Plan:
1. What is a computer?
2. Base configuration of the computer
system
2.1 System unit
2.2 Monitor
2.3 Keyboard
2.4 Mouse
3. Internal devices of the system unit
3.1 Motherboard
3.2 Hard drive
3.3 Floppy dick drive and CD-ROM
3.4 Video card
3.5 Sound card
4. Systems of the mother board
4.1 RAM (Random Access Memory)
4.2 Processor
4.3 Chip of ROM and system of BIOS
4.4 Volatile memory
5. Peripheral devices of the PC
5.1 Data input devices
5.2 Data output devices
5.3 Data exchange devices
6. Functions of operation system of a
computer
7. Software
1. What is a computer?
The computer is
an electronic instrument, intended for automation, creation, storage,
processing and transportation of the data.
Computer - the
universal information computer. One of main assignments of a computer is
processing and storage of the information. With appearance of the computer
began possible to operate inconceivable earlier with information contents. In
the electronic form translate the libraries containing scientific and artistic
literatures. Old photos and film-archives find a new life numerically.
2. Base configuration of the computer
system
The personal
computer is universal technical system. His configuration (structure of the
equipment) can be changed as required. But there is a base configuration which
contains 4 devices : system unit, monitor, keyboard and mouse.
2.1 System unit
In a system unit
are placed the most important components which are called internal. To a system
unit also are connected external and peripheral units. On appearance system
units differ with the form of tank. Tanks can be horizontal (desktop) and
vertical (tower).
2.2 Monitor
Monitor is the
device of a visual data representation. This is main output device. Key parameters
of the screen monitor: size, frequency of upgrade (regeneration) maps, a class
of protection.
2.3 Keyboard
The keyboard is
the key control unit of the PC. Is used for input of the alphanumeric (sign)
data, and also commands of handle.
2.4 Mouse
The mouse is the
control unit manipulation type. As against the keyboard the mouse cannot be
used on a straight line for input of the sign information - the principle of
handle is event. Movements of the mouse and clicks of buttons are events.
3. Internal devices of the system unit
3.1
Motherboard
The motherboard is the host board of the
PC. It contains: the processor, a microprocessor package (chipset), buses, the
RAM, ROM (permanently storage device) and plugs for connection of additional
devices.
3.2 Hard drive
Hard disk is the main device for long-time
storage of the big sizes of the data and programs.
3.3 Floppy disk drive and CD-ROM
For operative carry of small information amount
use floppy disks which are inserted into a special disk drive. Standard floppy
disk has a size of 3.5 inches, which capacity is 1.4 Mb. It is labeled by
characters HD (high destiny).
The principle of operation of the device
will consist in reading numerical data with the help of the laser ray mirrored
from a surface of a disk. The digital recording on CD differs from record on a
diskette with high density.
3.4 Video card
Together with the monitor the video card
will derivate a video system of the PC. During existence of the PC some
standards of video cards were replaced: MDA (Monochrome); CGA (4 colours); EGA
(16 colours); VGA (256 colours); SVGA (16.7 mln colours). Key parameters of a video
card: screen resolution, colour permission (colour depth) and video expedition
(plane and three-dimensional).
3.5 Sound card
The sound card processes sounds, music and
speech. The sound is reproduced through the external stereo speakers connected
to a sound card. Key parameter of a sound card is the word length determining quantity
of bits per second.
4. Systems of the mother board
4.1 RAM (Random Access Memory)
RAM is a file of
the crystal cells, capable to store the data. There is a dynamic (DRAM) and
static (SRAM) memory.
Chips of a
dynamic memory use as the main RAM of a computer. Chips of static memory use as
an auxiliary memory (cache memory) intended for optimization of operation of
the processor.
4.2 Processor
The processor -
a main chip of the PC in which all calculations are made. The processor
consists of cells in which the data can vary. Internal cells of the processor
are named as registers.
Key parameters
of the processor: an operating voltage, a digit capacity, working clock rate,
coefficient of an internal clock multiplying, a size of the cache memory.
The processor is
connected to other devices of a computer groups of the explorers called as
buses. Main 3 buses: the address bus, the data bus, the bus of commands.
The address bus is
connected to it the processor for copying data from a cell in one of registers.
The data bus. On
this bus there is a copying data from the RAM in registers of the processor and
back.
The bus of
commands - commands act from the RAM, from areas where programs are stored.
4.3 Chip of ROM and system of BIOS
The chip of ROM
(permanently storage device) is capable to store long time the information,
even when the computer is switched off.
BIOS (Basic
Input Output System) – main assignment is to check up structure and working
capacity of the computer system and provides interaction with keyboard, monitor
and hard disk.
4.4 volatile memory
The data are
stored in a chip about floppy and hard disks, about the processor and some
other devices of the motherboard. Due to this chip the computer precisely
watches time and a calendar.
5. Peripheral devices of the PC
Peripheral devices of the PC are connected
to his interfaces and intended for execution of auxiliary operations. Due to
them the computer system gains flexibility and scalability.
5.1 Data input devices
Devices of input
of the sign data - the keyboard
Device of
command handle - the mouse and special manipulators: the trackball (installed
permanently, the ball is actuated by a palm), (pen mouse clone of a ball pen),
the infra-red mouse (wireless link with a system unit.).
Devices of input
of graphic data is scanners (are intended for input of the graphics information
on paper), data tablets (are intended for input artistic graphic information)
and digital cameras.
5.2 Data output devices
As the output device of the data,
in addition to the screen monitor, use printing stations - printers, permitting
to receive copies of documents on a paper or transparent carriers.
By a principle of operation
distinguish: matrix, laser, LED and ink-jet printers.
5.3 Data exchange devices
Modem - the device intended for
information interchange between remote computers. Key parameters of the modem:
productivity (bits/s), supported communications protocols and error
corrections, the bus interface (ISA or PCI).
6. Functions of operation system of a computer
Operation system
represents the complex of system and auxiliary resources. OS is a support for
program supports of higher level - applied and majority of the auxiliary applications.
Basic function of all operation
systems is intermediary. It consists in support of several sorts of interface:
user interface (between the user and soft-hardware of a
computer)
hardware-software interface (between program and hardware)
program interface (between different sorts software).
7. Software
Programs for work with the text.
Text editor is
the elementary program for input of the text.
Word-processor - allows not only to enter
and edit the text, but also to make it out.
Spreadsheets.
Spreadsheets are
used for work with figures. It is possible to enter numbers, formulas and
explaining text into cells of spreadsheets. Spreadsheets are capable to
transform numbers in graphs and diagrams.
Control systems of databases.
Databases name
the huge data files, organized in tabulated structures. The basic functions of
control systems by databases are: creation of empty structure of a DB, granting
of means of its filling or import of the data tables of other base, providing
of access to the data.
Graphic editors
Graphic editors
are big class of programs, made for creation and editing of images. There are
following categories of graphic editors: raster editors, vector editors and
software for creation and processing three-dimensional schedules.
Utilities
Utilities - can be named almost
any program occupied with socially useful activity. But more often as utilities
name the program on care of a computer
Archivers
Archivers are programs for data
compression.
Multimedia programs
Multimedia programs are
application which can play sound, video or games.
The list of the literature:
1. Materials on
the INTERNET:
1.1 http:
// www.kbsu.ru / ~ book (Shacukova L.Z. computer science. The Internet textbook).
1.2
http://mega.km.ru/
2. Computer
science, base rate, the textbook for high schools (Simonovich S.V, “Питер”
1999)
3. “Right
self-instruction manual of work on a computer” (Pravin O.V, 2002)
Оставьте свой комментарий
Авторизуйтесь, чтобы задавать вопросы.