INFORMATION SHEET 1.
2-6
Computer Hardware
Learning Objective:
After reading this INFORMATION SHEET, YOU MUST be able to familiarize Computer hardware
and enumerate its functions and uses.
HARDWARE Refers to the tangible (things you can touch) components of a
computer system. Hardware components are further divided into three groups
namely
Input Devices
Output devices
System Unit
INPUT DEVICES. Performs the two most basic computing tasks: issuing
commands and entering data. Common input devices are the following:
- Keyboard is a standard input device of most computers
MOUSE
KEYBOARD
- Mouse is a hand-clicked device used for pointing. The modern
mouse uses a ball for movement and has two to three buttons.
- Trackball is like a stationary, upside down mouse.
- Joystick is an input device which is commonly used for computer
games
JOYSTICK
LIGHT PEN
- Light pen a device used to draw, write, or issue commands when it touches
a specially designed screen.
OUTPUT DEVICES. After processing the data fed into computer with the
use of input devices, the information must now be outputted in a form
understood by human beings. Output devices are classified according to the
output they can produce. An output which you can hold in your hand is
called hard copy. Output types such as audio and video are referred to as
soft copy. The following are output devices used.
- Printer - an output device that produces text and graphics on paper
- Video Monitors Th
NON-IMPACT PRINTER
IMPACT PRINTER
The monitor, or display is used to provide soft copy output.
monitors are either monochrome or colored
Video
VIDEO MONITOR
SPEAKERS
Speakers- play sounds transmitted as electrical signals from the sound
card.
Modem a device that sends and receives data over telephone lines to
and from computers.
Modem
THE SYSTEM UNIT. The system unit is the part of the computer
which is responsible for accepting and processing the data brought in by the
input devices. It also responsible for passing the resulting information to
the users via the output devices.
The Main Circuit Board - Also called the "system
board," is the main printed circuit board in an
electronic device, which contains sockets that accept
additional boards. In a personal computer, the
motherboard contains the bus, CPU and coprocessor
MAIN CIRCUIT
sockets, memory sockets, keyboard controller and supporting chips.
BOARD
Port is a connection from the main circuit board to a peripheral device
such as a keyboard, a printer or a video monitor. The port is also called
an interface. Ports are arranged at the rear of the main circuit board.
Expansion Slot is a receptacle inside a computer or other electronic
system that accepts printed circuit boards.
The Bus. is responsible for transporting electronic signals from place to
place or specific predefined routes.
The CPU The CPU is the computers processor, controller and storage
device
Case and Power Supply is also known as the system unit, the case or
system cabinet is the box that houses the processor chip (CPU), the
memory chips, and the motherboard with power supply, as drive, and
CD-ROM or DVD drive. It include a power supply unit and a fan to keep
the circuitry free from overheating.
POWER SUPPLY
Clock it synchronizes the operation of all parts of the PC, and provides
the basic timing signal for the CPU.
Memory The memory in a computer system is of two fundamental
types: The main memory and the secondary memory .
Memory cards
RAM-(Random Access Memory) is a group of memory chips, typically of
the dynamic RAM (DRAM) type, which function as the computer's
primary workspace. The "random" in RAM means that the contents of
each byte of storage in the chip can be directly accessed without regard
to the bytes before or after it.
BIOS The BIOS (Basic Input / Output System) is a ROM chip that
provide.
CMOS stores the configuration of the PC (example the password, disk
type, amount of memory installed, current time and data). CMOS stands
for Complimentary Metal-Oxide Semiconductor.
Secondary Memory Secondary memory is where programs and data
are kept for a long term basis. Common secondary storage devices are
the floppy disk and hard disk, Compact disk or CD.
FLOPPY DISK (or diskette) is as flimsy as a sheet of paper but is
protected by a sturdy, square jacket that encases it. It has a low
capacity, and is very, very slow compared to other storage devices.
FLOPPY DISK
PROCESSOR CHIP
FLOPPY DRIVE
HARD-DISK DRIVE A hard-disk drive is a storage device that store
billons of characters of data on a nonremoveable disk platter.
HARD- DISK DRIVE
CD-ROM/DVD Drive
CD-ROM/DVD DRIVE A CD (computer disk) drive, or its more recent
variant, a DVD (digital video disk, is a storage device that use laser
technology to read data from optical disks.
VIDEO CARD is a board that is plugged into a period computer to give
it display capabilities. It connects the processors output information
into a video signal that can be sent through a cable to the monitor.
SOUND CARD - enhances the computers sound generating capabilities
by allowing sound to be output through speakers.
MODEM A modem is a device that sends and receives data over
telephone lines to and from computers.
VIDEO CARD
SOUND CARD
MODEM
IDE CABLE / FLOPPY CABLES
POWER CABLES it supplies power from the power supply to the drive. The
power cables are red, yellow and black. The yellow wire furnishes 12 volts of
power, the red wire furnishes 5 volts of power, the two black wire are ground
wire for each.
IDE AND FLOPPY DISK RIBBON CABLE IDE stands for Integrate Device
Electronics. It shows how to connect an IDE cable to two devices namely the
top device (master) and the bottom device (slave).
