computer systems

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computer systems revision cards
221100tj
Flashcards by 221100tj, updated more than 1 year ago
221100tj
Created by 221100tj almost 9 years ago
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Resource summary

Question Answer
standard computer system Input -> CPU -> Output | \/ Storage
DPA (Data Protection Act) -Personal data-> kept secure -Personal data-> kept accurate -Personal data-> specific purpose
Health and saftey at work act -Safe working environment -RSI-> Keyboards -Posture-> Chairs
copyright, design and patents act -Illegal to use software/other media without buying it -Purchasing of licenses
Importance of computer standards computers are embedded within many everyday task TRAVEL - traffic lights/sat navs/flight control systems DEVICES - mobile phones/cookers/microwaves NO COMPUTERS => Minor inconveinience (cannot boil kettle) Major saftey issues (traffic lights stop working)
reliability how reliable is a computer system?? measured by how often it is avaliable - 99% Mean Time Before Failure (MTBF) If reiability is essential (hospital patient monitoring systems) then HARDWARE REDUNDANCY is used to protect systems
Hardware Redundancy Have more than one critical component so they can be swapped
Data Loss Two copies of data stored so data can be resored if necessary - (previous versions at EMC)
Disaster Recovery Plan Companies using computers should have a DISASTER RECOVERY PLAN - fire/flood/theft .... An effective plan should enable them to get system back online without delay
Standards Computer systems = complex.... if every company did it their own way they wpuls be even more complex/internet wouldn't work etc
De Facto People/organisations work certain ways and over time this way of working becomes standard - using INDENTS when coding/adding comments to programme code
De Jure (LAW) Wireless signals - must be adhered to otherwise different devices will not be to connect
Proprietary (owned by organisation) ensure compatability within campanies products
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