Hardware

Hardware

1. User with special needs

   • Braille keybored
   • Eyetyper
   • Speech recognition

2. Secondary storage

   • Solid state
     • USB
   • Optical
     • CD/DVD
   • Magnetic
     • HDD

3. Binary logic

   • Computer components use 0 and 1 (on and off)
   • Allows use of logic gates
     • AND
     • OR
     • NOT
   • High tolerance
     • Stops miltahes

4. Memory

   • Cash
   • Virtral
   • RAM
     • Volitile
   • ROM
     • Boot sequence
   • Flash
     • USB

5. CPU

   • Clock speed
     • Measured in GHz
       • 1000 million per second
   • Fetch, decode, execuite cycle
     • Fetch instructions from RAM
     • Works out what to do
     • Processes it
   • Number of cores
     • Dual and quad
     • Does improve speed
     • Not twice as fast
   • Control unit
     • Revives instructions from RAM and directs
   • ALU
     • Arithmatic logic unit
       • Does the math
   • Cache
     • High speed
       • More is faster
   • Immediate access store
     • Regitecl