Computer Hardware


Main Parts of a Computer:


What happens when you turn a computer on?

  1. BIOS runs – it checks memory and for the existence of I/O devices
  2. BIOS loads in the operating system (Windows 2000)
  3. Operating system lets you run programs and sends output to correct devices.


What does a microprocessor do?

  1. Simple math (add, subtract, multiply and divide
  2. Movement of data from one memory location to another
  3. Comparisons of values (<, >, =)
  4. Movement from one set of instructions to another


It contains:


Performance is measured by speed:

      1.5 gigahertz (clock speed) in a Pentium 4

      1.7 billion instructions per second


How does memory work?