detection signal sent from the power outage detection circuit 14, and the cassette tape 100 is taken out from the cassette deck 15 and replaced. A cassette exchange flag area 161 is shown in which the control circuit 10 stores a cassette exchange flag that is set in the memory 16 by notifying the control circuit 10 of the change.

FIG. 4 is a flowchart showing the operation when writing registration data and calculation data to cassette tape 100.

FIG. 5 is a diagram showing a write operation after power recovery. Arrow A indicates the running direction of the cassette tape 100. A indicates the previously written data recording portion. B shows the part where the data written this time is recorded. TM indicates tape end mark. PD ▽ sign indicates that a power outage has occurred. Arrows #1 and #2 indicate tape end mark writing operations. The arrow #3 indicates the operation to create a 500mm margin (hereinafter referred to as 500mm erase).
Arrow #4 indicates tape rewinding, and arrow #5 indicates a read operation for comparing the data in the previous data buffer area 164 with the data written on the cassette tape 100. The arrow #6 indicates rewinding by the data block compared in the operation #5, and the arrow #7 indicates further rewinding by one data block. The arrow #8 indicates the data in the previous data buffer area 164 and the cassette tape 10.
A read operation for comparing with data recorded in 0 is shown. The arrow #9 indicates rewinding by the data block compared in the operation #8, and the arrow #10
The arrow indicates further rewinding by one data block. Arrow #11 indicates a read operation for comparing the currently written data written on the cassette tape with the data in the previous data buffer area 164. The arrow #12 indicates rewinding by the data block compared in the operation #11, and the arrow #13 indicates rewinding by one more data block.
#14 arrow is previous data buffer area 164
The operation of comparing the data recorded on the cassette tape 100 with the previously written data recorded on the cassette tape 100 is shown.
The arrow #15 indicates the data in the previous data buffer area 164 and the cassette tape 1 in the operation #14.
10 shows an operation in which data in the current data buffer area 163 is written to the cassette tape 100 when the previous write data written to 00 matches.

FIG. 6 shows the state of the cassette tape 100 after the series of processing operations shown in FIG. 5 are completed after the power is restored. The operation of the present invention will be explained using FIGS. 4 and 5.

The registered data key-input from the keyboard 12 is stored in the current data buffer area 163 of the memory 16.
is memorized. This time data buffer area 163
When the writing is completed, the data in the current data buffer area 163 is recorded on the cassette tape 100. When recording on the cassette tape 100 is completed, the data in the current data buffer area 163 is transferred to the previous data buffer area 164, and the current data buffer area 163 is in a state of waiting for the next registered data to be input. Next, keyboard 12
The registered data keyed in is stored in the data buffer area 163 and then proceeds to be written to the cassette tape 100. This time, the data in data buffer area 163 is on cassette tape 10.
If a power outage occurs while the data is being written to 0, the power outage detection circuit 14 sends a power outage detection signal to the control circuit 10, and the control circuit 10 sets the power outage detection flag in the memory 16 in response to this signal. do.

After the power failure is restored, the control circuit 10 confirms that the power failure detection flag in the memory 16 is set. Next, a search is made to see if the cassette exchange flag in memory 16 is set. If the cassette exchange flag is set here, the control circuit 10
commands the cassette deck 15 to rewind the cassette tape 100 once to the beginning (hereinafter referred to as the beginning process), and when the beginning process is completed, the data in the current data buffer area 163 is transferred to the cassette tape. Proceed to writing operation.

Next, the operation when the aforementioned cassette exchange flag is not set in the memory 16 will be explained.

After the power failure is restored, the control circuit 10 confirms that the power failure detection flag in the memory 16 is set. Next, a search is made to see if the cassette exchange flag in memory 16 is set. At this time, since the cassette exchange flag has not been set, a tape end mark is written by providing an arbitrary margin from the area where writing was currently being performed. Continuously, create an arbitrary margin and write the tape end mark again. Furthermore, perform 500mm erase processing.
Next, add the cassette tape 10 to the length of the 500mm erase part and before writing the second tape end mark.
Rewind 0. After the rewinding is completed, the control circuit 10 compares the rewound portion with the data in the previous data buffer area 164. In the first comparison, there is a discrepancy because a tape end mark is recorded on the cassette tape 100. Next, the cassette tape 100 is rewound for the comparison data block described above. Further, the cassette tape 100 is rewound to the point before the first tape end mark written after the power is restored.
Then, a comparison operation similar to that described above is performed. The second comparison operation also results in a mismatch. Next, the cassette tape 100 is rewound for the data block compared for the second time, and further rewound to the head portion of the data block to which data has been written this time, that is, the first half IRG portion. Then, the contents of the previous data buffer area 164 and the current data recorded on the cassette tape 100 are compared. The third comparison operation also results in a mismatch. Then, the cassette tape 100 is rewound for the data block compared for the third time, and then the cassette tape 100 is rewound to the first half IRG portion of the data block where data is recorded this time.
Then, the data in the previous data buffer area 164 and the data recorded on the cassette tape 100 are compared. If a match is detected in this comparison operation, the control circuit 10 instructs the cassette deck to provide an IRG of a specified length following the previous data and proceed to write the current buffer data again.

If the data in the previous data buffer area 164 and the data recorded on the previous cassette tape 100 do not match, the cassette tape 100 is rewound for the previous data block and then rewound to the first half IRG of the previous data block. The data in the previous data buffer area 164 is compared with the data recorded on the cassette tape 100 two times before.
Since this operation results in a mismatch, the same operation as described above is repeated until the BOT mark at the beginning of the cassette tape 100 is searched. If the BOT mark is detected, the control circuit 10 determines that there is no matching data and instructs the display 11 to display a warning to replace the cassette tape 100. The operator of this apparatus inserts a new cassette tape 100 into the cassette deck in accordance with the warning and completes the exchange process. In response to the replacement of the cassette tape 100, the control circuit 10
The cassette exchange flag is temporarily set in the memory 16. In response to the cassette exchange flag being set, the control circuit 10 finds the tape head of the cassette tape 100 on the cassette deck and records the data of the current data buffer area 163 in the first data write portion of the cassette tape 100. Then, the cassette tape 100 is advanced by the length of the second half IRG in preparation for writing the next data. The tape end mark mentioned above is erased when the next data is written.

In this way, in the above-described embodiment, the cassette tape 100 can be used efficiently without creating unnecessary empty areas. Furthermore, even if erroneous recording is made on the cassette tape 100 at the same time as a power outage occurs, since the above-mentioned processing is performed again, there is an effect that accurate data can be recorded without leaving erroneous data.

Since the tape end mark is temporarily written as a process after the power is restored, when a cassette tape for which the above-mentioned cassette tape replacement warning has been issued is read and processed by another device, the process ends up to the tape end mark. If there is no tape end mark and the data is only recorded halfway on the cassette tape,
It is possible to improve the wasteful operation of reading the cassette tape up to the EOT mark (the last mark of the recorded portion of the cassette tape).

According to this invention, a registration data input means for inputting registration data; a magnetic recording means for magnetically recording the registration data inputted by the registration data input means;
A power outage occurrence circuit that detects the occurrence of a power outage; a first storage area for storing registration data to be written in the magnetic recording means; a second storage area to which data in the first storage area is transferred; the power outage detection circuit detects that a power outage has occurred, and when the power outage is restored, the data is stored in the second storage area; The recorded data is compared with the data recorded in the magnetic recording means, and when the data match, the data in the first storage area is recorded in the recording area of the magnetic recording means that was being processed at the time of the power outage. Since it is equipped with a control circuit that records the sequence number on the magnetic recording means, there is no need to record the sequence number on the magnetic recording means, and there is no wasted area on the magnetic recording means, which limits the amount of data that is originally required. This is not necessary and the magnetic recording means can be used efficiently. Further, even if erroneous recording is made at the same time as a power outage occurs, accurate data can be recorded without leaving erroneous data.

[Brief explanation of drawings]

Figure 1 shows the cassette tape recording format when recording data on a cassette tape. FIG. 2 is a block diagram showing the configuration of this device. FIG. 3 is a memory configuration diagram showing the arrangement of parts necessary for explaining the present invention in the memory 16 shown in FIG. 2. FIG. 4 is a writing flowchart showing the sequence of operations when writing data to a cassette tape. FIG. 5 shows the operation of the cassette deck and the recording state of the cassette tape after a power outage occurs and after the power is restored. FIG. 6 shows the recording state of the cassette tape after the processing operations shown in FIG. 5 have been completed. 10...Control circuit, 11...Display device, 12...
Keyboard, 13...Printer, 14...Power outage detection circuit, 15...Cassette deck, 16...
Memory, 161...Cassette exchange flag area,
162... Power outage detection flag area, 163... Current data buffer area, 164... Previous data buffer area.

Claims (1)

[Claims] 1. Registration data input means for inputting registration data;
a magnetic recording means for magnetically recording the registration data inputted by the registration data input means; a power outage occurrence detection circuit for detecting the occurrence of a power outage; a first storage area for storing the registration data written in the magnetic recording means; and a second storage area to which data in the first storage area is transferred in response to completion of writing of the registered data in the magnetic recording means; when a power outage occurs by the power outage occurrence detection circuit. When the power outage is restored after detecting that the
The data stored in the first storage area and the data recorded in the magnetic recording means are compared, and when the data match, the data in the first storage area is recorded at the time of the power outage. A power outage countermeasure device for magnetic recording comprising a control circuit configured to record in a recording area of a recording means. 2. A magnetic recording medium exchange flag that is set when the magnetic recording medium is exchanged in the memory by the magnetic recording means and is reset when one or more pieces of registered data are recorded on the magnetic recording medium, and a power failure occurrence detection flag. 2. A power outage countermeasure device for magnetic recording according to claim 1, further comprising a power outage detection flag that is set in accordance with the power outage and reset after the control circuit detects the set signal after the power outage is recovered. 3. The apparatus according to claim 1, further comprising an alarm generating means for notifying an operator of the discrepancy when the data stored in the second storage area and the data written in the magnetic recording means do not match. Power outage countermeasure device for magnetic recording. 4. A power outage countermeasure device for magnetic recording according to claim 1, wherein a tape end mark indicating that the final data has been recorded is temporarily recorded on the magnetic recording medium upon recovery from a power outage.