The word
'random' means that the computer can access any memory cell without accessing
all cells sequentially. That is, a memory is said to be random access memory if
any part of it can be accessed directly (randomly) for reading or writing data
in the same time irrespective of its location. In other words, access to this
memory is independent of physical storage location of information on the
medium. RAM is volatile as any interruption in power supply results in loss of
data in RAM. The contents of the memory remain there as long as electrical current
is available to sustain the memory's pattern of positive and negative charges
which represent the two bits 1 and O.lf power fails, all the contents in the
memory will be lost.
Types
of RAM
The various
types of RAM are DRM, SDRAM, static RAM, Vide/) RAM and flash RAM.
1. Dynamic
Random Access Memory (DRAM)
It is one of
the least expensive RAMs. But it requires frequent power refreshing to retain
memory contents.
2. SDRAM
SDRAM
(Synchronous Dynamic Random Access Memory) is a generic name for the types of
DRAM that are synchronised with the clock speed of the processor. The speed of
SDRAM is measured in terms of Megahertz. If the speed of the SDRAM and processor
is optimised, the processor can improve its performance.
3. Static
RAM
Static RAM does
not need frequent power refreshing as is required for DRAM. Hence, it is much
faster than DRAM. But, it is more expensive than DRAM.
4. Video
RAM
It is used to
storE: data for the video display monitor. It is actually a buffer between the
processor and the monitor.
5. Flash
RAM
Flash RAM or
flash memory is a non-voLatile memory. It can be erased and reprogrammed. It is
used in PC cards of notebook computers, digital camera, cell phones, embedded
controllers etc.
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