GCSE/IGCSE and AS/A Level ICT-Applied ICT

A bit is a binary digit, taking a logical value of either “1″ or “0″.

Binary digits are a basic unit of information storage and communication in digital computing and digital information theory.

There is no standard but a byte most often consists of eight bits.

1 byte = 8 bits

1 kilobyte = 1024 bytes

1 megabyte = 1024 kilobytes

1 gigabyte = 1024 megabytes

ASCII

ASCII stands for American Standard Code for Information Interchange.

It is a coding standard that can be used for interchanging information, if the information is expressed mainly by the written form of English words.

ASCII codes represent text in computers.

Each number represents a character and aach ASCII character occupies just one byte.

For example letter A can be represented by 1 byte or 8 bits like: 01000001

So when you type letter A actually computer understands it as “01000001″.

For example the word IGCSE would take 5 bytes of memory to store.

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