Friday, March 27, 2015

Computer Anatomy (Monitor, Keyboard, Mouse, CPU, Hard Disk, Motherboard, RAM, ROM, Ports) , Data Storage History and Geek Speak (program)


Monitor
LCD screen displays text and images made up to individual dots of color called pixel.

Keyboard

contains microprocessor that detects which key has been pressed and sends a signal to the control processing unit.

Mouse
As the mouse is moved it sends co-ordinates to the computer, which moves the cursor on the screen.

CPU
the central processing unit is the brains of the
computer and carries out calculations and instructions.

Motherboard
This is the main circuit board.it connects the computer's key components and passes on instructions.

Ports
External devices such as flash sticks (pen drives), printers, scanners, digital music player, digital camera and

smartphones can be plugged in.

Hard disk
This magnetic disk is located within the main body of the computer and stores the computer's programs and data.

ROM
Read Only memory. This holds permanent data that remains ever when the computer is switched off.

RAM
Random Access Memory. This holds data temporarily. The data is lost when the computer is switched off, unless user has saved it.

1995
The first electronic computer used so much power that all the lights in a nearby town dimmed every time it was

switched on. It weighed in at about 30 tonnes.

2008
MacBook Air
This ultra-thin laptop computer fits in a bag and weighs just 1.4kg (3lb).


Data storage (History)

1940s
punched cards

1950s

magnetic tape &
Hard disk

1970
floppy disks

1990s
rewritable disks

2000s
DVDs &
USB flash sticks


Geek speak (Program)

Programs are sets of instructions that tell a computer what to do, written in a code called a programming language.

There are lots of languages, all designed to suit different types of programs.

Ads
Named after Ada, Countess of Lovelace, a pioneer of programming.

BASIC
Beginners All-purpose Symbolic Instruction Code.

c#
pronounced C-sharp, it gets its name from music

COBOL
Common Business Oriented Language

FORTRAN 
FORmula TRANslation

JAVA
Named after Java coffee, because inventors thought their language just as strong and reach!

PASCAL
Named after French mathematician and writer Blaise Pascal


WEIRD OR WHAT?


The first computer "bug" was actually a moth that got trapped inside a computer at Harvard University, USA, in 1945. Perhaps it was looking for a "byte" to eat!