Computer System Servicing Lesson 2

5. Introduction to Computer
Systems
A computer is an electronic device that
helps people perform different tasks.

6. It accepts information (in the form of digitized
data) and manipulates it for some result based on a
program or sequence of instructions on how the
data is to be processed.
Introduction to Computer
Systems

7. Four (4) Types of Computer
The four basic types ofcomputers are:
1. Supercomputer
2. Mainframe computer
3. Minicomputer
4. Microcomputer
Since the advent of the first computer different types and sizes of
computers are offering different services. Computers can be as big as
occupying a large building and as small as a laptop or a microcontroller in
systems.

8. The most powerful computers in
terms of performance and data
processing are the
supercomputers. These are
specialized and task specific
computers used by large
organizations.
Four(4) Types of Computer
1. Supercomputer

9. These computers are used for research and exploration purposes, like
NASA uses supercomputers for launching space shuttles, controlling
themand for space explorationpurpose.
USESOF SUPERCOMPUTER:
 SpaceExploration
 EarthquakeStudies
 WeatherForecasting
 NuclearWeaponsTesting
Supercomputer
Four(4) Types of Computer

10. Although mainframesarenot as powerful
as supercomputers,certainlythey are
quiteexpensive.In fact,many largefirms
& governmentorganizationsuse
Mainframesto run their business
operations.
2. MainframeComputer
Four(4) Types of Computer

11. The Mainframe computers can be
accommodated in large air-conditioned rooms
because of its size. On the other hand, super-
computers are the fastest computers with large
data storage capacity.
MainframeComputer
Four(4) Types of Computer

12. Minicomputers are used by small businesses &
firms. Minicomputers are also called midrange
computers. These are small machines and can
be accommodated on a disk with not the same
processing and data storage capabilities as
super-computersandmainframes.
3. Mini Computer
Four(4) Types of Computer

13. Desktop computers, laptops, personal digital
assistant (PDA), tablets & smartphones are all types
of microcomputers. The micro-computers are widely
used & the fastestgrowing computers.
4. MicroComputer
Four(4) Types of Computer

14. These computers are the cheapest among the other three types of
computers. The micro-computers are specially designed for general usage like
entertainment, education, and work purposes. Well-known manufacturers of
micro-computers are Dell, Apple, Samsung,Sony, andToshiba.
MicroComputer
Four(4) Types of Computer

15. THE 3 FUNDAMENTAL ELEMENTS OF THE
COMPUTER
- acts like the center or core,
processing the data and
information it receives from
input devices.
1. SYSTEM UNIT

16. THE 3 FUNDAMENTAL ELEMENTS OF THE COMPUTER
- any hardware device that sends data to a computer,
allowing you tointeract with and controlthe computer.
The most commonly used
or primary input devices on a
computerarethe: Keyboard andmouse
2. INPUTDEVICES

17. THE3FUNDAMENTALELEMENTSOF THECOMPUTER
However, there are dozens of other devices that can also be used to input data into
the computer.
Microphone Hand-held scanner
Flatbed scanner
Web camera
Keyboard
Joystick
Mouse

18. THE 3FUNDAMENTALELEMENTSOFTHECOMPUTER
2. OUTPUT DEVICE
any peripheral that receives data from a computer, usually for display,
projection,or physicalreproduction.

20. Basic Parts of the System Unit
1. System Case
2. Motherboard
3. Central ProcessingUnit (CPU)
4. Random AccessMemory (RAM)
5. Power Supply
6. Hard disk
7. CD-ROM drive
8. Expansion Slot

21. 2. System Case
A computer case also known as a computer chassis,
tower, system unit, cabinet, base unit or simply case
and sometimes incorrectly referred to as the "CPU"
or "hard drive", is the enclosure that contains most
of the components of a computer.

22. Two Types of System Case
1. Tower (Full, Mid, Mini) –
designed to sit vertically
2. Desktop (Standard, Slimline) –
designed to sit horizontally

23. 3. Motherboard
A printed circuit board containing the principal components of a computer or
other device, withconnectors into whichother circuit boards can be slotted.
It holds and allows communication between many of the crucial electronic
components of a system such as the central processing unit (CPU) and memory, and
provides connectors for other peripherals.

24. 4. Central Processing Unit (CPU)
A CPU is the electronic circuitry within
a computer that carries out the
instructions of a computer program by
performing the basic arithmetic, logical,
control and input/output (I/O)
operations specifiedbythe instructions.

25. 5. Random Access Memory (RAM)
RAM is the physical hardware inside a computer that temporarily
stores data, serving as the computer's "working" memory. Additional
RAM allows a computer to work with more information at the same
time, which usually has a considerable effect on total system
performance.

26. 6. Power Supply
A power supply is an electronic device that supplies electric energy to an
electrical load. The primary function of a power supply is to convert one form of
electrical energy to another and, as a result, power supplies are sometimes
referred to aselectric power converters.

27. 7. Hard Disk Drive (HDD)
The hard diskdrive is themain, and usuallylargest, data storage
hardware device in a computer. The operating system, software
titles,and most other filesare stored in the hard disk drive.
The hard drive is sometimes referred to as the "C drive" due to
the fact that Microsoft Windows, by default, designates the "C"
drive letter to the primary partition on the primary hard drive in
a computer.

28. SATA
IDE
8. Old and Newer Hard drive
SATA -Serial Advance TechnologyAttachment
(new)
IDE– Integrated Drive Electronics (old)

29. 9. CD ROMDrive
A CD-ROM is a pre-pressed optical compact disc which contains
data. The name is an acronym which stands for "Compact Disc
Read-Only Memory". Computers can read CD-ROMs, but cannot
writeto CD-ROMswhichare not writable or erasable.
CD – Compact Disk, DVD – DigitalVersatile Disk

30. 10. Expansion Slot
The expansion slot (also expansion board,
adapter card or accessory card) in computing is a
printed circuit board that can be inserted into an
electrical connector, or expansion slot on a
computer motherboard, backplane or riser card
to add functionality to a computer system via the
expansionbus.
This is where you install the video card, sound
card, LAN card,

31. to learn,
no one can help you.
If you are determined
to learn,
no one can stop you”.
Zig Ziglar

32. Thank
You…