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RAM (Random Access Memory):

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Definition

  • A small scale size IC's memory chip used to store and access data in any order (i.e. in random order), so the name Random Access Memory.

Description

  • Also called as temporary or volatile memory.
  • Holds the program and data, which are currently processing.
  • Data is lost as soon as computer is turned off or power failure.
  • Data stored in this memory can be altered or changed.

Types of RAM

SRAM (Static RAM):

  • Fast and has less access time.
  • Consists of flip-flop using either transistor or MOS (Mosfet).
  • For each bit it requires one flip-flop.
  • Status of each bit remains as it is unless there is write operation or power is off.
  • e.g. Cache memory.
  • Advantages
    Refreshing circuit is not required.
  • Disadvantages
    Costly and low package density.
    Requires more space.

DRAM (Dynamic RAM):

  • Slower and higher access time
  • Data is stored in the form of capacitors.
  • Capacitors charges when data is 1 and doesn't charge if data is 0.
  • Because of leakage current in capacitor, they need to be refreshed to hold the data in memory cells.
  • Refreshing is the process in which the contents of each memory cell is read and written hundred times a second.
  • This maintains the data of memory cells in capacitor.
  • e.g. Main memory.
  • Advantages
    Cheaper than static RAM.
  • Disadvantages
    Requires refreshing circuit.

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Tip Box

Boost your RAM

Using pen drive as a ram, increases the cache memory of the system. In effect increases the throughput of the system.

You can find this type of software over the internet called as eboostr.


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