Topics

Topics

1. Computer Hardware

   • Input output
   • CPU
   • ROM and RAM

2. Computer System

   • Reliability
   • Standards
   • Ethical and Legal

3. Data In Computer Systems

   • Binary and Denary
     • Binary is made up of 0's and 1's ON or OFF switches
     • Denary is normal numbers, from 0 to 9
   • Hexadecimal
     • The decimal numbers 10 to 15 are represented by the letters A to F, There are 16 values in this system hence the base-16 name
     • The largest byte value is 255 and you can use hexadecimal numbers to represent up to this value.
   • Image Data
     • • With 16 bits we can store 216 or 15,536 colours (This is regarded as High Colour) • With 32 bits we can store 232 or 4,294,967,296 (This is regarded as deep colour)
     • resolution of an image is the number of pixels per inch or (dpi) dots per inch
     • Metadata has everything stored on it from the lens of the camera down to the resolution of the image

4. Software

   • Functions of OS
     • Provide a GUI, The OS on most computers and smartphones provides an environment with tiles, icons and/or menus.
     • • Managing the computer’s memory • Providing a user interface • Managing hardware • Protecting data from being accidently overwritten
     • Allow user to do what they want to, have a GUI and allow multiple things to happen at once.
   • Utilities
     • Security
     • Disk Organisation
   • Types of Software
     • Off-the-shelf software is designed to provide a general set of features that a broad range of customers will find useful
     • Off the shelf software will be cheaper than custom software as the cost for developing the software can be spread across more customers
     • Open source software is free and openly available to everyone.
       • extremely reliable owing to the large number of testers and developers