2. Then and Now
ENIAC (The Electronic Numerical Integrator And Calculator)
1946-2-14 Made In USA
3. Then and Now
1982 - ABC 80
Made in Sweden
Now – Macbook Pro
Made in China
4. What is a computer?
An electronic machine that can
be programmed to accept data
(input), and process it into
useful information (output).
Data is put in secondary
storage (storage) for
safekeeping or later use.
5. Computer Systems
Hardware
All the Physical parts of a Computer System (the
bits that you can see and touch)
Software
Software is a collection of programs that help the
computer hardware to work properly
7. Input Devices
Keyboard
Touch-Sensitive
Screen
Mouse
Microphone
Digital Camera
Digital Video Camera
Joystick
Scanner
The Physical Parts of a Computer SystemThe Physical Parts of a Computer System
which allows data to be entered into awhich allows data to be entered into a
Computer SystemComputer System
9. mouse
Lets you feed
instructions to the
computer by simply
pointing and
clicking in a
graphical
environment.
10. Scanner
A scanner is a device
that can read text or
illustrations printed
on paper and
translate the
information into a
form the computer
can use.
11. Output Devices
An output device is a device
which allows data to be
displayed or passed out of a
computer system
Printers
Monitor
Load speaker
Projector
13. Printer
a printer is a
peripheral which
produces a hard copy
of documents stored in
electronic form, usually
on physical print media
such as paper or
transparencies.
16. Random-Access Memory
Allows computers to
store and retain
information
Stores part of operating system
Stores part of the application programs
Stores your files as you work on them
17. Storage Devices
We require backing
storage to store
programs and files
Without backing
storage all our data
would be lost when we
turn the computer off
Backing Storage Media
Hard Disk
Floppy Disk
CD-ROM
DVD-ROM
USB Stick
18. Primary Storage – Hard disk
Size in
Gigabytes
Magnetic
technology
Fast access
A hard disk is a memory used mainly in computers.
19. Secondary Storage - CD/DVD
*-R - recordable
burn once
*-RW - rewritable
erase and burn
again
650 MB for a CD
4.7 GB for a DVD
8.5 GB for Dual
Layer DVDs
In-expensive
20. Flash memory – USB stick
Flash memory is a
non-volatile computer
memory that can be
electrically erased and
reprogrammed.
21. The Processor
The processor or
Central Processing Unit
is the brain of the
computer
The performance of the
processor is measured
in Giga Hertz (GHz)
We send programs to
the processor to get the
computer to do
something
22. Thank you!
We are computer hardware a
simple introduction
We hope you have some Harvest
Editor's Notes
Data The words, numbers, figures, sounds, and graphics that describe people, events, things, and ideas