The document discusses the basic components and functions of a computer system. It describes the Von Neumann model which includes hardware, software, a central processing unit, memory, and input/output devices. The hardware components that can be physically touched like a laptop, keyboard, and screen are explained. Common input devices that supply data to the computer like keyboards, mice, and scanners are also defined. The document concludes by detailing various output devices that output data from the computer such as display screens, printers, and plotters.

1. INFORMATION TECHNOLOGY

3. VON NEUMANN MODEL
A COMPUTER SYSTEM IS MADE OF:
HARDWARE
+
SOFTWARE
INPUT RAM ROM OUTPUT
DEVICES DEVICES
CONTROL
CPU UNIT
+ ALU
MASS
STORAGE

4. HARDWARE
A LAPTOP SCREEN
KEYBOAR
D
HARDWARE IS WHAT WE CAN TOUCH AS FOR
EXAMPLE THE MONITOR,THE KEYBOARD, THE
MOUSE, THE PRINTER, THE WEBCAM……

5. KEYBOARDS
SPACEBA ARROW
R S
A computer keyboard is like a typewriter
keyboard. It has the alphabet letters,
the numbers, the punctuation and extra
keys for control purposes.
FLEXIBLE
KEYBOARD

6. INPUT DEVICES
INPUT DEVICES SUPPLY DATA TO THE
COMPUTER. THEY ARE:
- KEYBOARD
- MOUSE
- JOYSTICK
- SCANNER
- SCANNING DEVICE
- DIGITIZING TABLET
- TOUCH-SENSITIVE SCREEN
- MICROPHONE

7. TYPES OF COMPUTER
SUPERCOMPUT
ER
MAINFRAME PERSONAL
COMPUTER
MINICOMPUTER

8. GAME CONTROLLER
Computer games are controlled by
games paddles o joysticks; both are
based on
small levers which can be moved in
various directions.

9. OUTPUT
DEVICES
OUTPUT DEVICES OUTPUT DATA FROM
THE COMPUTER.
THE MOST IMPORTANT ARE:
• DISPLAY SCREEN
• VDU (VISUAL DISPLAY UNIT
• PRINTERS (LASER PRINTER, INK-
JET PRINTER)
• PLOTTER (they are used to produce
drawings, diagrams and other types
of graphical output)

10. MASS STORAGE
CD ROM
CD R
Floppy disk CD RW
DVD
disk
Zip disk
Magnetic tape
Hard disk

11. MOTHERBOARD
It is the central printed circuit board.
It holds a lot of the crucial components
of the system.
It provides connectors for other
peripherals.

12. WHAT IS ROM?
ROM IS THE READ ONLY MEMORY.
DATA SAVED WITH ROM CAN’T BE CHANGED.
IT IS USED FOR OPERATING SYSTEMS, CD-ROMS AND
OTHER PROGRAMS.

13. CPU +
CLOCK
CPU can be considered the brain of the
computer. It performs the calculations, runs
the programs and generally controls what
the computer does.

14. WHAT IS RAM?
IT IS THE RANDOM ACCESS MEMORY.
IT’S THE TYPE OF MEMORY WE USE TO SAVE OUR WORK
TO THE HARD DISK OR A MEMORY KEY.
RANDOM – NOT SEQUENTIAL it is a volatile memory, not
permanent and the information
stored in it is lost when the
computer is turned off.

15. NETWORK HUB
PEN DRIVE
USB MEMORY
STICK
WIRELESS HUB

16. TECHNOLOGY
COMMON WORDS COMMON VERBS
• • TO PLUG IN=COLLEGARE
TOOLBAR
• • TO TURN ON/OFF
MENU
• • TO DELETE
ICON
• • TO STORE/ TO SAVE
CURSOR
• • TO COPY
MEMORY
• • TO HIGHLIGHT
BUG/VIRUS
• • TO TRANSFER
A DOCUMENT
• • TO DRAG
A BACK-UP COPY
• • TO CUT
DATABASE
• • TO PRINT
SPEAKER
• • TO SELECT
KEYBOARD
• • TO SURF
PEN DRIVE
• • TO CONNECT
CPU
• • TO CHAT
ROM=READ ONLY MEMORY
• • TO RECEIVE
RAM=RANDOM ACCESS MEMRY
• • TO SEND
APPLICATION
• • TO DOWNLOAD
FILE
• • TO LOG IN/OUT
FOLDER
• • TO MOVE A FILE
FONT
• • TO INSTALL
WWW= WORLD WIDE WEB
• LAN= LOCAL AREA NETWORK