This document provides a history of computers from early models like ENIAC built in 1946 to modern devices like the Macbook Pro. It describes the basic components of computer hardware, including the central processing unit, memory, storage, and input/output devices. Over time, computers have become more compact and powerful, exemplified by the transition from the ABC 80 desktop computer of 1982 to today's portable laptops. The core components of computers - CPU, memory, storage and I/O - remain the same, although the specific technologies have advanced greatly.

1. COMPUTER
HARDWARE

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

6. Computer work
Central Processing Unit
OutputInput Memory
Storage
Data
Data
Data
Data

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

8. keyboard
 Used to input
textual information
to the computer.

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

12. Monitor
 Screen that displays
what is going on in
the computer.

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.

14. Headphone
Used to
deliver the
sounds.

15. Memory Devices
 RAM

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