What is an operating system? Introduction to operating system knowledge

The core of the system software is the operating system. Operating system is a large software system composed of the program template and data structure which is run by command and management computer system, its function is to manage the hardware resources and software resources of computer, and to provide efficient and considerate service for users. The operating system is closely related to hardware, is the first layer of software added to the "bare metal", most of the other software is operated under the control of the operating system, and people also use the computer with the support of the operating system. The operating system is the interface between hardware and software.

Common operating systems include Unix/xenix, MS-DOS, Windows XP, Linux, and OS/2. The following is a brief description of the development process and functional characteristics of these operating systems.

　　( 1 ) DOS Operating System

DOS was originally developed for the IBM PC operating system, so it has low requirements for the hardware platform. Even for the high version of Dos 6.22, the 640KB memory, 60MB hard drive, 80286 microprocessor environment, can also be normal operation. The DOS operating system is a single-user, single task, character interface, and 16-bit operating system. As a result, its management of memory is limited to a 640KB range. DOS has 3 different brands, which are the dr-dos of Microsoft's MS-DOS, IBM's Pc-dos and Novell company. These 3 dos are compatible, but there are some differences.

　　( 2 ) Windows Operating System

Windows is the first generation of Windows multitasking system released by Microsoft in November 1985, which enabled the PC to enter the so-called graphical user interface era. In 1995, Microsoft launched the Windows 95 operating system, and in 1998 Microsoft Company launched Windows 95 's improved version of Windows 98. One of the biggest features of Windows 98 is the integration of Microsoft's Internet browser technology into Windows 98, making access to Internet resources as easy as accessing a local hard drive, So as to better meet the increasing demand of people to access Internet resources. Windows 95, the Windows 98 operating system is a single user, multitasking, 32-bit operating system.

At the dawn of 2000, Microsoft has launched the Windows 2000 version. Not only does it absorb many of the highlights of Windows 98 and Windows NT, but it is Windows 98 and

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