This document discusses the different types of computer memory. It describes cache memory as a buffer between the CPU and main memory that is less than 512 KB in size. It stores frequently used data and programs. Main memory, also called primary memory, is semiconductor memory that holds the data and instructions currently being processed; it is volatile and includes RAM and ROM. RAM is random access memory that constitutes the CPU's internal memory, while ROM is read-only memory that permanently stores its contents. Secondary memory, also called external memory, is non-volatile storage like hard disks and USB drives that permanently store data and are slower than primary memory.

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2.  Any physical device capable of
storing information temporarily or
permanently.
 Computer memory is the storage
space in computer where data to be
processed and instruction required
for processing are stored.
 Divided into large number of
memory cell, each having unique
address .

4.  Acts as a buffer between CPU and
main memory.
 Improves computer’s performance
and is less than 512 KB.
 It is use to hold that part of data
and program which are frequently
used by CPU.
 It is of two type L1/primary cache
(inside microprocessor) and
L2/secondary (in the motherboard
or near the microprocessor).

5.  These are semiconductor memories.
 It is known as main memory.
 Usually volatile memory.
 Holds only those data and instruction on which
computer is working.
 Data is lost in case of power failure or power turn off.
 Faster than secondary memory.
 A computer cannot run with out primary memory.
 It is of two type.
• Random Access Memory(RAM).
• Read Only Memory(ROM).

6.  It constitutes the internal
memory of the CPU for storing
program and program result.
 It is random access memory.
 A RAM memory chip is an
integrated circuit (IC) made of
millions of transistors and
capacitors.
 Volatile in nature.

7.  Non volatile in nature.
 This is a memory from which we
can only read but cannot write.
 The information is stored
permanently in such memories
during manufacture.
 Cheaper than RAMs.
 Easy to test.
 It contents are always known.
 More reliable than RAMs.

8.  It is known as external
memory.
 It is non volatile in nature .
 It is use to store data
permanently in the computer.
 CPU cannot access it directly.
 Slower than primary memory.
 These are optical and
magnetic memories.

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