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General theory notes

Hardware is any physical part of a computer (it is a group of machines)
Hardware is made up of The CPU and Main memory, Input Devices, Output Devices, Storage Devices
Main Memory stores programmes and data for processing
CPU stands for central prpcessing unit
Input Device These devices read incoming data and pass it on to the CPU
Output Devices These accept information from the CPU and display the results for the user
Storage Devices these keep information and instructions in the computer so that they can be used again
Mouse Is Used to select text, insert text or an icon on a page by clicking and dragging
Keyboard Used to type words on a page
Bar code They read or scan the zebra like bars that you see on most products
Reader/Wand They are used in supermarkets where the bar code on the item is scanned and the products information is read, e.g. its price.
Reader or Scanner This scanner is often connected to a POS or point of sale terminal called an electronic cash register
Point of sale Terminal They are used to collect information on a product by scanning a bar code
Digitiser Used for drawing illustrations or creating graphics/pictures on a page.
Camera/Tape Recorder Used to input voice or visual pictures on to your computer
VDE/Voice Data Entry It can accept human speech and convert it to the spoken word onto your screen.
OCR/Optical Character reader (optical scanner) They are devices that scan the document and turn it into readable form your screen
MICR/Magnetic Ink Character Reader They are used when documents, contain magnetic digits that contain information
OMR/Optical mark Recognition/Reader The computer will pick up marks, e.g. pencil marks on a sheet to collect information
Touch Screen It is a special screen which allows you to carry out a task by touching on the screen
Light Pen or Stylus You can use a special pen to touch the touch screen
Monitor/VDU or visual Dusplay unit: This is the screen that you look at: it contains a soft copy of your information.
Flat screen Technologys; Portable computers like laotops, notebooks, and PDA's
Printer They are used to print a hard copy of your information
Impact printer They are slower, noiser and often break down, they are more inexpensive
Plotter They are printing devices that produce a high quality image for drawings
Audio Responce Used to provied verbal responces using a voice simulater or pre-recorded messages
Microfiche/film When large amounts of information needs to be stored
Speaker Sends out audio/sound
Digital Projector Displays the monitors image on a large screen/wall
Hard Disc This is a permanent disc inside the tower of your computer that you can store information to, called the C drive.
Byte This is a letter or a symbol, A kilobyte is 1024 bytes. A megabyte is 1 million bytes. A gigabyte is 1 Billion bytes.
Speed The speed of this memory is measured in nanoseconds or billionths of a second. We use the symbol MHz or megahertz when describing speed.
MIPS Millions of instructions per second, or the speed and memory size together.
Ergonomics This relates to any Health and Safety issues relating to PC Use.
Created by: JackWalsh10



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