Representation of data in computer systems keywords

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denary
system of numbers using ten digits, 0 and 1-9, also called the base-10 system
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binary
system of numbers using two digits, 0 and 1, also called the base-2 system
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bit
binary digit 1 or 0
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byte
8 bits
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nibble
4 bits
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kilobyte
1024 bytes
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megabyte
1024 kilobytes
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gigabyte
1024 megabytes
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terabyte
1024 gigabytes
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overflow
when a number becomes too large to fit into the number of bits allocated it is said to overflow and some bits are lost leaving an incorrect value
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hexadecimal
base 16 number system
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character set
characters available to a computer
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ASCII
American Standard Code for Information Interchange, system to code the character set of a computer
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unicode
up to 32 bit system to code the character set of a computer
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pixel
smallest element of an image, pixels are the dots that make the image on screen
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colour depth
number of bits used for each pixel, the more bits the more colours that can be represented
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resolution
number of pixels per unit
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metadata
information about the image data that allows the computer to recreate the image from the binary data in the file, must contain the height and width and colour depth
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raster
graphics format consisting of a matrix of dots
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analogue
refers to continuously changing values
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sample rate
the number of times the sound is sampled per second
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bit rate
the space available for each sample, measured in kilobits per second
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address
a location in main memory used to store data or instructions
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decode
an instruction is decoded by the CPU into two parts- the operator and the operand
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register
special fast access part of the CPU that stores data in use by the CPU
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program counter
a register in the CPU that keeps the address of the next instruction
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operator
this is the part of the instruction that tells the CPU what to do
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operand
this is the part of the instruction that tells the CPU what to apply the operation to
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accumulator
a register in the CPU that stores data currently being used by the CPU
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Other cards in this set

Card 2

Front

system of numbers using two digits, 0 and 1, also called the base-2 system

Back

binary

Card 3

Front

binary digit 1 or 0

Back

Preview of the back of card 3

Card 4

Front

8 bits

Back

Preview of the back of card 4

Card 5

Front

4 bits

Back

Preview of the back of card 5
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