This PPT presentation is based on the topic COMPUTER MEMORY
COMPUTER MEMORY is very common topic for seminar presentation.
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Considering the main function performed by a computer we can broadly classify the hardware components in to the following two types named as :
1.Central Processing Unit (CPU).
2.Peripheral Devices connected to and
controlled by the CPU.
Primary storage section is also called as main memory ,may be compared to that portion of the brain where data and instructions get stored ad when a program is begins executed.
The main memory is used to :
Temporarily hold data received from input devices and
keep them ready for processing.
Hold data being processed and the intermediate results
being generated there after .
Hold the finished results of processing units released to the
Hold the system software and application software in use.
The memory where both reading and writing can take place is
known as Random Access Memory (RAM).Random access
memory (RAM) is the best known form of computer
memory. RAM is considered"random access" because
you can access any memory cell directly if you know the
row and column that intersect at that cell. It is also known
as the primary memory or volatile memory. Since access time in
RAM is independent of the address of the storage location inside
the memory is as easy to reach any other location and takes the
same amount of time.
The main memory is volatile i.e. contents of memory are lost the moments power is off. For reusing data and program ,it is essential to store them . Presently there are certain input output devices used for this purpose. Some can store huger amount of data and can retrieved them at will. No program can be executed directly from them. Programs always need to be sent to the main memory for execution. The floppy , hard disc and magnetic tapes are kind of memory . They are larger ,cheaper and slower than the main memory but can keep data intact even after power goes off. They are called secondary memory.