Computing Rev

  • Created by: roshan231
  • Created on: 08-01-19 19:10
ALU
arthritmic and logic unit: Where the instructions are copied to for calculations and logical decisions
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CU
Control unit: Resposible for decoding instructions
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Accumulator
A Register which stores any calculations done by the ALU
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Program counter
Keeps track of the memory location for the next instruction to be dealt with
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Memory address register
Stores the location in memory to be used: Where to locate data that needs to be fetched
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Memory data register
Store any data fetched from memory. or data being transferred to memory
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Fetch
Program counter copied to mar, CU locates and fetches
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Decode
CU decodes in the MDR
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Execute
The instruction is executed; e.g data is loaded to memory data register or a calculation is copies to the ALU to be solved
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Secondary Storage
Long term non-volatile storage devices such as Hard disk, optical etc
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ROM
Non volitile very small storage, keeps things like the bios. user and program cannot change the rom
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Cloud Advantages;
1.Can be backed up safely 2.Cost- no need for a actual device
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Cloud disadvantages;
1.Internet connection required or no access to files 2.may not have as much storage as you need for a real device 3. possible security threat
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RAM
Fast memory transers, is volitile, more ram more proformance
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embedded systems
Systems thats cannot be altered that are programmed to do one specific task
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What is a LAN?
Local Area network based in a small geographical area
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What is a WAN?
Wide Area Network based in a large geographical area such as the internet
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How does packet switching work?
1. TCP splits packets 2.IP The different segments take different routes to the destination. 3.TCP re-assembles packet at destination in correct order
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TCP
Internet protocol which organises How packets work
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IP Address
Every decive has a IP address. it helps for when packets are routed using the ip on a wide area network
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MAC
This address is used to route frames on a local area network
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What are the layers in networking protocols used for?
They break the whole complex situation into diferent layers wich can be individually worked on and can interact with each other
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:Name the layers and what they do: A_T_I_N
Layer 1; applications-Making sure data is in an appropriate format
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Layer 2
Transport: establishing a connection as well as agreeing the details for the format of the packets
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Layer 3
Internet; establishing a path from sender to reciver across different networks
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Layer 4
Network- converting the data to electrical signals to the local physical network
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Data Protect Act 1988
This act protects all your private data so only you can decide who does and doesn't have access to it
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Computer misuse act 1990
"hacking" or gaining access of unauthorized files is against this law and you can be put in jail for this
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Copyright Design and Patents Act 1988
Selling of making copies and giving away software that doesn't belong to you is forbidden and you can be prosecuted this is also known as piracy
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Other cards in this set

Card 2

Front

Control unit: Resposible for decoding instructions

Back

CU

Card 3

Front

A Register which stores any calculations done by the ALU

Back

Preview of the back of card 3

Card 4

Front

Keeps track of the memory location for the next instruction to be dealt with

Back

Preview of the back of card 4

Card 5

Front

Stores the location in memory to be used: Where to locate data that needs to be fetched

Back

Preview of the back of card 5
View more cards

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