KR19980046409A - Booting method by CD-ROM drive and its device - Google Patents

Abstract

The present invention relates to a CD-ROM (CD-ROM) drive which allows a personal computer (PC) to load an operating system from a disk into a RAM memory (RAM) via a CD-ROM (CD-ROM) drive. A booting method and apparatus thereof, comprising: a central processing unit that controls each component of the entire system and checks whether each component operates normally; A key input device for transmitting a command input by a user to the CPU through an input / output port; A hard drive having a large data storage capacity and a high input / output speed at a high speed of access; Floppy drives with relatively low storage capacity and slow access; A CD-ROM drive capable of accommodating more data than the hard drive and floppy drive using a head since data is stored and recovered using a laser beam; A BIOS with a built-in startup program to find system files in the following order: floppy drive, CD-ROM drive, hard drive, including CD-ROM driver to drive CD-ROM drive; And a RAM in which the system file found from the boot drive by the BIOS is loaded at a specific address.

Description

Booting method by CD-ROM drive and its device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a booting method and a device in which a personal computer (PC) loads an operating system from a disk to a RAM memory (RAM), and in particular, loads the operating system through a CD-ROM drive. The present invention relates to a booting method using a CD-ROM drive and a device thereof.

In general, a personal computer cannot do anything without running an operating system, software that prepares the environment for other software. Thus, a personal computer must load the operating system from disk into RAM memory, a method called bootstrap or simply booting.

The boot operation checks whether all hardware components are started before the operating system is loaded when the personal computer is powered on, and checks the power-on self-test (POST) to determine if the CPU and memory are operating properly. Test) alerts the user when something is wrong with a component, and has only two functions for searching the drive for the operating system.

When this feature is complete, the boot operation begins the process of reading operating system files and copying them into RAM. The reason for loading an operating system from disk like this is that it gives the user the opportunity to choose an operating system.

Now, a process of a general booting operation will be described in detail with reference to FIG. 1.

First, when power is applied, the CPU 11 performs a POST test immediately after startup of all hardware components of the personal computer and then the computer's basic input / output system (BIOS). (12) The startup program embedded in the chip checks floppy drive 18 A to see if it has a formatted floppy disk.

If the disk is loaded on the floppy drive 18, the program searches for the files that make up the first two parts of the operating system at specific locations on the disk. Since each system file is marked with a special file attribute that cannot be seen with the DOS DIR command, you cannot normally view this system file. On most personal computers, the file is named IO.SYS and MSDOS.SYS.

If the floppy drive 18 is empty, the startup program looks for system files on the hard drive 17. If there are no files on the boot disk, the startup program displays an error message.

After positioning the disk with the system files, the startup program reads the data stored in the first sector of the disk and copies the data to a specific location in RAM. This information constitutes a DOS startup record.

The startup record is in the same location on all formatted disks, about 512 bytes long and enough code to enable the loading of two hidden system files. After the BIOS startup program loads the startup record into memory at hexadecimal address 7C00, BIOS 12 transfers control to the startup record by branching to that address.

The startup record controls the personal computer, loads IO.SYS into RAM, and the IO.SYS file extends into the ROM BIOS 12 and includes a routine called SYSINIT that governs the rest of the bootup. When IO.SYS is loaded, the startup record is no longer needed and is replaced by another code in RAM 13.

The SYSINIT controls the startup process and loads MSDOS.SYS into RAM 13, and the MSDOS.SYS file works with the BIOS 12 to manage the files, execute programs, and respond to signals from the hardware. .

Also, SYSINIT searches the CONFIG.SYS file in the root directory of the startup disk, and if CONFIG.SYS is present, SYSINIT invokes MSDOS.SYS to execute the commands in the file. CONFIG.SYS is a file created by the user. The command indicates how the operating system manipulates the computer, such as how it is operated, how many files are opened at one time.

The CONFIG.SYS may also have a statement to load the device driver. A device driver is a file with code that extends the ability of the BIOS 12 to control memory or hardware devices.

SYSINIT invokes MSDOS to load the command com (COMMAND.COM) file. This operating system file consists of three parts. One is to extend the input / output capability, which is loaded into memory with the BIOS 12 and becomes a permanent part of the operating system.

The second part of COMMAND.COM has internal DOS commands such as DIR, COPY, and TYPE. This part is loaded at the end of the RAM 13 and can be rewritten by the application if memory is needed.

The third part of COMMAND.COM is used and removed only once. This section searches the AUTOEXEC.BAT file in the root directory. This file is created by the computer user and contains a series of DOS batch files and the name of the program that you want to run every time you turn on your computer.

Unexplained reference numeral 15 denotes a keyboard for transmitting a command input by a user to the CPU 11 through an I / O PORT 14, and 16 denotes a command inputted through the keyboard 15. Monitor to express the result.

That is, when a system environment is broken and needs to be reinstalled, most of the installation is performed using a floppy drive as described above. As the operating system of most personal computers is changed to a Windows environment, data is increased and the floppy drive is increased. It will take quite a while to install via.

Otherwise, the CD-ROM had to be accessed from a floppy drive before the CD-ROM could be used to read a large amount of data at high speed and then installed from the CD-ROM.

Therefore, the present invention was created in view of the above circumstances, and the CD-ROM driver enable driver is built into the BIOS, and the CD-ROM drive is designated through the setup so that booting through the CD-ROM is performed. It is an object of the present invention to provide a booting method and a device using a CD-ROM drive.

1 is a configuration block diagram of a device for performing a general boot operation;

2 is a block diagram of a booting apparatus using a CD-ROM drive according to the present invention;

3 is a flowchart of a boot process by the CD-ROM drive according to the present invention;

*** Explanation of symbols for main parts of drawing ***

11,21: Central processing unit (CPU) 12,22: BIOS

13,23 RAM 14,24 I / O port

15,25: Keyboard 16,26: Monitor

17,27: hard drive 18,28: floppy drive

29: CD-ROM drive

In the booting method of the CD-ROM drive according to the present invention for achieving the above object, when power is supplied to the personal computer, the electrical signal is sent to the central processing unit along the permanently programmed path of the internal memory register of the chip. A central processing unit initialization step of removing unnecessary data and resetting a CPU register called a program counter to a specific number; A system inspection step of performing a series of system inspections known as self experiments immediately after startup by the initialized central processing unit to find a startup program of the BIOS using the address; A setup step of designating the CD-ROM drive as the boot disk if there is a setup command for designating the CD-ROM drive as the boot disk; And a booting step of checking a floppy drive, a CD-ROM drive, and a hard drive in order to perform a boot if a system file exists.

A booting apparatus using a CD-ROM drive according to the present invention for achieving the above object is to control each component of the entire system, the central processing unit for checking whether or not the normal operation of each component; A key input device for transmitting a command input by a user to the CPU through an input / output port; A hard drive having a large data storage capacity and a high input / output speed at a high speed of access; Floppy drives with relatively low storage capacity and slow access; A CD-ROM drive capable of accommodating more data than the hard drive and floppy drive using a head since data is stored and recovered using a laser beam; A BIOS with a built-in startup program to find system files in the following order: floppy drive, CD-ROM drive, hard drive, including CD-ROM driver to drive CD-ROM drive; And a RAM in which the system file found from the boot drive by the BIOS is loaded at a specific address.

According to the present invention configured as described above, after performing the self-test immediately after startup, designating the CD-ROM drive as the boot disk during CMOS setup, the system file is searched in the order of the floppy drive, CD-ROM drive, and hard drive. If it exists, it will boot.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

FIG. 2 is a block diagram of a booting apparatus using a CD-ROM drive according to the present invention. Reference numeral 21 denotes a control unit for each component of the entire system. (CPU), 23 is a RAM in which the system file found from the boot drive by the BIOS 22 is loaded at a specific address, 25 is a command input by the user through the I / O PORT (24) It is a keyboard for transferring to the CPU 21.

Reference numeral 26 denotes a monitor for expressing a result of a command input through the keyboard 25, 27 a hard drive having a large data storage capacity and a fast input / output speed at a high access speed, and 28 a storage capacity relatively. A small, slow access floppy drive, 29, is a CD-ROM drive capable of accommodating more data than the hard drive 27 and floppy drive 28 using the head as data is stored and recovered using a laser beam. .

Reference numeral 22 denotes a startup program for finding system files in the order of the floppy drive 28, the CD-ROM drive 29, and the hard drive 27, including the CD-ROM driver for driving the CD-ROM drive 29. This is a built-in BIOS.

3 is a flowchart of a boot process by the CD-ROM drive according to the present invention.

As shown in the figure, when power is supplied to the personal computer (ST 301), the electric signal accordingly goes to the CPU 21 along the permanently programmed path to remove unnecessary data in the chip's internal memory register and is called a program counter. CPU initialization is performed to reset the called CPU register to a specific number (ST 302).

Then, the initialized CPU 21 finds a startup program of the BIOS 22 using the address, performs a series of system checks known as self tests immediately after startup (ST 303), and then turns the CD-ROM drive into the boot disk. If there is a setup command to designate (ST 304), the CD-ROM drive is designated as a boot disk (ST 305).

Then, the floppy drive is checked (ST 306), and if a system file exists, booting is performed (ST 307,308), otherwise, the CD-ROM drive is checked (ST 309), and if a system file exists, booting is performed ( If the system file does not exist in the CD-ROM drive, the hard drive is checked (ST 312). If the system file exists, booting is performed (ST 313,314). Otherwise, an error is displayed (ST 315). .

Meanwhile, the present invention is not limited to the above embodiments and can be variously modified within the scope not departing from the technical gist of the present invention.

According to the above, the present invention can be booted through a CD-ROM drive as well as a floppy drive and a hard drive, thereby making the installation process of an operating system having a large data capacity simple and quick.

Claims (2)

A central processing unit that controls each component of the entire system and checks whether each component operates normally; A key input device for transmitting a command input by a user to the CPU through an input / output port; A hard drive having a large data storage capacity and a high input / output speed at a high speed of access; Floppy drives with relatively low storage capacity and slow access; A CD-ROM drive capable of accommodating more data than the hard drive and floppy drive using a head since data is stored and recovered using a laser beam; A BIOS with a built-in startup program to find system files in the following order: floppy drive, CD-ROM drive, hard drive, including CD-ROM driver to drive CD-ROM drive; And And a RAM in which a system file found from the boot drive by the BIOS is loaded at a specific address. When power is applied to a personal computer, the resulting electrical signal goes to the central processing unit along a permanently programmed path, removing unnecessary data from the chip's internal memory registers and resetting the CPU registers, called program counters, to specific numbers. An initialization step; A system inspection step of performing a series of system inspections known as self experiments immediately after startup by the initialized central processing unit to find a startup program of the BIOS using the address; A setup step of designating the CD-ROM drive as the boot disk if there is a setup command for designating the CD-ROM drive as the boot disk; And A booting method using a CD-ROM drive, comprising: a booting step of checking a floppy drive, a CD-ROM drive, and a hard drive and performing a boot if a system file exists.