Unit 2 - Computer Science

Unit 2 - Computer Science

1. CPU

   • The purpose of the CPU is to process data, search for and sort information, it also makes calculations.
   • The CPU uses the Fetch - Execute Cycle, this is where the CPU Fetches an instruction from the Main Memory, decodes the instruction, then executes it.
   • Clock Speed is the rate at which the CPU processes at.
   • Cache is a small chunk of fast memory built into the CPU. The CPU looks in the Cache first.

2. Binary

3. Memory

   • RAM
     • RAM stands for Random Access Memory.
       • RAM doesn't save memory, it's only temporary.
       • You need RAM for saving temporary memory and also for using multiple programs at once.
       • The amount of RAM effects in a personal computer
   • ROM
     • ROM stands for Read Only Memory.
       • ROM permanently saves memory.
       • You need ROM for storing BIOS (Basic Input/Output System)

4. Input & Output Devices