What is RAM…? What does it do..?
Primary memory is the main memory of computer. It
is a chip mounted on the motherboard of computer. Primary memory is categorized
into two main types-
·
Random Access Memory (RAM).
·
Read Only Memory (ROM).
RAM is used for the temporary storage of
input data , output data and intermediate results. The input data entered into
the computer using the input device , is stored in RAM for processing .
After processing , the output data is stored in RAM before being sent to
the output device. Any intermediate results generated during the processing of
program are also stored in RAM . Unlike special operation . Therefore , ROM
is used to store the data that does not require to change Flash memory is another
form rewritable read-only memory that is compact , portable and requires little
energy.
· RAM is used to store data and instructions during the
operation of computer.
Ø The data and instructions that need
to be operated upon by CPU are first brought to RAM from the
secondary storage devices like the hard disk.
Ø CPU interacts with RAM to get the data and
instructions for processing.
· RAM loses information when the computer is powered off.
It is volatile memory. When the power is turned on, again, all files
that are required by the CPU are loaded from the hard disk to RAM.
· RAM provides random access to the
stored bytes , words, or larger data units . This means that requires same
amount of time to access information from RAM , irrespective of where it
is located in it.
· RAM can be read from and written to with the same speed.
· The size of RAM is limited due
to its high cost. The size of RAM is measured in MB or GB.
· RAM affects the speed and power of a
computer . More the
RAM , the better it is .
· RAM is a microchip implemented using
semiconductors.
· There are two types of RAM depending
on the technology used to construct a RAM –
DYNAMIC RAM (DRAM)
STATIC RAM (SRAM)
v DRAM is the most common type of memory
chip. DRAM is mostly used as main memory since it is small and cheap.
v SRAM chip is usually in cache memory due
to its high speed .It is very easy to use and faster than DRAM
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