The Von Neumann architecture

The Von Neumann architecture

1. What Is a computer

   • Input-process-output

2. What is the purpose of the CPU?

   • Fetch, decode, execute instructions

3. ALU - arithmetic logic unit

   • PC- programme counter
     • MAR- memory address register
       • MDR- memory data register
         • ACC- accumulator
           • CIR-current instruction register
             • Contains the current instruction during processing
           • where arithmetic and logic results are stored
         • Holds data that is being transferred to or from memory
       • Holds the memory location of data that needs to be accessed
     • contains the address of the next instruction to be executed
   • Stores results to memory

4. computers process information quicker when its cool. The CPUY keeps the computer from overheating

   • The memory stores the programme.
     • In 1945 John Von Nevmann designed comnputers with stored programs
       • Calculators is an example of stored programs. it is a computer
     • In modern computers this memory is RAM

5. program-memory-accumlator

   • its a cycle