Computer Systems [+embedded systems]

Computer Systems [+embedded systems]

1. A [computer] system is a collection of parts that work together for a common purpose.

2. A system receives and processes inputs in order to produce outputs.

   • Example: A holiday booking system
     • input - enquiry or deposit process - search or booking output - ticket reservation
   • Example: A computer game system
     • input - press key or button process - work out movement output - changes to screen made

3. Parts of a [computer] system

   • These parts are also sometimes called functions: 'Functions of a System'
   • Devices
     • Input
     • Output
   • Storage
   • Processor
   • Software

4. Embedded Systems

   • Dedicated systems that are designed for a fixed purpose.
   • Embedded systems are different from computer systems.
     • Computer systems use software for a range of purposes.
     • Embedded Systems use software for a single, fixed purpose
   • Parts of embedded systems
     • These parts are also sometimes called functions: 'Functions of Embedded Systems'
     • Software
     • Processor
     • Storage
     • Devices
       • Input
       • Output
   • Characteristics
     • Found within larger computer, mechanical or electrical systems
     • Often with real-time computing constraints
       • real-time computing (RTC), or reactive computing describes hardware and software systems subject to a "real-time constraint", for example from event to system response.
     • Found in...
       • car engines
       • MP3 Players
       • Spacecraft
       • Anti-lock brakes

5. Characteristics

   • Processes data to produce information
   • Fast and programmable
   • Found in most electronic gadgets...
     • Washing machines
     • Burglar alarms
     • Cameras
     • P.Cs
       • P.C stands for Personal Computer
     • Telephone
     • Smartphones