COMPUTER HARDWARE

Then and NowENIAC (The Electronic Numerical Integrator And Calculator)

1946-2-14 Made In USA

Then and Now

1982 - ABC 80

Made in Sweden

Now – Macbook Pro

Made in China

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.

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

Computer work

Central Processing Unit

OutputInput Memory

Storage

Data

DataDataData

Input Devices

Keyboard Touch-Sensitive

Screen Mouse Microphone Digital Camera Digital Video Camera Joystick Scanner

The Physical Parts of a Computer System The Physical Parts of a Computer System which allows data to be entered into a which allows data to be entered into a Computer SystemComputer System

keyboard

Used to input textual information

to the computer.

mouse

Lets you feed instructions to the

computer by simply pointing and clicking in a

graphical environment.

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.

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

Monitor

Screen that displays what is going on in

the computer.

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.

Headphone

Used to deliver the

sounds.

Memory Devices

RAM

Random-Access Memory

Allows computers to store and retain

information

Stores part of operating systemStores part of the application programsStores your files as you work on them

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

Primary Storage – Hard disk Size in

Gigabytes Magnetic

technology Fast access

A hard disk is a memory used mainly in computers.

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

Flash memory – USB stick

Flash memory is a non-volatile computer

memory that can be electrically erased and

reprogrammed.

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

Thank you!

We are computer hardware a simple introduction

We hope you have some Harvest