Computer systems

Computer systems

1. PC

   • Input
   • Output
   • Storage
     • RAM
       • Holds programs and data temporarily and forgets it all when the computer is switched off

2. Types

   • Information systems
     • Library systems
     • Police National Database
     • Google
   • Control and monitoring systems
     • Temperature control
     • Hospital monitoring
   • Communication
     • Emails
     • Mobile phones
     • The internet

3. Reliability measures

   • Mean time between failure
   • System availability or downtime

4. Disaster recovery

   • Backups
   • Disk Mirroring (RAID)
   • Hardware sourcing

5. Standards

   • De Facto Standards
     • A de facto standard is something that is used so widely that it is considered a standard for a given application although it has no official status.
   • De Jure Standards