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What is the difference between hardware and software?

Hardware is the physical parts of the system whereas the software is the logical parts of the system
and the instructions which actually tell the computer do something.

What is the difference between an input, output and storage device?

An input device…

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What is the testing of the systems lifecycle?

This is when the system is tested against the user requirements.

What is the implementation of the systems life cycle?

This is the part of the systems lifecycle where you actually implement the system. Direct
implementation is when you simply stop using…

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Analysis of documents means that you can find out exactly what information you need, however you
don't get any opinions.

What are systems flowcharts and data flow diagrams?

Systems flowcharts are diagrams that show how the elements of a system are associated with each
other and how they interact, they…

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What is the concept of prototyping?

Prototypes are a mockup of the a finished system and may only have some functioning parts. If at
various stages of the development process the client is show a prototype they can have an idea for
where the system is heading and they can…

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Operating systems provide a user interface and they protect the hardware from illegal access as well
as letting it communicate with the software in a safe way and provides a platform for applications to
run on/

Batch processing OS is used where all the inputs and outputs are similar so…

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OCR: a scanned image is broken down into letter sized chunks and each chunk is compared to a
letter pattern and then this makes it much faster than typing, however this has poor accuracy and
errors would have to be corrected manually.

OMR: usually papers are preprinted with spaces and…

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and this saves space on the system. Archiving data isn't used for retrieving a file if something goes
wrong it is used for storing little used or redundant data in case it is ever needed again.

What does a computer's processor contain?

A computer's processor contains a control unit which…

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What are the different types of primary memory and their uses?

RAM is random access memory and this means that data can be accessed immediately, the data is
volatile which means that it disappears as soon as the computer's power is turned off. The programs,
data and the operating system…

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Optical character recognition is a scanner which recognises patterns with characters and this uses up
less memory than an image.

Optical mark recognition is when there are preset places for markings to be made and each mark has
a value and this can be read by computers.

Scanners use reflection…

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rate. The bit rate which is needed can be reduced by making the file size smaller using compression

What are parity checks and check sums?

Parity checks are when you use either an odd or even parity and this is a method of error correction
because you can check…


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