What are the purpose of input and output devices?
- The purpose of an input device is to put information into a computer
- The purpose of an output device is a way to view or get information out of a computer
How can digital cameras be compared?
Digital cameras can be compared by:
- resolution
- zoom capabilities
- battery life
- extra features
How are touchscreens used?
Touchscreens use your touch to control a mouse or open an icon
What are the different forms of scanning?
The two types of scanning is:
- OCR = Optical Character Recognition
- OMR = Optical Mark Reading
How can barcode scanning be linked to databases?
The barcode links the product to a record in a database
What are the different types of monitor available?
- Liquid Crystal Display
- Organic Light Emitting Displays
How can printers be compared?
Printers can be compared by:
- Resolution of printout
- speed at which they print
How do you compare processors?
- Type of processor
- Number of processors
- Speed of processor
- amount of cache memory on the processor
What are the difference between main memory and backing storage?
- Main memory is used for storing data and programs when they are being used.
- Backing storage is used for saving programs and data when the computer is turned off.
What are the differences between RAM and ROM?
RAM:
-can be edited and changed
-used to store programs and data whilst the computer is turned on
ROM:
- holds data permanently
-Data that is in ROM cannot be changed, it can only be read
-ROM is used to store the bootstrap loader
What is the purpose of Cache memory and how can it improve system performance?
- Cache is used to store frequently used or recently used instructions and information
- Cache memory is faster memory as well as being closer to (or part of) the processor
