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What is ROM - Explain different types of ROM

ROM stands for Read Only Memory. It is type of internal memory. The data and instructions in ROM are stored by the manufacturer at the time of its manufacturing. This data and programs cannot be changed or deleted after wards. The data or instructions stored in ROM can only be read but new data or instructions cannot be written into it. This is the reason why it is called Read Only Memory.

ROM stores data and instructions permanently. When the power is turned off, the instructions stored in ROM are not lost. That is the reason ROM is called non-volatile memory.

ROM is used to store frequently used instructions and data to control the basic input & output operations of the computer. Mostly, frequently used small programs like operating system routines and data, are stored into the ROM. When the computer is switched on, instructions in the ROM are automatically activated. These instructions help the booting process of computer.

Types of ROM
ROM is divided into following types:
  1. PROM
  2. EPROM
  3. EEPROM
1- PROM
    PROM stands for Programmable Read Only Memory. This form of ROM is initially blank. The user or manufacturer can write data/program on it by using special devices. However, once the program or data is written in PROM chip, it cannot be changed. If there is an error in writing instructions or data in PROM, the error cannot be erased. PROM chip becomes unusable.

2- EPROM
    EPROM stands for Erasable Programmable Read Only Memory. This form of ROM is also initially blank. The user or manufacturer can write program or data on it by using special devices. Unlike PROM, the data written in EPROM chip can be erased by using special devices and ultraviolet rays. So program or data written in EPROM chip can be changed and new data can also be added. When EPROM is in use, its contents can only be read.

3- EEPROM
    EEPROM stands for Electrically Erasable Programmable Read Only Memory. This kind of ROM can be written or changed with the help of electrical devices. So data stored in this type of ROM chip can be easily modified.

17 Responses to “What is ROM - Explain different types of ROM”

Naresh Chinnu said...
19 September 2013 06:11

satisfied explanation. And good answer
Thanyou


Naresh Chinnu said...
19 September 2013 06:14

satisfied explanation. And good answer
Thanyou


fazeel said...
28 November 2013 23:25

great job


Anonymous said...
29 December 2013 20:48

well xplained


Praveen said...
3 January 2014 22:46

good answer and best level to understandable language thank u


Anonymous said...
7 January 2014 10:42

What about Flash EPROM and Mask EPROM?


Great Info said...
1 February 2014 00:57

Thanks to all of you for compliment. We had stopped working to under any compulsion. Now we'll try our best to better than before and in easy words.


Anonymous said...
3 March 2014 22:55

nicly done


Anonymous said...
3 April 2014 09:58

well explained. thanku


Saiqa Arzoo said...
8 April 2014 21:40

Excellent ,very easy wording


Sumit said...
27 April 2014 04:47

Simply understandable and fantastic. Keep doing this excellent work.


Shabab Ali said...
7 May 2014 01:58

very very easy way to learn .great job


Chandra Prabhat Maurya said...
27 May 2014 03:08

good website for IBPS exam .. Thanks for the impeccable answers


romeo shed said...
30 August 2014 06:46

well explained


Sachin Sachi said...
15 October 2014 01:46

thank you...................


sharu appu said...
10 November 2014 20:59

Thank u


JIMMY FANUEL said...
19 November 2014 01:57

well explained..!!


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