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

MS-DOS (Microsoft disk operating system) is a disk operating system provided by Microsoft in the United States.

Single-user single-task OS means that only one user is allowed to be on 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 the system configuration by editing two system files located in the root directory of the boot disk, that is, CONFIG.SYS and AUTOEXEC.BAT,IO.SYS will view the 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, but in later versions of MS-DOS, DOS programs can also enter graphical mode by calling corresponding DOS interrupts, that is, graphical interface programs under DOS.

Previous versions of MS-DOS do not support FAT32, long filenames, and large hard drives. These are fully supported since MS-DOS 7. 0, especially in MS-DOS version 7. 10.

Composition:

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

Basic input and output module

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

IO.SYS module

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

MSDOS.SYS

MSDOS.SYS is used to realize file management, including file management, directory management, memory management and so on. It implements the program-level interface between the user and the MS-DOS in the form of function calls.

COMMAND.COM

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

Bootstrap

The bootstrap program is also called "boot record". Its function is to check whether there are two system files on the current disk, and if so, load the DOS system into memory from disk. A system disk should contain modules such as boot record, IO.SYS, MSDOS.SYS and COMMAND.COM.

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