Peripheral devices and their types

Peripheral devices of the computer are non-maincomponents of the computer system. Without them, the ability to perform basic functions remains. So, if the RAM modules connected to the motherboard, the CPU, the video adapter, the power supply unit are irreplaceable components, then the peripheral devices of the PC (personal computer) belong to the group of auxiliary computers.

For clarification, let us use an analogy, comparingcomputer with a human. Peripheral devices PC can be compared with hands and feet: they significantly expand the range of tasks to be solved. In this respect, computers benefit, since with the interface ports it is possible to connect any existing technical solutions, making the computing system universal.

Depending on the purpose, the following classification of peripheral devices is used:

- solutions for data input / output;

- devices for information storage needs;

- devices for the exchange of digital (or analog) streams with other components.

Let us dwell in more detail on each group.

Peripheral PC devices designed fordata entry, deservedly headed by a mouse and keyboard. The latter is a set of buttons, each of which corresponds to a certain binary code. It is with his help that the program part of the computer learns what exactly was pressed, including various combinations.

The modern keyboard is far from perfect, soas with prolonged work tired hands, the placement of symbols on the buttons is not optimal, the mechanism of returning the pressed key is not always qualitatively tuned. Almost all manufacturers offer improved models in which the above features are taken into account. However, they have too high a cost, which does not allow such decisions to occupy their niche in the mass market.

Depending on the method of connection, wired and wireless devices are distinguished. The same group can include game joysticks, pedals and rudders, light pistols, steering wheels for flight simulators.

The manipulator of the "mouse" type received a widedistribution after the popularization in operating systems of graphical interfaces, the elements of which are convenient to manage not by buttons, but by a pointer. Currently, there is a gradual replacement of classical wired solutions with more convenient ones that communicate with the computer by radio frequencies.

Input of information and its digitization is also carried out by scanners. These devices can be part of an office combine - the MFP, which combines a printer and a scanner in one housing.

There are not only stationary, but also manual solutions, which in some cases is very convenient.

Not having the ability to output resultswork, the computer would be a "thing-in-itself" - a kind of black box, completely useless. There are various output devices, the main one of which is a monitor. Without it, full work with the computer is impossible. Depending on the principle used to draw pictures, distinguish between CRT and LCD solutions.

In addition to forming an image on the screen, connecting the printer, you can get the ability to output data to paper or other such media.

Peripheral devices of the second group PC perform functions of long-term storage of digital data. These are hard drives, CDs, tape drives (media - tape), disk drives and flash drives.

Data exchange is entrusted to modems and network cards.