Ram and Rom

Sophie Maddox
Mind Map by Sophie Maddox, updated more than 1 year ago
Sophie Maddox
Created by Sophie Maddox over 6 years ago


Ram vs Rom

Resource summary

Ram and Rom
  1. RAM
    1. RAM is a fast temporary type of memory in which programs, applications and data are stored.
      1. Here are some examples of what's stored in RAM:
        1. the operating system
          1. applications
            1. the graphical user interface (GUI)
            2. RAM: Random Access Memory
            3. ROM
              1. Rom is memory that cannot be changed by a program or user. Rom retains its memory even after the computer is turned off.
                1. For example, ROM stores the instructions for the computer to start up when it is turned on again.
                2. ROM: Read Only Memory
                3. Static Ram
                  1. SRAM is a type of RAM and it is a volatile memory, which looses its data when the power is turned off. In a SRAM, each bit that stores data is made up of four or six transistors that make up a flip-flop. There are additional transistors that are used to control read and write accesses of storage cells. Even though typical SRAMs use six transistors to store each bit, there are SRAMs that use eight, ten or more transistors to store a single bit.
                    1. When the number of transistors is reduced, the size of the memory cell decreases. Each SRAM cell can be in three different states called read, write and standby. A cell is in the reading state when data has been requested and it is in writing state when the data in the cell is modified. The cell is in the standby state when it is idling.
                  2. Dynamic Ram
                    1. DRAM is also a volatile memory that uses separate capacitors to store each bit. Capacitors when not charged represent the value 0 of a bit and when charged represent the value 1. Since the capacitors discharge with time, they need to be refreshed periodically to maintain the values stored in them. Each memory cell in a DRAM consists of a capacitor and a transistor and these cells are arranged in a square array. DRAMS are widely used for main memories in personal computers and game stations since they are cheaper.
                      1. DRAMs are manufactured as integrated circuits (ICs) that come in plastic packages with metal pins that could be connected in to busses. Currently there are DRAMs in the market that are manufactured as plug-in modules, which are easier to handle. Single In-line Pin Package (SIPP), Single In-line Memory Module (SIMM) and Dual In-line Memory Module (DIMM) are some examples of such modules.
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