computing system lesson objective: understand what is meant by a ‘computer system’ learning...
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What is a computer system? A computer system is made up of hardware and software. Hardware is any physical component that makes up the computer. Software is any program that runs on the computer.TRANSCRIPT
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Computing system Lesson Objective:
Understand what is meant by a ‘computer system’
Learning Outcome:Define the key words and give a brief explanation for each.
Keywords: Input, output, storage, processing, DAC ADC, reliability, availability, MTBF, Hardware redundancy, RAID, disaster recovery.
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What is a computer system? A computer system is made up of
hardware and software. Hardware is any physical component that makes up the computer. Software is any program that runs on the computer.
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A computer system ...
ProcessInput Output
Storage
e.g. Keyboard, mouse
e.g. Monitor, speakers
e.g. Hard drive, RAM
???
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Which has a computer system?Identify the input & output devices. What information is being processed?
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Digital and Analogue (Real World)
Digital data is stored as 0’s and 1’s
Digital information occurs in steps
Analogue information makes gradual changes
Analogue data can be stored as writing, sound, …etc.
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Digital to Analogue Converter
Digital and Analogue signals
ComputerNo entry to Analogue
Analogue Signals
Analogue SignalsAnalogue
to Digital Converter
DIGITAL ONLY!
Input Output
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Reliability Many computer systems need a high
degree of reliability.For example:
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Protecting against failures Redundancy
Disaster recovery
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Redundancy Redundancy means having more than
one device in case of breakdown.
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Redundancy Example RAID storage
RAID: http://www.youtube.com/watch?v=eE7Bfw9lFfs
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Disaster recovery Some companies fully rely on computer
systems (e.g. web commerce)
They have plans for what to do if major systems fail
Companies often have their own procedures or they employ other companies who can do it.
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Example of disaster recovery: