Computing

Computing

1. Software

   • Viruses
     • Malware
     • Trojans
     • Worms
     • Adware/Spyware
   • Types of software
     • Off the shelf software
     • Proprietary software
     • Custom written software
     • Open source software

2. Computer hardware

   • Input devices
     • Keyboard
     • Mouse
     • Microphone
   • Output devices
     • Monitor
     • Speakers
     • Printer
   • The motherboard
     • The CPU
       • Brain of the computer
       • Fetch-decode-execute cycle
       • Fetches instructions from the hard drive
     • FSB
     • BSB
     • Cache
       • Level 1 in the CPU
       • Level 2
       • Level 3
     • Arithmetic and logic unit

3. representation of data in computer systems

   • Conversions
     • Binary
       • 8 bit
       • Only uses 1's and 0's
     • Denary
     • Hexadecimal
       • 16 bit
       • 1-9
       • A(10)-F(15)
   • Sound
     • Microphone measures change in air pressure
     • Sample rate
     • Digital audio quality
   • Image data
     • resolution
     • Metadata
     • Colour depth
     • Pixels
   • Analogue and digital data
     • Digital data is used in things like computers, cameras and phones
     • Analogue data is in the fom of waves which you make when you speak

4. Fundamentals of a computer system

   • Standards
     • Proprietary standards
     • Open standards
     • De facto standards
     • Industry standards
   • Reliability
     • Mean time to failure (MTTF)
     • Avail