JPH05174008A - Information processor - Google Patents

Abstract

PURPOSE:To attain the use of several types of software having the different CPU access addresses and stored in a dictionary ROM with no correction given to those software. CONSTITUTION:When the software is set to an information processor, a CPU 1 sets the data showing the position of the address of a dictionary ROM5 required by the software on a memory map to a dictionary ROM address designating register 7. When the information is read out of a memory by the CPU 1, the address given from the CPU 1 is compared with the address set at the register 7 by an address comparator 8. Then a read signal is outputted to the ROM 5 only when the coincidence is confirmed between both addresses, and an access is given to the ROM 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information processing apparatus such as a word processor equipped with a dictionary ROM for fixedly holding dictionary data for Japanese conversion processing.
The present invention relates to an information processing device that can use a plurality of types of software having different access addresses in a dictionary ROM.

[0002]

2. Description of the Related Art Some information processing apparatuses, such as a Japanese word processor, are provided with a so-called dictionary ROM that fixedly holds dictionary data for Japanese conversion processing. As shown in FIG. 5, such an information processing apparatus has a central processing unit (hereinafter, CPU: Centrai Processing).
51), a RAM 52 in which an area for storing operation programs and processing data is formed, an input device 53 such as a keyboard, an output device 54 such as a CRT or a liquid crystal display device, and the dictionary ROM 55. Is equipped with
The CPU 51 executes various software to control each part and perform arithmetic processing to operate the information processing device.

[0003]

In the above conventional information processing apparatus, as shown in FIG. 6, the CPU 51 has the dictionary ROM 5
The memory address for accessing 5 is fixed, and in other information processing devices with different specifications, the dictionary ROM 5
The access addresses of 5 are different. Therefore, when software for information processing devices having different specifications created on the assumption of another dictionary ROM address is used in the information processing device, the CPU 51 causes the dictionary ROM 55 to operate.
Can not access the data.

Therefore, software that requires access to the dictionary ROM 55 and that is newly created must specify a dictionary ROM address. Then, the dictionary R created for information processing devices having different specifications
In the case of existing software having different OM addresses, the access address of the dictionary ROM 55 needs to be corrected before it can be used in the information processing apparatus.

The present invention has been made in view of the above, and an object thereof is to provide an information processing apparatus which can use a plurality of types of software having different access addresses in a dictionary ROM without modification.

[0006]

In order to solve the above problems, an information processing apparatus of the present invention is a read-only fixed storage device in which predetermined information is fixedly written, for example, a storage means including a dictionary ROM. An information processing apparatus including a central processing unit that reads information from the storage unit and controls each unit and performs arithmetic processing includes the following units.

In other words, the information processing apparatus sends an address designating section for designating an address when the information in the fixed storage apparatus is accessed from the central processing unit and a designated address of the address designating section from the central processing unit. Address conversion means for comparing the address of the central processing unit with the address of the central processing unit when the information is read from the storage unit by the central processing unit. The read signal is output to the fixed storage device only when the specified address is matched.

[0008]

According to the above structure, the information processing apparatus is provided with the address converting means having the address designating section and the address comparing section. Then, when the information is read from the storage means by the central processing unit, the address from the central processing unit is compared with the designated address of the address designating section by the address comparing section, and only when the both match, the address converting section A read signal is output to the fixed storage device, and information in the fixed storage device is accessed.

By changing the setting of the address designation section of the address conversion means, the memory address of the fixed storage device is assigned to an arbitrary position in the memory map of the central processing unit. That is, the address conversion means can arbitrarily change the address when the information in the fixed storage device is accessed from the central processing unit.
The information processing apparatus can operate with respect to several kinds of software having different access addresses of a fixed storage device such as a dictionary ROM.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS.

As shown in FIG. 2, a word processor (hereinafter referred to as a word processor) as an information processing apparatus according to the present embodiment has a central processing unit (hereinafter referred to as a CPU) 1 as shown in FIG.
A RAM 2 in which an area for storing document information and control information of a word processor is formed; an input device 3 such as a keyboard;
An output device 4 such as an RT or a liquid crystal display device, a dictionary ROM (fixed storage device) 5 which is a read-only memory in which a dictionary used for Japanese conversion processing and the like are fixedly written, and a dictionary ROM 5 from the CPU 1. An address conversion circuit (address conversion means) 6 having a function of arbitrarily changing an address for access is provided.

The RAM 2 and the dictionary ROM 5, the ROM (not shown) storing the operation program, and the auxiliary storage device constitute storage means. And
The CPU 1 includes the above-described units that form the information processing device,
It is connected via a system bus 12 composed of an address bus 9, a control bus 10 and a data bus 11 (see FIG. 1), reads information from the storage means, and controls each part and performs arithmetic processing.

As shown in FIG. 1, the address conversion circuit 6 has a dictionary ROM address designating register (hereinafter referred to as register) 7 as an address designating unit for designating an address on the memory map of the dictionary ROM 5. is doing. When the software is set in the word processor, the upper bit of the address indicating the position on the memory map of the dictionary ROM address required by the software is set in the register 7 by the CPU 1.

In the case of the present embodiment, the CPU 1 has a function of outputting the data of a 24-bit address, and the upper 4-bit data of this address is used to specify the position on the memory map of each segment. It RAM2
The address of the dictionary ROM 5 is 20 bits, and these addresses correspond to the lower 20 bits of the address from the CPU 1. The upper 4 bits that specify the location on the memory map of the dictionary ROM differ depending on the software specifications, but the lower 20 bits are the same for all software.

Therefore, in the case of the present embodiment, when the software is set in the word processor, the CPU 1 initializes the upper 4 bits of the dictionary ROM address required by the software in the register 7. There is. The setting operation of the register 7 by the CPU 1 will be described below based on the flowchart shown in FIG.

First, when the software is set in the word processor (S1), the CPU 1 reads the information (4-bit data) currently stored in the register 7 so that the memory map of the current dictionary ROM is displayed. Confirm the address (S2).

The word processor can recognize which software dictionary corresponds to which address on the memory map.
The RAM 2 has a table in which information about a plurality of software with different access addresses of the dictionary ROM 5 (that is, the upper 4 bits of the dictionary ROM address) is stored. Therefore, the CPU 1 compares the information of the dictionary ROM address of the set software with the information read in S2 to determine whether or not the dictionary ROM 5 needs to be moved (S3).

Then, the CPU 1 judges that "moving is unnecessary" if both compared information match, and does not change the contents of the register 7, while if the information does not match, "moving necessary". Then, the contents of the register 7 are rewritten with information indicating the dictionary ROM address of the set software (S4). As described above, every time the software is set in the word processor, the contents of the register 7 are changed according to the software.

As shown in FIG. 1, the address conversion circuit 6 has an address comparison circuit (address comparison unit) 8 having one input side connected to the register 7 and the other input side connected to the CPU 1. ing. The output side of the address comparison circuit 8 is connected to the dictionary ROM 5. This address comparison circuit 8 is provided with the upper 4 bits of the address set in the register 7 as described above and the actual CPU 1
The upper 4 bits of the address from are compared, and only when they match, a read signal is output to the dictionary ROM 5 to enable access to the dictionary ROM 5.

The operation of the word processor of this embodiment when software that requires access to the dictionary ROM 5 is used in the above configuration will be described below.

First, when the software is set in the word processor, the dictionary R required by the software is set.
The upper 4 bits of the address indicating the position of the OM address on the memory map are set in the register 7 of the address conversion circuit 6 by the CPU 1 (see FIG. 3). After this setting operation is completed, the software can be executed.

When the CPU 1 reads the information in the storage means (RAM 2 or dictionary ROM 5) according to the above software, the CPU 1 sends the address (24) to the dictionary ROM 5 or other storage means via the address bus 9 as shown in FIG. Output). At the same time, the CPU 1 also outputs the address (24 bits) to the address comparison circuit 8 of the address conversion circuit 6.

At this time, the address comparison circuit 8 uses the C
The upper 4 bits of the address (24 bits) from the PU 1 are compared with the 4 bits of information set in the register 7, and only when both match, the control bus 1
A read signal is output to the dictionary ROM 5 via 0.

At this time, the dictionary ROM 5 receives the read signal from the address comparison circuit 8 and receives the read signal from the CPU 1
The data of the address specified by the lower 20 bits of the address from is output to the CPU 1 via the data bus 11.

On the other hand, when the upper 4 bits of the address (24 bits) from the CPU 1 and the 4-bit information set in the register 7 do not match, the address comparison circuit 8 gives "mismatch" to the CPU 1. A signal (for example, “0”) indicating the above is output. In this case, the CPU 1 outputs the read signal directly to the designated address on the memory map via the control bus as usual.

When another software having a different access address of the dictionary ROM is set in the word processor, the setting of the register 7 of the address conversion circuit 6 is changed by the CPU 1, and the dictionary ROM 5 and the RAM 2 of the dictionary ROM 5 and RAM 2 are changed in the same manner as described above. The data is accessed.

In the word processor of this embodiment, a dictionary ROM
The memory address 5 is assigned to an arbitrary position in the memory map of the CPU 1 as shown in FIG. 4 according to the setting of the register 7 of the address conversion circuit 6. This allows
The word processor of this embodiment is capable of operating several kinds of software having different access addresses in the dictionary ROM 5 without modifying the software.

In this embodiment, the fixed storage device is the dictionary R.
Although the OM5 is used, the present invention is not limited to this and may be another fixed storage device that stores information other than the dictionary.

In the present embodiment, the routine shown in the flowchart of FIG. 3 allows the software to be set in the word processor so that the register 7 automatically sets the address on the memory map according to the software. However, the following configuration may be adopted, for example. That is, when setting the software in the word processor, the user operates the input device 3 such as a keyboard to set the address on the memory map according to the software in the register 7.

[0030]

As described above, the information processing apparatus of the present invention includes an address designating section for designating an address when the information in the fixed storage device is accessed from the central processing unit.
An address conversion unit having an address comparison unit for comparing a designated address of the address designation unit with an address from a central processing unit, the address conversion unit reading information from the storage unit by the central processing unit. In operation, the read signal is output to the fixed storage device only when the address from the central processing unit matches the designated address of the address designating unit.

Therefore, by changing the setting of the address designation section of the address conversion means, the address when the information in the fixed storage device is accessed from the central processing unit can be arbitrarily changed. As a result, the information processing apparatus of the present invention has the effect of being able to use several types of software with different access addresses in a fixed storage device such as a dictionary ROM without modification.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a block diagram showing a configuration of a main part of a word processor as an information processing apparatus.

FIG. 2 is a block diagram showing a schematic configuration of the entire word processor.

FIG. 3 is a flowchart showing an operation of a central processing unit of the word processor.

FIG. 4 is an explanatory diagram showing that the memory address of the dictionary ROM of the word processor is assigned to an arbitrary position in the memory map of the central processing unit.

FIG. 5 is a block diagram showing a conventional example and showing a schematic configuration of an entire information processing apparatus.

FIG. 6 is an explanatory diagram showing that a memory address of a dictionary ROM of the information processing device is fixed to a predetermined position of a memory map of the central processing unit.

[Explanation of symbols]

1 central processing unit 2 RAM (storage means) 5 dictionary ROM (fixed storage device, storage means) 6 address conversion circuit (address conversion means) 7 dictionary ROM address designation register (address designation section) 8 address comparison circuit (address comparison section)

Claims (1)

[Claims] 1. A storage device including a read-only fixed storage device in which predetermined information is fixedly written, and a central processing unit that reads information from the storage device and controls each part and performs arithmetic processing. In the information processing device, an address designating unit for designating an address when the information in the fixed storage device is accessed from the central processing unit,
An address conversion unit having an address comparison unit for comparing a designated address of the address designation unit with an address from a central processing unit, the address conversion unit reading information from the storage unit by the central processing unit. In operation, the information processing device outputs a read signal to the fixed storage device only when the address from the central processing unit coincides with the designated address of the address designating section.