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storage (characteristics (organization, location processor, internal,…

- - - - size
      - weight
      - color
      - illumination
      - feeling
    - - varies smoothly bet 2 extremes
      - continuous range of values
      - time-continuous
  - - - finite levels
        ie discrete values
      - time-discrete
    - - easier to design
      - less affected by noise
        
        can be reconstructed
      - programmable
      - easy to strore
    - - real world = analog
        
        need to convert
        analog to digital
        vice versa
      - cannot represent real world
        
        information lost in conversion #
- - - - to read and write
        
        read = process transferring stored info out memory
        
        write = process storing new info in memory
      - registers
        
        small, high speed storage
        
        holds data/instructions temporarily
        
        part of microprocessor, not memory
        
        functions
        
        storing the location from where an instruction was fetched,
        
        storing an instruction while the control unit decodes it
        
        storing data while the ALU computes it
        
        storing the results of a calculation
      - cache
        
        very high speed semiconductor memory
        
        functions
        
        buffer bet cpu and main memory
        
        holds data that cpu uses frequently
      - main memory
        
        rom
        
        read only memory
        
        non volatile
        
        read only under normal memory access
        
        switch off - still hold data
        
        contain bios
        
        bios = basic input output system
        
        program to control boot up
        
        ram
        
        random access memory
        
        volatile
        
        read and write under normal memory access
        
        switch off - data lost
        
        store data/program
        when computer is running
        
        stores OS, running apps and its data