JPH0773111A - Document processor - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to prevent the destruction of predetermined data stored in a storage medium. [Configuration] A feature is that the CPU 100 secures unused areas 111 and 118 that exclude the first and last specific areas in the SRAM 103 from the data storage area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document processing device,
In particular, the present invention relates to a document processing device including an SRAM or RAM card with a memory backup function using a battery.

[0002]

2. Description of the Related Art In a conventional document processing apparatus, an SRAM or a RAM with a memory backup function by a battery is used.
When the card is provided, the beginning and the end of the memory area are particularly likely to be damaged due to power-on, power-off, and momentary power-off due to power supply conditions. I understand.

It is also empirically known that memory destruction is destroyed from an arbitrary position to the front half and the rear half.

In response to these accidental data destruction, the conventional document processing apparatus leaves only the head area of the SRAM or RAM card unused or allocates an ID for confirming the validity of these memories only in the memory head area. It was.

Further, when the read / write area in the SRAM or RAM card is sequentially checked, the already stored data is temporarily stored in the DRAM which cannot be backed up by the battery.

[0006]

As described above, the conventional S
The RAM or RAM card causes data destruction due to handling, and valuable data such as user data and system data is lost, and the program does not operate normally depending on a change state of stored contents due to the data destruction. There was a problem such as malfunction.

Further, in order to perform a memory check at the time of reading / writing data from / to an SRAM or a RAM card, etc., if a power interruption occurs while storing existing data in a volatile memory such as a DRAM, it is being checked. The problem that the data was destroyed was met.

The present invention has been made to solve the above problems, and prevents the destruction of predetermined data stored in a storage medium by limiting the use of the start area and the end area of the storage medium. Another object of the present invention is to provide a document processing apparatus capable of recognizing a normally usable area in a storage medium while determining the state of destruction of predetermined data stored in the storage medium.

[0009]

The first document processing apparatus of the present invention comprises a securing means for securing an unused area for excluding the first and last specific areas in the storage medium from the data storage area. is there.

The second document processing apparatus of the present invention comprises a securing means for securing an unused area for excluding the first and last specified areas in the storage medium from the data storage area, and the first and last specified areas in the storage medium. A data storage state of the storage medium by collating each identification information written in each boundary area with identification information writing means for writing predetermined identification information for judging a data writing state in a boundary area with the area And a setting means for setting a normally usable storage area by executing data write / read diagnostic processing or initialization processing of the used area of the storage medium based on the determination result of this judgment means. It is a thing.

In the third document processing apparatus of the present invention, the setting means saves the data written in the use area to the boundary area immediately before executing the data writing / reading diagnostic processing of the use area of the storage medium. It is configured in.

A fourth document processing apparatus of the present invention is configured to use an unused area of a storage medium as a work area for function calculation.

The fifth document processing apparatus of the present invention comprises a storage medium as an external memory medium which can be attached and detached.

[0014]

In the first aspect of the present invention, since the securing means secures an unused area for excluding the leading and final specific areas in the storage medium from the data storage area, the data is stored in the leading and final specific areas of the storage medium. Even if a defective area occurs, it is possible to prevent the predetermined data from being destroyed.

In the second aspect of the present invention, the setting means determines the data storage state of the storage medium by collating the identification information written in each boundary area with the setting means based on the determination result. By executing the data write / read diagnostic process or the initialization process to set the storage area that can be used normally, the identification information written in each boundary area is collated to recognize the defect in the used area and can be used normally. It is possible to secure a large area.

In the third aspect of the present invention, since the setting means saves the data written in the use area to the boundary area immediately before executing the data write / read diagnosis processing of the use area of the storage medium, the data write / read operation is performed. Even if a power failure occurs during execution of the read diagnosis process, it is possible to reset predetermined data that guarantees normal operation.

In the fourth aspect of the present invention, since the unused area of the storage medium is used as the work area for the function operation, the unused area can be used as effectively as possible.

In the fifth aspect of the present invention, the storage medium is composed of a removable external memory medium, and even if the first and last specific area regions in the storage medium are destroyed by the attachment / detachment operation, the external memory It is possible to write / read data normally using the medium.

[0019]

【Example】

[First Embodiment] FIG. 1 is a perspective view showing the outer appearance of a document processing apparatus according to the first embodiment of the present invention, which corresponds to, for example, a portable word processor, and (a) shows a state when the main body is used. , (B) show the state when the main body is stored.

In FIG. 1, reference numeral 1 denotes a keyboard, on which keys for inputting characters such as letters and numbers and a key group 2 such as a controller are arranged, and a hinge 3 is rotated around a hinge 3 when not in use (when the main body is stored). Thus, it can be folded as shown in (b). Reference numeral 4 denotes a paper feed tray for feeding a sheet-shaped recording medium to the printer unit inside the apparatus, and is similarly housed so as to cover the entire surface of the printer unit when not in use as shown in (b). 5 is a knob for manually setting or ejecting a recording medium, and 6 is an input sentence or the like that can be displayed at the same time as a printed matter in accordance with character modification information such as a typeface of characters, size, underline, bold face characters, etc. Bit matrix type indicator, 7
Is a handle used when the main body is conveyed, and 8 is a printer unit for printing an input sentence, for example, by scanning a bubble jet type print head for printing.

FIG. 2 shows a first example of the document processing apparatus shown in FIG.
3 is a block diagram illustrating the control configuration of FIG.

In the figure, 100 is a CPU in the form of a microcomputer for executing document processing, and 101 is a ROM.
In addition, a processing program for executing the document processing as shown in FIGS. 4 to 6 executed by the CPU 100 and other fixed data are stored. 102 is a CPU 100 related to document processing
It is a DRAM that functions as a work area and a text data storage. The DRAM 102 is not backed up by a battery. Reference numeral 103 denotes an SRAM that is backed up by a memory that stores user data such as document files and system data. 1
A bus line 04 transfers address signals, data signals, control signals and the like between the CPU 100 and each device, that is, 101 to 103 and the keyboard 1, the display 6, and the printer unit 8.

FIG. 3 is a diagram showing a memory map of the SRAM 103 shown in FIG.

In the figure, 111 is an unused area of the memory head area, and 112 is an unused area of the memory head area 111.
, An ID area for storing ID information, 113 to 115 are data storage areas for checking by reading and writing from the memory, 113 is a data storage area for storing a flag indicating that power is turned off during the memory check, Reference numeral 114 denotes a data storage area for storing the address of the data under check indicated by the data storage area 113, and 115 has already been stored in the memory under check indicated by the data storage areas 113, 114. Is a data storage area for storing. A data storage area 116 stores system data and user data. An ID area 117 stores ID information following the unused area 118 of the memory area.

As described above, according to the first aspect of the invention, the securing means (CPU 100) removes unused areas (areas 111 and 118) for excluding the first and last specified areas in the storage medium (SRAM 103) from the data storage area. Since the data is ensured, it is possible to prevent the predetermined data from being destroyed even if the defective data areas occur in the first and last specific areas of the storage medium.

The memory access operation in the document processing apparatus according to the present invention will be described below with reference to the flow charts shown in FIGS. The procedures shown in FIGS. 4 to 6 are the same as those of the ROM 101 or the DRAM 1 shown in FIG.
02 etc. are stored in the RAM.

FIG. 4 is a flow chart showing an example of the first power-on processing procedure in the document processing apparatus according to the present invention. Note that (1) to (7) indicate each step.

When the power is turned on, the SRAM 103 I
It is determined whether or not a normal value is stored in the D area 112 (1). If NO, that is, if the SRAM 103 has not been initialized, a step (6) for starting an initialization routine described later. If YES, it is judged whether or not a normal value is stored in the ID area 117 (2). If NO, that is, the data is destroyed due to some factor even if it has been initialized. Since it is considered that the data is unreliable, the process proceeds to step (6) to start the initialization routine described later, and Y
If it is ES, that is, if it is determined that a normal value is stored, it is determined that the SRAM 103 has been initialized, the check flag 113 is referred to, and when the power is turned off immediately before, the SRAM 103 The value of the check flag 113 is "0" indicating whether the memory is being checked.
If it is NO, it is determined that the memory check is in progress. Therefore, the saved data 115 is stored in the address indicated by the address 114 to recover the data (4). After that, the memory check processing routine of the SRAM 103 is executed (5), and it is determined whether or not the memory check is normally completed (7). If NO, the processing ends abnormally, and if YES, the initial processing of the SRAM 103 ends normally.

As described above, according to the second aspect of the present invention, the determination means for determining the data storage state of the storage medium (SRAM3) by collating the identification information (ID) written in each boundary area (area 112, 117). Since the setting means (by the CPU 100 in this embodiment) executes the data writing / reading diagnostic process or the initialization process of the used area of the storage medium based on the determination result of the (CPU 100), the normally usable storage area is set. The identification information written in each boundary area is collated to recognize a defect in the used area, and a normally usable area can be secured.

As described above, in the third invention, the setting means (CPU 100) causes the data written in the use area data area 116 immediately before the data writing / reading diagnostic processing of the use area of the storage medium (SRAM 103) is executed. Is saved in the boundary area (areas 112 to 115), it is possible to reset the predetermined data that guarantees the normal operation even if the power is interrupted during the data writing / reading diagnostic processing.

FIG. 5 is a flow chart showing an example of a detailed procedure of the initialization processing routine shown in FIG. In addition,
(1)-(13) show each step.

First, the start address of the SRAM 103, for example, "0000H" is set in the address variable i (1). Next, "00" is added to the check data variable a.
"H" is substituted (2), and the data a is stored at the address i (3). Next, the data b is read from the address i (4), and it is judged whether or not the data a and the data b have the same value to judge whether or not the data can be correctly written to the address i ( 5). If a = b is not determined in this determination, the SRAM 103 is determined to be abnormal and the processing ends abnormally. If a = b, it is determined whether the data a is "FFH" (6), and "FFH" is determined.
If not, the check data is updated by adding "55H" to the data a (7), and the process returns to step (3). In this way, by the series of operations of steps (2) to (7), “00H”, “55H” “,“ AAH ”,“ FFH ”for the address i on the SRAM 103 is obtained.
It is possible to check the writing of four types of data.

Then, the value of the check data a is "FF.
If it is "H", it is determined that the check for a certain address i is completed, so the value of the address variable i is incremented (8) to prepare for the check of the next address. Next, the address variable i is SRA
By checking whether or not the final address of M103 is exceeded, it is checked whether or not the check has been completed for all areas of SRAM 103 (9), and if not yet, return to step (2) to move to the next address. Continue memory check for i.

On the other hand, if it is determined in step (9) that the address variable i exceeds the final address of the SRAM 103, the memory check is terminated and the SRAM
First unused area 111 and last unused area 1 of 103
18 stores the data "00" (10), stores the ID information in the ID area 112 following the head unused area 111 (11), and stores the ID area 11 immediately before the last unused area 118.
7 stores the ID information (12), and stores the data “00” in the memory check flag area 113 (13).
The initialization of M103 is completed normally.

FIG. 6 is a flow chart showing an example of a detailed procedure of the memory check processing routine shown in FIG. Note that (1) to (11) indicate each step.

First, the memory check flag 113 is set to "F
By setting it to "FH" (1), it indicates that the memory check is in progress. Next, the SRAM 10 is set to the address variable i.
The start address of 3, for example, "0000H" is substituted (2). Next, the check data “0” is assigned to the data variable a.
0H ”is set (3), the data a is stored in the address i (4), the data b is read from the address i (5),
A read / write check of the address i is performed by judging whether the write data a and the read data b match (6). If a ≠ b, the process ends abnormally, but a =
In the case of b, it is judged whether the check data a is "FFH" (7), and if it is not "FFH", the data a
The check data for address i is updated by adding "55H" to (8), and then the process returns to step (4) to continue the memory check for address i.

On the other hand, the check data a is "FFH" in the judgment of the step (7), that is, the address variable i is incremented to prepare for the memory check of the next address (9). Next, the address variable i is SRAM1.
It is judged whether it has exceeded the final address of 03 (1
0), if not exceeded, the process returns to step (3) to continue the memory check.

On the other hand, if it is determined in step (10) that the address variable i exceeds the final address of the SRAM 103, the memory check flag 113.
By clearing 0 to (11), the SRAM 103
Completes the memory check for all areas of. As shown above, the memory check for a certain address i of the SRAM 103 is realized by the series of processes of steps (3) to (7), and the whole process of the SRAM 103 is performed by the series of processes of steps (2) to (10). Realize memory check for area. In the flowcharts shown in FIGS. 5 and 6, during the memory check, the check address i is saved in the address save area 114 in the SRAM 103, and the data stored in the check address i immediately before the check is started in the SRAM 103. It is added that the data is saved in the internal data save area 115.

The memory area is divided into several parts,
By performing initialization or memory check for each, the initialization area for recovery from memory destruction can be limited, and damage may be reduced. [Second Embodiment] FIG. 7 is a block diagram for explaining the second control configuration of the document processing apparatus shown in FIG. 1. The same parts as those in FIG. 2 are designated by the same reference numerals.

In the figure, 9 is a RAM card, which has the same memory map as the SRAM 103 shown in FIG.
Memory access is performed according to the flowcharts shown in FIGS.

As described above, according to the fifth aspect of the invention, the storage medium is composed of the removable external memory medium (RAM card 9), and the first and last specific area regions in the storage medium are accompanied by the attachment / detachment operation. Even if the data is destroyed, normal data writing / data reading using the external memory medium becomes possible. [Third Embodiment] FIG. 8 is a block diagram for explaining the third control configuration of the document processing apparatus shown in FIG. 1. The same parts as those in FIG. 2 are designated by the same reference numerals.

In the figure, 103A is a battery-backed SRAM for storing user data such as document files and system data, which is a memory backed up by a text memory 1031 for storing documents created by the user and a user for registering words by the user. The dictionary 1032 is divided into areas of the format memory 1033 which are stored to determine the arrangement of each sentence created by the user. 10
Reference numeral 5 is an SVC unit that provides a check for word miss spelling and a correct word, and also accesses a user dictionary 1032 that stores words that the user arbitrarily registers.

FIG. 9 is a diagram showing a memory map of the SRAM 103A shown in FIG.

In FIG. 9, 111 is an unused area in the memory head area, and 121 is an unused area 11 in the memory head area.
122 to 12 which is the beginning of the text memory area 1031 following 1 and stores the ID information of the text memory
Reference numeral 4 denotes a data storage area for checking by reading / writing the text memory, and the data storage area 122 stores a flag indicating that the power is turned off during the memory check of the text memory area. The data storage area 123 stores the address of the data being checked shown in the data storage area 122. The data storage area 124 stores the data that has already been stored in the memory being checked, which is indicated by the data storage areas 122 and 123. Reference numeral 125 is a text data area for storing raw data of a document created by the user, and 126 is the text memory 1031.
Is an area which is arranged at the final position of and stores the ID information of the text memory. 127 to 132 correspond to the user dictionary information area 1032, 127 is an area for storing the ID structure of the user dictionary, 128 to 130 are data storage areas for checking by reading and writing the user dictionary, and 128 is a memory of the user dictionary area. An area for storing a flag indicating that the power is turned off during checking, 129 is an area for storing an address of data in the check flag stored in the data storage area 128, and 130 is the area 128, 1
An area for storing the data already stored in the memory being checked, which is indicated by 29, 131 is an area for storing a word registered by the user, 132 is arranged at the final position of the user dictionary information area 1032, and the user dictionary Areas 133 to 138 corresponding to the format data area of the format memory area 1033.
Reference numeral 3 is an area for storing ID information of the format memory area, 134 to 136 are data storage areas for checking by reading and writing of the format memory area, 134
Is an area for storing a flag indicating that the power is turned off during the memory check of the format memory area, 135 is an area for storing the address of the data under check shown in the data storage area 134, and 136 is the data storage area An area for storing the data already stored in the memory under check indicated by 134 and 135, an area 137 for storing the format information, and 138 an ID of the format memory arranged at the final position of the format information memory area 1033. Area for storing information, 118 is SRA
It is an unused area at the final position of the M103A or the RAM card 9. The second memory check processing operation in the document processing apparatus according to the present invention will be described below with reference to the flowchart shown in FIG.

FIG. 10 is a flowchart showing an example of the second power-on processing procedure in the document processing apparatus according to the present invention. Note that (1) to (18) indicate each step.
Note that each procedure shown in FIG. 10 corresponds to the ROM 101 shown in FIG.
Alternatively, it is stored in a RAM such as the DRAM 102.

When the power is turned on, the text area 103
It is determined whether a normal value is stored in the ID areas 121 and 126 of 1 (1).
03A or the RAM card 9 is determined to have been initialized, the process proceeds to step (2) and subsequent steps. However, if the ID is determined to be abnormal in step (1), the text memory area 1031 is not yet initialized. It is considered that the data has not been initialized or has been destroyed by some factor even if it has been initialized, and the data is in an unreliable state. Therefore, the process proceeds to step (5), and the text memory area 103
1 is initialized, and the process proceeds to step (6) and thereafter.

On the other hand, if it is determined that the ID is normal, the check flag 122 of the text memory is referred to in step (2), and when the power is turned off immediately before, the memory check of the text memory area 1031 is being performed. It is determined whether it was.

Area 1 for storing the check flag
If the value of 22 is not "0", it is determined that the memory check is in progress, so the process proceeds to step (3) and the area 123
Data being saved to the address stored in
Stored in 24 and recovering data.

Then, in step (4), the memory check of the text memory area 1031 is performed, and in step (6), it is determined whether the memory check is completed normally. If the memory check is abnormally ended, the text memory area 1031 is executed.
Although the initial operation of (3) is ended, if the operation is normally ended, the process proceeds to step (7) to start the initial operation of the user dictionary information area 1032. Next, in step (7), the ID areas 121, 1 of the user dictionary information area 1032
It is determined whether or not a normal value is stored in 26, and if normal, the process proceeds to step (7), it is determined that the user dictionary information area 1032 has been initialized, and the process proceeds to step (8). If the ID is determined to be abnormal in (7), the user dictionary information area 1032
Is not initialized yet, or even if it has been initialized, it is considered to have been destroyed by some reason, and the data is in an unreliable state, so step (11)
Then, the process proceeds to and the user dictionary information area 1032 is initialized. I
If D is normal, in step (8), the check flag of the data area 128 of the user dictionary information area 1032 is referred to, and whether or not the memory check of the user dictionary information area 1032 was being performed immediately before the power was turned off. Make a decision. Here, if the value of the check flag of the data area 128 is not "0", it is determined that the memory check is being performed, so the process proceeds to step (9), and the data being saved is stored in the address of the data area 129. 1
Store in 30 and recover data. After that, the process proceeds to step (10), the memory of the user dictionary information area 1032 is checked, and it is determined in step (12) whether the memory check is completed normally. Although the initial operation of (3) is ended, if the operation is normally ended, the process proceeds to step (13) to start the initial operation of the format information memory area 1033. Then, in step (13),
ID area 13 of the format information memory area 1033
It is determined whether or not a normal value is stored in 3, 138, and if normal, the process proceeds to step (14), and it is determined that the format information memory area 1033 has been initialized, and the process proceeds to step (14). If the ID is determined to be abnormal in step (13), the format information memory area 1033 has not been initialized, or even if it has been initialized, it has been destroyed due to some factor. Since the data is considered unreliable, the process proceeds to step (17) to initialize the format information memory area 1033. If the ID is normal, the check flag 134 of the format memory area 1033 is referred to in step (14), and the format information memory area 1033 was immediately before the power was turned off.
It is determined whether or not the memory check of is being performed.

Here, if the value of the check flag of the data area 134 is not "0", it is determined that the memory check is being performed, so the process proceeds to step (15), and the data being saved is stored in the address of the data area 135. Data area 13
Stored in No. 5 and recover data. Then step (1
Proceeding to 6), the memory of the format information memory area 1033 is checked, and it is judged in step (18) whether the memory check is completed normally.
The initial operation of is finished. In addition, step (5),
Since the initialization processing routine of each memory area called in (11) and (17) corresponds to the initialization routine shown in FIG. 5 described above, description thereof will be omitted. Further, the processing routine for checking the reading and writing of each memory area called in steps (4), (10) and (18) is
Since it corresponds to the memory check processing routine shown in FIG. 6 described above, description thereof will be omitted.

Thus, the SRAM 1 shown in the first embodiment
The memory map different from that of No. 03, that is, by dividing the memory area into several areas and performing initialization and memory check for each, initialization for recovery from memory destruction The area can be limited, and the damage due to memory destruction can be minimized. [Fourth Embodiment] In the configurations shown in the first to third embodiments, if unused areas 111 and 118 are SRAMs, power is turned on, and if unused areas 111 and 118 are RAM cards, after mounting. As a temporary function calculation, for example, by using it as a work area when calculating the size of the mounted RAM, it is possible to effectively use the unused area.

As described above, according to the fourth aspect, since the unused area of the storage medium is used as the work area for the function calculation, the unused area can be used as effectively as possible.

[0053]

As described above, the first aspect of the present invention
According to the invention, since the securing means secures an unused area that excludes the first and last specific areas in the storage medium from the data storage area, a defective data area occurs in the first and last specific areas of the storage medium. However, it is possible to prevent the predetermined data from being destroyed.

According to the second aspect of the present invention, the setting means sets the use area of the storage medium on the basis of the determination result of the determination means for determining the data storage state of the storage medium by collating each identification information written in each boundary area. By executing the data write / read diagnostic process or the initialization process to set the storage area that can be used normally, the identification information written in each boundary area is collated to recognize the defect in the used area and can be used normally. It is possible to secure a large area.

According to the third aspect of the invention, the setting means saves the data written in the used area to the boundary area immediately before executing the data writing / reading diagnostic processing of the used area of the storage medium. It is possible to reset predetermined data that guarantees normal operation even if a power failure occurs during the read diagnosis process.

According to the fourth aspect, since the unused area of the storage medium is used as the work area for the function operation, the unused area can be used as effectively as possible.

According to the fifth invention, since the storage medium is composed of the removable external memory medium, even if the first and last specific area regions in the storage medium are destroyed by the detaching operation, the external memory medium is destroyed. You can write / read data normally by using.

Therefore, even if a defective area peculiar to the storage medium with the backup function by the battery occurs, it is possible to guarantee the normal data processing according to the predetermined data stored in the used area. Further, even if the data in the use area is destroyed, the occurrence of the destruction can be recognized and the predetermined data can be reset, so that normal data processing according to the predetermined data stored in the use area can be reproduced. And so on.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of a document processing apparatus showing a first embodiment of the present invention.

2 is a block diagram illustrating a first control configuration of the document processing apparatus shown in FIG.

FIG. 3 is a diagram showing a memory map of the SRAM shown in FIG.

FIG. 4 is a flowchart showing an example of a first power-on processing procedure in the document processing apparatus according to the present invention.

5 is a flowchart showing an example of a detailed procedure of an initialization processing routine shown in FIG.

6 is a flowchart showing an example of detailed procedures of a memory check processing routine shown in FIG.

FIG. 7 is a block diagram illustrating a second control configuration of the document processing apparatus shown in FIG.

FIG. 8 is a block diagram illustrating a third control configuration of the document processing apparatus shown in FIG.

9 is a diagram showing a memory map of the SRAM shown in FIG.

FIG. 10 is a flowchart showing an example of a second power-on processing procedure in the document processing apparatus according to the present invention.

[Explanation of symbols]

 1 Keyboard 6 Display 100 CPU 101 ROM 102 DRAM 103 SRAM 111 Unused Area 118 Unused Area

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G06K 19/073

Claims (5)

[Claims] 1. A document processing apparatus comprising storage means for holding predetermined data written in a predetermined storage medium by a battery, and an unused area for excluding the first and last specific areas in the storage medium from the data storage area. A document processing apparatus comprising a securing means for securing the. 2. A document processing apparatus comprising a storage means for holding predetermined data written in a predetermined storage medium by a battery, and an unused area for excluding the first and last specific areas in the storage medium from the data storage area. Securing means for securing the data, identification information writing means for respectively writing predetermined identification information for determining the data writing state in the boundary area between the first and last specific areas in the storage medium, and each boundary area Determination means for determining the data storage state of the storage medium by collating each piece of identification information written in the storage medium, and data writing / reading diagnostic processing or initialization processing of the used area of the storage medium based on the determination result of the determination means. And a setting unit that sets a storage area that can be normally used by executing the document processing apparatus. 3. The setting means saves the data written in the use area to the boundary area immediately before executing the data write / read diagnosis processing of the use area of the storage medium. Document processor. 4. The unused area of the storage medium is used as a work area for function calculation.
Document processing device described. 5. The document processing apparatus according to claim 1, wherein the storage medium is composed of a removable external memory medium.