MS-DOS: Microsoft operating systems manufactured before Windows

Microsoft was founded in April 4, 1975 Microsoft migrated from Albuquerque, North Mexico, to Bellevue, Washington, January 1, 1979 Microsoft officially registered the company in June 25, 1981 In August 12, 1981, IBM launched Microsoft's 16-bit operating system MS-DOS 1.0 PC. MS-DOS is short for Microsoft Disk Operating System, meaning the Disk Operating System provided by Microsoft. Before Windows 95, DOS was the most basic device for PC-compatible computers, while MS-DOS was the most commonly used PC-compatible DOS. The most basic MS-DOS system consists of an MBR-based BOOT program and three file modules. These three modules are the input and output modules (IO. SYS), the file management module (MSDOS. SYS), and the COMMAND interpretation module (COMMAND. COM ). In addition, Microsoft has added several standard external programs (that is, external commands) to the retail MS-DOS system package, which corresponds to internal commands (that is, commands. COM command) to build a relatively complete human-machine interaction environment in the disk operation era. For a variety of commands for the MS-DOS, see the MS-DOS command list. MS-DOS generally uses the command line interface to receive the user's command, but in the later MS-DOS version, DOS program can also call the corresponding DOS interrupt to enter the graphics mode, that is, the graphic interface program under DOS.