JPS59188719A - System starting system - Google Patents

Abstract

PURPOSE:To prevent a program from being out of order, by writing a prescribed identification mark in a sector of the bootstrap loader section of a system disk and judging the presence of absence of the identification mark at the time of system starting. CONSTITUTION:A sector of a bootstrap section is designated by a floppy disk controlling program written in the ROM of a microcomputer and the presence or absence of an identification mark in the sector is judged. When the identification mark exists, a system program is taken-in in accordance with its bootstrap loader and the system is started. When the indentification mark does not exist as in the case where another floppy disk is wrongly inserted into a disk driving device 3, error processing to its effect is performed and starting of the system is inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a system startup method, and, for example, to a technique effective for the startup method of a system program written on a floppy disk.

[Background technology]

For example, system programs such as high-level languages that take up a relatively large number of steps are usually written on floppy disks, so they must be loaded into RAM (random access memory). At the time, an initialization program read the bootstrap section (fixed sector) of a floppy disk inserted into a floppy disk drive and started it up unconditionally.

However, if you accidentally insert a disk that does not have the system program written on it, meaningless information will be treated as a program, and the program will run out of control and be stored in the main memory, its Frembie disk, etc. A problem arises when information is destroyed.

[Purpose of the invention]

An object of the present invention is to provide a system disk startup method that prevents a program from running out of control due to an erroneous operation at system startup as described above.

The above and other objects and novel features of this invention include:
It will become clear from the description of this specification and the accompanying drawings.

[Summary of the invention]

A brief overview of typical inventions disclosed in this application is as follows.

That is, write a predetermined identification mark in the sector of the bootstrap loader section of the system disk, and
By determining the presence or absence of the identification mark at the time of system startup, it is possible to prevent an undesired program from running out of control.

〔Example〕

FIG. 1 shows a block diagram of an embodiment of a microcomputer system to which the present invention is applied.

In the figure, 1 is a microcomputer, which is comprised of various devices such as a central processing unit (microprocessor) and a RAM. Since such a microcomputer is well known, detailed explanation thereof will be omitted.

A floppy disk control device 2 forms various control signals for the floppy disk drive device 3 in accordance with control signals from the microcomputer.

FIG. 2 shows a storage configuration diagram of a floppy disk as a system disk. In this embodiment, although not particularly limited, the number of tracks consists of 77 tracks from 0 to 76, and 27 sectors from sectors O to 26 are allocated to each trunk.

In this embodiment, although not particularly limited, two o-tracks are used.
Predetermined identification marks as shown by diagonal lines are written in six sectors.

Therefore, when this system disk is inserted into the floppy disk drive, the microcomputer's RO
The floppy disk control program, in other words, the initialization program, written in M (read-only memory) etc. specifies the sector of the bootstrap section (track 01 sector 26) and checks whether or not there is an identification mark in it. Determine. If there is an identification mark (YES), the system program is loaded according to the bootstrap loader, in other words, the system is started.

Unlike the system floppy disk described above, if there is no identification mark (No), as is the case when another floppy disk is inserted into the disk drive device 3 by mistake, an error process to that effect is performed and the system Prohibit startup.

〔effect〕

(1) By inserting the identification mark and adding a determination program therefor, it is possible to reliably prevent the program from running out of control as described above.

(2) Since the above (1) prevents the program from running out of control, it is possible to prevent the information written on the floppy disk or other storage device from being destroyed.

(3) Since the error processing described above displays a message to that effect, it is possible to immediately correct an erroneous operation.

Although the invention made by the present inventor has been specifically explained above based on Examples, it goes without saying that this invention is not limited to the above Examples and can be modified in various ways without departing from the gist thereof. Nor.

[Application field]

In the above explanation, the invention made by the inventor of the present application is mainly applied to system startup using a system disk, which is the background of the invention, but the invention is not limited to this, and the invention is not limited to this. In some cases, the above problem occurs, so for example, if the EPROM
It can also be applied to detecting firmware using (electrically programmable ROM). Further, it can be similarly used for magnetic disks, magnetic tapes, valve memories, magnetic drums, etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a microcomputer system showing an embodiment of the present invention. FIG. 2 is a storage configuration diagram showing an embodiment of a system disk. FIG. 3 is a block diagram of a microcomputer system showing an embodiment of the invention. It is a flowchart figure. 1. Microcomputer, 2. Floppy disk control device, 3. Floppy disk drive bag device No. 1 Strategy 2 Figure 101 - Figure 3

Claims (1)

[Scope of Claims] 1. A predetermined identification mark is written in the bootstrap loader section of a system program written in a replaceable storage medium, and the identification mark detection program is provided at the time of system startup to detect the identification mark. A system startup method characterized by executing a system startup program only when the system starts. 2. The system startup method according to claim 1, wherein the storage medium is a floppy disk. 3. The system startup method according to claim 1, wherein when the detection program determines that there is no identification mark, a display to that effect is displayed.