A system of numbers using only two digits, 0 and 1 (also called the base-2 system).
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Denary
A system of numbers using 10 digits, 0 and 1-9 (also called the base-10 system).
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Hexadecimal
The base-16 number 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 or half a byte.
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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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Character Set
The characters available to a computer.
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ASCII (American Standard Code for Information Interchange)
7-bit system to code the character set of a computer system.
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Unicode
Up to 32-bit system to code the character set of a computer (usually 16-bit or 32-bit versions).
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Pixel
The smallest element of an image. Pixels are the dots that make the image on screen.
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Colour Depth (or Bit Depth)
The number of bits used for each pixel or dot. The more bits, the more colours that can be represented.
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Resolution
The number of pixels or dots per unit, for example ppi (pixels per inch), often referred to as dpi (dots per inch).
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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. This must contain the height and width in pixels and the colour depth in bpp (bits per pixel).
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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, measured in Hz (100 Hz is 100 samples per second).
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Bit Rate
The bit rate is the space available for each sample, measured in kilobits per second (kbits/s). (128 kbits/s is 128 kilobits per second of sampled sound).
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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 op code 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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Op Code
The part of the instruction that tells the CPU what to do.
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Operand
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
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Front
A system of numbers using 10 digits, 0 and 1-9 (also called the base-10 system).
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