What are the common system software?

Common system software includes: DOS operating system, WINDOWS operating system, UNIX operating system, Linux, Netware and other operating systems; assembly language assembler, C language compiler, connector and other language processing programs; Access, Oracle , MySQL and other database management systems; auxiliary programs.

System software refers to a system that controls and coordinates computers and external devices, supports the development and operation of application software, and is a collection of various programs that do not require user intervention. The main function is to schedule, monitor and maintain computer systems; responsible for managing various independent hardware in the computer system so that they can work in coordination. System software allows computer users and other software to treat the computer as a whole without having to consider how the underlying hardware works.

Generally speaking, system software includes the operating system and a series of basic tools (such as compilers, database management, memory formatting, file system management, user authentication, driver management, network connection, etc. ), is that part of the software that supports the normal operation of the computer system and enables user operations.

System software is usually included with the computer system when it is purchased, and can also be installed separately as needed.

Main categories

System software not only provides the above basic functions for application software, but also manages the hardware so that it can Different application software running simultaneously or successively on a computer can use hardware devices in an orderly manner. For example, two application software have to store and modify data on the hard disk. If there is no coordination and management organization to demarcate areas for them, they will inevitably destroy each other's data.

Representative system software includes:

operating system

The operating system manages the computer's hardware devices so that application software can be used conveniently and efficiently Use these devices. Common ones on microcomputers include: DOS, WINDOWS, UNIX, OS/2, etc.

The most important and basic among computer software is the operating system (OS). It is the lowest level software. It controls all programs running on the computer and manages the resources of the entire computer. It is the bridge between the bare metal of the computer, applications and users. Without it, users cannot use a certain software or program.

The operating system is the control and management center of the computer system. From a resource perspective, it has four functions: processor, memory management, device management, and file management.

Commonly used systems include DOS operating system, WINDOWS operating system, UNIX operating system, Linux, Netware and other operating systems.

Language processing program

Compiled software The CPU only completes a very simple operation for each instruction executed. A system software or application software requires thousands of It is composed of tens of thousands or even hundreds of millions of instructions. Writing software directly using basic instructions is an extremely arduous and difficult task.

Computers can only directly recognize and execute machine language. Therefore, if you want to run high-level language programs on your computer, you must be equipped with a program language translation program. The translation program itself is a set of programs, and different high-level languages ​​have corresponding translation programs. .

Language processing programs such as assembly language assembler, C language compiler, connector, etc.

In order to improve efficiency, people specified a new set of instructions, called a high-level language, in which each instruction completes an operation. This operation is simple and basic relative to the overall function of the software, and It is complex compared to a single operation of the CPU. Writing programs (called source programs) in this high-level language is like using prefabricated panels instead of bricks to build a house. It is much more efficient. However, the CPU cannot directly execute these new instructions. You need to write a software specifically to translate each instruction in the source program into a series of basic instructions (also called machine language) that the CPU can accept, so that the source program can be converted into something that can be used on the computer. program running on it. Software that completes this translation is called high-level language compilation software, and they are usually classified as system software. Currently commonly used high-level languages ​​include VB, C, JAVA, etc. Each of them has its own characteristics and is suitable for writing a certain type of program. They all have their own compilation software.

Database Management

Database management system stores large amounts of data in an organized and dynamic manner, allowing people to use these data conveniently and efficiently.

Database management system is a large-scale software that manipulates and manages databases and is used to establish, use and maintain databases.

Foxpro, Access, Oracle, MySQL, Sybase, DB2 and Informix are database systems.

Auxiliary programs

System auxiliary processing programs are also called "software development tools", "support software" and "software tools". They mainly include editing programs and debugging Programs, equipment and connection programs, debugging programs.

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