1.1 Memory and CPU

1.1 Memory and CPU

1. Memory

   • Volatile
     • this is temporary memory and it requires power to retain its data
   • non-Volatile
     • this is permanent memory and it keeps its contents even when it has no power
   • Random access memory (Ram)
     • you can read and write into ram
     • Ram allows your computer to perform many tasks
     • It is also short term memory
       • where data is stored as the processor needs it
   • Read only memory (Rom)
     • it can only be read not written it
     • rom is non-volatile memory
     • it contains instructions a computer needs

2. Central Progressing Unit (CPU)

   • Fetches, Decode and Execute
   • Hertz
     • Number of ELECTRICAL CYCLES PER SECOND/ the RATE ELECTRICAL CURRENT CHANGES in the actual circuits
     • Speed is called the clock speed. It is measured in Hertz
   • MULTI-CORE can process more than one instruction at a time
     • Each core has to work on DIFFERENT PROGRAMS OEPERATING IN PARALLEL or it complicates processing
   • Purpose
     • Fetch data and instructions from memory
     • Decode and execute instructions
     • Manage movement of data and instructions to and from peripheral devices