ROM

ROM means Read Only Memory.

ROM

It is used to store data permanently.
Here, we can't write data into it. The only thing we can do is just read data from it.
The data inside ROM will not loose when the power goes off, so it is nonvolatile

ROM is normally used to store the programs needed to run the operating system, known as boot program.

It is programmed at the time of manufacturing.

Different types of ROMs are,


1. ROM :

Read Only Memory

2. PROM

Programmable Read Only Memory.
We can write into this type of ROM. But, only once its possible.

3. EPROM

Erasable Programmable Read Only Memory.
Here, we can write the data as many times as we needed by erasing the previous.
To erase the data, we have to use ultraviolet radiation.

4.EEPROM

Electrical Erasable Read Only Memory.
Here, erasing is done with the help of electric signals. Its is much more flexible and this technology is widely using in nowadays .