Topic 1

Topic 1

1. What is a computer system?

   • It is a collection of parts which work together for a common purpose.
   • It must produce something
     • An output

2. What does a computer system include

   • Input devices
   • Output devices
   • Storage
   • Processor
   • Software

3. Standards help contact other systems

   • Propietary
     • Owned by a company
     • Looks and feels familiar
     • Predictable/reliable
     • Free updates
     • Maintained by one company
   • Industry Standards
     • Been agreed to across the computing industry
     • Usually how easily interconnection between two devices is
       • U.S.B. is the industry standard to connect devices
   • De facto standards
     • Develop over time until they become accepted
   • Open Standards
     • Publicly available
     • Modified by the user
     • Issues are addressed quickly
     • Community of developers
     • Usually High Quality

4. Reliability

   • Avail
     • Percentage of time for user
     • Takes out any planned downtime for maintenance
   • MTTF
     • Mean Time TO Failure
     • Average number of hours before something breaks

5. Testing a computer System

   • Hardware redundancy
     • E.G. if a power cable breaks another is there to replace it
   • Data refundancy
     • Having 2 or more hard disks storing data at the same time
   • Backing up precedures
     • Having external storage

6. Ethical and Legal Issues

   • Legal Issues are issues with the law
     • Sharing Personal information without owners consent
   • Whether something is morally right or wrong
     • Posting a hurt full post on facebook