Computer Science A-Level

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Denary Number System
It has 10 digits and is also known as the decimal number system or the base 10 system.
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Binary Number System
It has 2 digits (0 or 1) and is also known as the base 2 system.
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Binary Code
It is a number made up of 0s and 1s. Binary codes can be used to represent numbers and text.
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Hexadecimal System
Hex is a base 16 system. It has 16 digits to represent values from 0 to F and it is used as a shorthand for binary.
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HTML
Hypertext markup language is used to develop web pages. HTML code often uses hexadecimal numbers to represent colours.
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MAC Addresses
A media access control address is a number that uniquely identifies a device on a network. It is usually a 48-bit number which is represented as a hexadecimal number.
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Assembly Code
It is a programming language in which programmers use hex values.
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BCD
Binary coded decimal is a system for representing single digit positive numbers (0-9). It is an alternative method to representing integers as a group of bits in a byte. It uses 4 bits to represent each digit.
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ASCII Codes
The American Standard Code for Information Interchange is an internationally agreed standard for representing characters as binary codes. They are 7-bit codes (the most significant bit is 0).
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Unicode
Unicode is used to represent any possible text in code form including all languages. The first 128 characters in Unicode are the ASCII codes. Each character in Unicode (binary code) is referred to as code-point.
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Other cards in this set

Card 2

Front

It has 2 digits (0 or 1) and is also known as the base 2 system.

Back

Binary Number System

Card 3

Front

It is a number made up of 0s and 1s. Binary codes can be used to represent numbers and text.

Back

Preview of the back of card 3

Card 4

Front

Hex is a base 16 system. It has 16 digits to represent values from 0 to F and it is used as a shorthand for binary.

Back

Preview of the back of card 4

Card 5

Front

Hypertext markup language is used to develop web pages. HTML code often uses hexadecimal numbers to represent colours.

Back

Preview of the back of card 5
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