Unit 1 :Data representation

Front

bit

Back

The basic computing element that is either 0 or 1, and is formed from the words Binary digit.

Front

binary number system

Back

A number system based on 2 and can only use the values 0 and 1.

Front

hexadecimal number system

Back

A number system based on the value 16 which uses denary digits 0 to 9 and letters A to F.

Front

error code

Back

An error message generated by the computer.

Front

MAC address

Back

Stands for Media Access Control, this address (given in hexadecimal) uniquely identifies a device on the internet; it takes the form: NN-NN-NN-DD-DD-DD, where NN-NN-NN is the manufacturer code and DD-DD-DD is the device code.

Front

IP address

Back

Internet Protocol identified either as IPv4 or IPv6; it gives a unique address to each device connected to a network identifying their location.

Front

HTML

Back

HyperText Mark-up Language is used in the design of web pages and to write, for example, http(s) protocols; in the context of this chapter, colours used in web pages are assigned a hexadecimal code based on red, green and blue colours.

Front

overflow error

Back

The result of carrying out a calculation that produces a value that is too large for the computer’s allocated word size (8-bit, 16-bit, 32-bit, and so on).

Front

logical shift

Back

An operation that shifts bits to the left or right in a register; any bits shifted out of a register (left or right) are replaced with zeroes.

Front

two’s complement

Back

A method of representing negative numbers in binary; when applied to an 8-bit system, the left-most bit (most significant bit) is given the value –128.