B061...

B061...

1. Input

   • Examples: Keyboard,mouse,touchpad,joystick,concept keyboard,touchscreen, scanner, graphics tablet, microphone, webcam, barcode reader/scanner,optical mark reader, optical character recognition, magnetic stripe reader, sensors etc ....
   • Definition: entering data or instructions into a computer.

2. Output

   • Examples: monitor,printer - laser jet, printer - inkjet, plotter, touchscreen, speakers , headphones/earphones, Actuator etc...
   • Definition: When the results of processing are produced.

3. Rom

   • Uses; When first switching on computer it needs the few instructions stored in the ROM to get started.etc...
   • Definition; Is used to store data or instructions that do not need to be changed such as when the computer is first switched on the CPU doesnt know what to do so there are a few instructions stored in ROM that can tell it where and how to find the instructions to get started.
   • Other info... It is a type of memory from which data can be read but which cannot usually be changed or erased such as data the computer needs starting up. ( It is non-volatile )
   • Rom: Read Only Memory

4. Ram

   • Definition: It doesn't keep any data if its power supply is switched off. But usually data in RAM can be accessed quickly wherever it happens to be stored. It is used to store data which you are currently using.
   • Other info... It makes up the bulk of the memory found in the computer systems.
   • Uses: What ever you are currently using the data is stored on RAM and once you get off it the data will be lost unless you save it.etc...
   • Ram: Random Access Memory

5. Types of Computers

   • Examples: Supercomputer, Mainframe computer,Embedded computer, Personal computer.
     • Definitions of super computer: These cost over millions of pounds and there will only be one type of each one. These have a specific use.They generate lots of heat. This is why they have to bee in a specifically designed room with air conditioning systems. They have their own back up electricity generator so they can work in a power failure. They have a lot of cables to cover these false floors and ceilings are used. For example they are used in universities for big scientific reasear ch.
     • Definition of Mainframe computer; They cost less than super computers.These store lots of data for big companies. the are large and powerful computers. They can ddo lots of different tasks for lots of different people all at once. For example: Police, banks , airlines all use mainframe computers etc.
     • Definition of Embedded computer: The main purpose of this is to control something. They have one chip for the whole computer that contains everything the term for this is ' micro controller '.Examples of embedded computer are : Telephones, Television, Cameras, Washing machine, Microwave, Cookers, Dishwasher, Cars etc...
     • Definition of Personal computer: This is what you use for your own personal use and you can do anything to it. They are not very expensive. They are very powerful and can store lots of data from 120GB to 1TB. They can be found in homes and offices. For examples: Laptops, Iphone, Tablets etc...
       • Examples: Desktop Computer, Laptop, Netbook, Tablets, PDA.
         • Definition of Desktop Computer: It is not portable. Its designed to fit on an individual workspace/desktop.
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         • Definition of PDA: It stands for Personal Digital Assistant. It is a handheld computer. Its a personal organizer but also provides email and internet access.
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         • Definition of Netbook: These are very small in size and are made tro hold in one hand.
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         • Definition of Laptop: Is a portable computer with a slightly smaller keyboard than the standard keyboard.
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         • Definition of Tablet: This is a thin, flat device which is touchscreen. The screen view can be changed into landscape and potrait just by tilting it, It uses a stylus which is a digital pen or finger tip as a primary input.
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