Memory
Capacity.
1.
Less Memory
Capacity
For normal usage
small capacity is enough. You can use
normal office packages and access internet & E-mail with a less
memory. You can even play a simple game
using less memory. Normally using small
capacity of memory you can open one or two windows at a time.
2.
Medium Memory Capacity
To use latest
versions of normal day today use software packages at lease medium capacity of
memory would need. If you have this you
can open 4-5 windows at a time. Handling
small databases, small network and taking printouts from printer connected to
several PCs is possible with medium capacity memory.
3.
Large Capacity
Memory
To use publishing
animation and web creating software like Corel Draw, Flash, Maya etc. For complex games and workgroup which
transfer big amount of data at a time also need a large Capacity of Memory.
01.2. Read Only
Memory (RAM)
As the name implies these are read only
memories. Once data written into these
cannot be changed. But data written on this
memory will not be deleted when power goes off.
Mask
ROM
This is the basic
type of ROM chip. This is Program when
producing. At a time huge number of
chips must be produced.
PROM
(Programmable Read Only Memory)
These are
programmed after the production. But
after programmed the data can’t be changed.
EPROM
(Erasable Programmable Read Only Memory)
As the name implies,
this can be programmable and erasable.
It’s easy to identify these chips. It has a small window (hole) on the
chip covered by a transparent piece of glass.
From this window you can see the circuit inside the chip. Erasing and Programming is done using this window. Ultra Violet Raze is used for this purpose.
EEPROM
(Electrically Erasable Programmable ROM)
EPROM and EEPROM differ
from the way the programming and erasing process done. For EEPROM Ultra Violet Raze is not
used. Instead of that High Voltage is
used. But EEPROM can be erased and
programmed for limited number of times.
So that EEPROM cannot be used for RAM chips. Other thing is even to erase 1bit of data
whole chip has to be erased.
EROM
(Electrically Alterable ROM)
This can be used
same as RAM chips. Special feature is,
not like RAM these chips are non-volatile.
But less speed than RAM chips.
FLASH
MEMORY
This is a new kind
of EEPROM. On this data can be erased
and rewrite. For this process voltage of
a functioning computer can be used.
Special feature is these are non-volatile and the capacity also high.
