3. It is the internal memory that can be
directly accessed by the control unit of
CPU. It provides temporary storage for
data an instructions being processed and
information produced by ALU e.g. RAM
and ROM.
5/17/2014by M.Zain
3
4. It allows us to read as well as write
functions. The data or information stored in
this memory is not permanent. It gets lost
whenever the power is switched off. Thus it
is said to be volatile in nature.
5/17/2014by M.Zain
4
5. This memory allows only read functions.
The information once stored in its type of
memory cannot be changed. It is
permanent in nature and is said to be non-
volatile in nature.
5/17/2014by M.Zain
5
6. Secondary memory also known as
External or Auxiliary memory is used to
store a large amount of data permanently.
Some of secondary memory devices are
Hard disk, Floppy disk and etc.
5/17/2014by M.Zain
6
7. It is a circular plastic plate coated with
magnetic iron oxide, sealed inside a
protective plastic cover. It is portable and
can be easily carried from one place to
another.
5/17/2014by M.Zain
7
