JPH04242430A - Operation program incorporated device - Google Patents

Abstract

PURPOSE:To alter an operation program which has a bug without replacing a whole ROM having the bug by setting addresses) indicating the entrances of respective modules in the ROM, in a control table in a RAM. CONSTITUTION:The operation consisting of plural modules is stored in the ROM 2 for the operation program. A module after debugging among the modules of the program is prepared in a correction ROM and inserted into an IC receptacle 4. An address for module access can be stored in the module control table 5 since one program in the operation program calls the corrected module. When the module for operation having the bus is replaced with the corrected module, an address for accessing this corrected module is stored in the module control table 5 and the address of the old module is altered. The addresses in the table 5 are changed and the corrected ROM is only added for the debugging.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device that stores an operating program in a read-only memory.

0002

2. Description of the Related Art A conventional device in which an operating program is stored in a read-only memory (hereinafter referred to as ROM) includes, in addition to the ROM, a processor for executing the program, a random access memory (hereinafter referred to as RAM), and peripheral circuits.

[0003] In such conventional devices, module management is insufficient. Therefore, if a bug occurs in a module, no matter how small the module is, the RO
The disadvantage is that the entire M must be replaced. Another disadvantage is that bug fixing requires debugging not only a specific module but also the entire program.

0004

OBJECTS OF THE INVENTION An object of the present invention is to provide a device with a built-in operating program that allows a buggy operating program to be changed without having to replace the entire ROM that stores the buggy operating program.

[0005]

SUMMARY OF THE INVENTION The apparatus of the present invention includes an operation program storage means for storing an operation program consisting of a plurality of modules, an address for accessing each module in the operation program storage means, and a modification of the address. The present invention is characterized in that it includes a module management table means capable of performing the following: and a correction read-only storage means for storing a bug-corrected module specified by a correction address from the module management table means.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention includes:
A central processing unit (hereinafter referred to as CPU) 1 is provided. This CP
U1 is connected to address bus 6 and data bus 7. These buses 6 and 7 are connected to the operating program ROM 2.
, an IC socket 4 for a modification ROM, and a RAM 3 containing a module management table 5, respectively. The ROM 2 stores operating programs. A ROM for correcting bugs when they occur is inserted into the IC socket 4. In the module management table 5, which is one of the features of the embodiment of the present invention, addresses indicating the entrance of each module in the ROM 2 are set.

The program structure in the ROM 2, which is another feature of an embodiment of the present invention, is as follows. That is, when it is desired to use another module within a program, the address of the module is specified by referring to the management table 5, and that module is called.

Referring to FIG. 2, the module management table 5 stored in the RAM 3 in the embodiment shown in FIG. The indicated addresses are stored respectively. A bug has now been found in module 1, and the correction ROM to fix this bug is an IC.
It is inserted into socket 4. In this case, since the new module 1 is stored in the modification ROM, the address indicating the entrance of the new module 1 is overwritten on the address indicating the entrance of the old module 1 in the module management table 5 of the RAM 3. .

As a result, one of the constituent elements of the operating program
By indexing the address of the new module 1 in the module management table 5, the module 0 that is the module 0 can call the new module 1 in which the bug has been corrected.

[0011]

[Effects of the Invention] The present invention sets the address indicating the entrance of each module in the ROM 2 in the management table 5 in the RAM 3, thereby changing the address in the table 5 and storing the bug-corrected module in the ROM. The effect is that a program with a bug can be changed simply by adding it.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing the relationship between modules in the ROM 2 and addresses in the management table 5 in FIG. 1;

3 is a diagram showing the relationship between modules in the correction ROM in FIG. 1 and addresses in the management table 5. FIG.

[Explanation of symbols]

1 CPU 2 ROM for operation program 3 RAM 4 IC socket 5 Module management table 6 Address bus 7 Data bus

Claims (1)

[Claims] 1. Operation program storage means for storing an operation program consisting of a plurality of modules, and module management table means for storing addresses for accessing each module in the operation program storage means and capable of modifying the addresses. and correction read-only storage means for storing a bug-corrected module specified by the correction address from the module management table means.