JPH07129396A - Method for patching read-only storage device - Google Patents

Abstract

PURPOSE:To reduce cost or time for correction by executing the pseudo correction of contents without substituting an unrewritable ROM device. CONSTITUTION:A BIOS 2 transfers the data of an address requested from an application program 1 to a ROM device 3 and inputs the data in a read buffer 21. In order to check the existence of correcting data in the data inputted to the buffer 21, the BIOS 2 reads out a patch table 23 from a magnetic disk device 4. When correcting data corresponding to the read address exist, patch data 22 or corresponding correction data in the patch data 22 are read out from the device 4 and the correcting position of the data inputted to the buffer 21 is corrected. Then the BIOS 2 transfers the corrected data in the buffer 21 to the buffer address requested from the program 1. Consequently data are corrected/updated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a patch method for a read-only storage device, and more particularly to a patch method for making data in a non-rewritable storage device used in a computer system pseudo rewritable.

[0002]

2. Description of the Related Art Conventionally, a non-rewritable read-only storage device (for example, a ROM or a CD-ROM,
There is no particular technique for correcting the data stored in the ROM (hereinafter, referred to as ROM). Therefore, when it is necessary to improve the function or correct the trouble, the ROM itself is replaced regardless of the correction amount. .

[0003]

In the above-mentioned conventional technique, when the data stored in the ROM is modified, it is replaced with a new read-only storage device, so that a new ROM is obtained, There is a drawback that it takes a lot of money and time for replacement work.

An object of the present invention is to solve such a problem and to enable pseudo modification of contents without replacing a storage device such as a ROM, thereby reducing the cost and time required for the modification. It is to provide a patch method to reduce.

[0005]

A patch method for a read-only storage device according to the present invention is a computer system including a non-rewritable ROM and a rewritable storage device. If it is necessary to modify the data in the ROM, read the corresponding data from the ROM, modify the data using the modified data, and artificially modify and update the data stored in the ROM. Is characterized by. Also, a magnetic disk device or a non-volatile RAM
May be

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram for realizing an embodiment of the present invention. As shown in FIG. 1, this embodiment is provided with a CD-ROM device (hereinafter referred to as a ROM device) 3 which is a non-rewritable storage device and a magnetic disk device 4 which is a rewritable storage device, and a ROM. A computer system having a CD-ROM control BIOS (hereinafter referred to as BIOS) 2 for controlling the device 3. BI
The OS (Basic I / O System: Basic Input / Output Control System) is a control program for controlling the basic functions depending on the hardware in the operation system (OS), and is incorporated in the software.

The magnetic disk device 4 has a patch address indicating the correction address of the corresponding ROM device in advance,
It is also assumed that patch data for storing correction data is written. The patch address and patch data are correction position information and correction data of a CD-ROM medium (hereinafter referred to as a ROM medium) mounted on the ROM device 3, and data corresponding to the ROM medium mounted in advance is stored on the floppy disk. It is read from a device (not shown) or the like. Further, the patch table associates the correction address and the correction range of the corresponding ROM medium with the address where the correction data on the patch data is stored.

In the computer system of this embodiment, the application program 1 is the BIOS 2
When a data read request is made to the
Read control is performed on the M device 3 (read control), data at the address requested by the application program 1 is transferred and read into the read buffer 21 (data transfer). Next, the BIOS 2 reads the patch table 23 from the magnetic disk device 4 (patch table read) in order to confirm the presence / absence of correction data in the data read in the read buffer 21.

Next, when there is correction data for the read address requested by the application program 1, the BIOS 2 further reads the patch data 22 or the corresponding correction data in the patch data 22 from the magnetic disk device 4 (patch data). Read), and correction (patch input) is performed on the correction position of the ROM medium data read into the read buffer 21. Then BI
The OS 2 transfers the modified data in the read buffer 21 to the buffer address requested by the application program 1 and copies it. Through the above processing, the data on the ROM medium is corrected and updated.

Although a magnetic disk device is used as a rewritable storage device in the present embodiment, it is also possible to use a nonvolatile RAM.

[0011]

As described above, according to the present invention, when the data stored in the ROM or the CD-ROM, which is a non-writable storage device connected to the computer system, is corrected, the ROM or the CD-ROM itself. Since it is pseudo-corrected and updated using the correction data stored in the magnetic disk device without exchanging the data, there is an effect that the cost and time for the correction can be reduced.

[Brief description of drawings]

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

[Explanation of Codes] 1 application program 2 CD-ROM control BIOS (BIOS) 3 CD-ROM device (ROM device) 4 magnetic disk device 21 read buffer 22 patch data 23 patch table

Claims (2)

[Claims] 1. In a computer system comprising a non-rewritable read-only storage device (ROM) and a rewritable storage device, correction data is stored in advance in the rewritable storage device, and the read-only storage is stored. When the data correction of the device is necessary, it is necessary to read the corresponding data from the read-only storage device, correct the data using the correction data, and artificially correct and update the data stored in the read-only storage device. A method of patching a read-only storage device characterized. 2. The patch method for a read-only storage device according to claim 1, wherein the rewritable storage device is a magnetic disk device or a non-volatile RAM.