What operating system is ms-dos?

ms-dos refers to Microsoft Disk Operating System, which is a single-user single-task operating system. MS-DOS adopts a module structure, which consists of five parts: BIOS module, IO.SYS module, MSDOS.SYS module, COMMAND.COM module and boot program in ROM.

#The operating environment of this article: windows10 system, thinkpad t480 computer.

MS-DOS (Microsoft Disk Operating System) is a disk operating system provided by Microsoft Corporation of the United States.

Single-user single-task OS means that only one user is allowed to log on to the computer, and only the user program is allowed to run as a task. MS-DOS is a single-user single-task operating system.

MS-DOS users can control system configuration by editing two system files located in the root directory of the boot disk. They are CONFIG.SYS and AUTOEXEC.BAT. IO.SYS will view CONFIG .SYS to load the specified hardware driver, and then automatically execute the batch instructions contained in AUTOEXEC.BAT.

MS-DOS generally uses the command line interface to accept user instructions. However, in later versions of MS-DOS, DOS programs can also enter graphics mode by calling the corresponding DOS interrupt, that is, graphics under DOS. interface program.

Earlier versions of MS-DOS did not support FAT32, long file names, and large hard disks. Starting from MS-DOS 7.0, especially MS-DOS 7.10 version, these are fully supported.

Composition:

MS-DOS adopts a module structure, which consists of five parts: BIOS module in ROM, IO.SYS module, MSDOS.SYS module, COMMAND .COM modules and bootloaders.

Basic input and output module

There is a read-only internal memory (foreign language abbreviation: ROM) chip on the personal computer motherboard, which contains the system self-test program , complementary metal oxide semiconductor (CMOS) setup program and basic input and output program (foreign language abbreviation: BIOS). BIOS is a set of programs and parameter tables. The program part is a set of drivers that can be called through interrupts. The parameters give the addresses and parameters of the peripherals. BIOS is the interface between computer hardware and operating system, through which the operating system manages computer hardware resources.

IO.SYS module

IO.SYS is the interface program between MS-DOS and ROMBIOS. It completes the management of system devices together with ROM BIOS.

MSDOS.SYS

MSDOS. SYS is used to implement file management, including file management, directory management, memory management and other functions. It implements the program-level interface between users and MS-DOS in the form of function calls.

COMMAND.COM

The main function of COMMAND.COM is to receive, recognize, interpret and execute MS-DOS commands entered by users from the keyboard.

Boot program

The boot program is also called "boot record". Its function is to check whether there are two system files on the current disk. If there are system files, DOS The system loads memory from disk. A system disk should contain: boot record, IO. SYS, MSDOS. Modules such as SYS and COMMAND.COM.

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