Hardware

Hardware

1. CPU

   • fetch, decode and execute
     • changes them into usable instructions
   • the brain of the computer
   • Gets instructions from the RAM

2. CPU

   • clock speed
     • the clock speed how many cycles of fetch, decode and execute can be done in a second
     • measured in Hertz
       • one Hertz = one instruction
     • Sends the instruction to the appropriate piece of hardware
   • One Hertz = one instruction
   • Has "Cores"
   • CPU hardware
     • The ALU (Arithmetic processing unit)
       • Performs mathematical and logical processes
     • The CU (Control Unit)
       • gets instructions, decodes them and executes them. it calls on the ALU if necessary
     • Cache memory
       • Memory caching is when data is stored on super fast static RAM (SRAM)
       • Disk Cahce is used to improve Reading/ writing time on hard drives

3. RAM

   • Stores instructions that the CPU Decodes
     • the applications
   • Volatile
     • memory is deleted when the PC turns off
   • RAM increases your PC's speed

4. ROM

   • stores PC boot up instructions
   • Involatile
     • Memory stays when pc is turned off
   • Cannot be editted

5. Virtual memory

   • Sores instructions the CPU doesn't currently need
   • usually twice as much as RAM
   • Stored in Hard drive
   • if your PC doesn't have enough RAM for what your doing, it will use virtual memeory
   • Virtual memory has security purposes as well
     • this is due to the memory being isolated from the RAM