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Different types of ROM


Date: 08 Nov 2009   Posted By: swapna     Group: Computers    Category: Hardware   

Different types of ROM



Author: rahul    08 Nov 2009      Member Level: Silver     Points : 12  (Rs 10)    Voting Score: 0

Hello friend,
As you may already know ROM is read only memory. This means that the processor can only read the memory on the ROM but cannot write memory on it. This is done so that the memory on the ROM is not lost as it may contain vital system information.
Now as regards to your question, there are namely 4 types of ROM:-

* ROM
This is your normal ROM that is found in most PC's. It is designed similar to a processor, and is made out of silicon. Data can be read from it but you cannot write data on it. This is the permanent memory of the system. It is used to perform a single function.

* PROM
PROM is programmable ROM. Sometimes we may want to write some data on the ROM. In such cases we use PROM. Data can be written on it using special equipment. It is important to note that data can be written on PROM only once but it cannot be removed from the PROM.

* EPROM
EPROM is programmable ROM from which data can be programmed and erased. Note that programming and erasing is not limited to just one time. It is done using ultra violet light. The downside to this that i requires additional hardware to program it. EPROM is now used in most bios systems. This provides flexibility for the programmer.

* EEPROM
EEPROM is the next generation of ROM. It takes EPROM to the next level. As compared to EPROM, EEPROM can be programmed using software technology. The user himself can program the ROM using system software. The main advantage of this is you don't need special hardware to program it. This saves the programmer a lot of money. This has become the dominating force in the BIOS ROM market. Majority of the motherboards these days come with EEPROM.


Author: sumanjali    11 Nov 2009      Member Level: Bronze     Points : 1    Voting Score: 0

Types of roms:
ROM(Read Only Memory)
PROM(programmable ROM)
EPROM(programmable ROM from which data can be programmed and erased)
EEPROM(Extension of EPROM)


Author: Sulabh Dixit    12 Nov 2009      Member Level: Silver     Points : 8    Voting Score: 0

Random Access Memory (ROM):

Rom is a non-volatile memory that means the content written over it generally cannot be removed. It provides permanence and security as it is non-volatile and the information written over it cannot be easily modified.

Types of ROM:

@ Regular ROM: The data written over it cannot be changed; used for static programs.

@ Programmable ROM (PROM): The difference between a ROM and PROM is that; in PROM the data can be stored after the device is constructed and it becomes permanent, while in ROM data is stored at the time of construction of device and it becomes permanent.

@ Erasable PROM: This type of memory can be erased and programmed again and again. It requires ultraviolet rays to erase the content.

@ Electrically Erasable PROM: This is the most flexible type of ROM that uses special software’s to erase the content of the device. The difference between EPROM and EEPROM is that; EEPROM uses electric current to erase the content while EPROM uses ultraviolet rays.


Author: O P Sharma    12 Nov 2009      Member Level: Silver     Points : 3  (Rs 1)    Voting Score: 0

Hi
There are the following types of ROM -

1. ROM (Read only Memory) - Datas in such memory can be only be read.
2. PROM (Programmable ROM) - In this type of memory data can be written once which will be permanent after it.
3. EPROM (Erasible PROM) - The data can be written again and again in this type of ROM.
4. EEPROM (Electrically EPROM) This is most flexible EPROM, where by electrical method data are erased to write a new data.

Regards

R Sharma


Author: Vikas    12 Nov 2009      Member Level: Bronze     Points : 1    Voting Score: 0

3 types of ROM apart from ROM
PROM(programmable ROM)
EPROM(programmable ROM from which data can be programmed and erased)
EEPROM(Extension of EPROM)


Author: Ayan Kumar Ghosh    15 Nov 2009      Member Level: Bronze     Points : 0    Voting Score: 0

There are four types of rom:-
1)ROM(Read Only Memory)
2)PROM(programmable ROM)
3)EPROM(programmable ROM from which data can be programmed and erased)
4)EEPROM(Extension of EPROM)


Author: Inderpreet singh    19 Nov 2009      Member Level: Bronze     Points : 2    Voting Score: 0

Hello! friends
There are four types of ROM,as Rom is a non-volatile memory -

1. ROM :It is Read only Memory. Data in such memory can be only be read,no one can write to this.
2. PROM:It is Programmable ROM.Data can be written once which will be permanent after it,one can write in this type but once written can't be removedc or erased again.
3. EPROM:It is Erasible PROM i.e.data can be written again and again in this type of ROM by erasing first one.
4. EEPROM: It is Electrically EPROM,which is flexible one,data can be erased by electrical way to write a new one.

Now these days EEPROm is mostly used in the systems.


Author: Rajesh kumar vasupillai    19 Nov 2009      Member Level: Bronze     Points : 3  (Rs 1)    Voting Score: 0

Different types of ROM are:
1.PROM(Programmable Read Only Memory)
2.EPROM(Erasable PROM)
3.EEPROM(Electrically Erasable PROM)
A Computer BIOS chip is a ROM which stored a program permanently inside that is the initial configuration of the system.


Author: crizbone    19 Nov 2009      Member Level: Silver     Points : 2    Voting Score: 0

(ROM):ROM stands for Read Only memory

In ROM user is able only to read the contents written on it,user does not have privilege to write or edit onto it



ROM: The data once entered is permanent used for static programs.

Programmable ROM (PROM): The difference between a ROM and PROM is that; PROM is programmable by first time user,while in ROM data is stored at the time of construction of device and it becomes permanent.

Erasable PROM or EPROM: This type of memory can be erased and programmed again and again. It requires ultraviolet rays to erase the content.

Electrically Erasable PROM OR EEPROM: This is the most flexible type of ROM that uses special software’s to erase the content of the device. The difference between EPROM and EEPROM is that; EEPROM uses electric current to erase the content while EPROM uses ultraviolet rays.


Author: Chitra Prakash    20 Nov 2009      Member Level: Silver     Points : 2    Voting Score: 0

Hi,

We have the ROM, PROM, EPROM AND EEPROM.

In ROM and PROM, the data can written only once and cannot be changed or reused. In ROM the data is written at the factory. In PROM the data can be programmed by the user using special programmers available commercially for this purpose. The user can test his programs on simulators and then program the ROM to permanently put the program in the ROM. This is mainly used to put the first instructions to be executed by the processor as soon as it is powered up.

An EPROM can also be used for this purpose in the same way. The difference is that it is reusable, since the data programmed can be erased using ultra violet erasers available specially for this purpose. This IC has a see through (glass like) window through which the light passes and erases the data. In the erased state all the memory locations of the EPROM will be FF. After programming the device cover the window with a black tape to prevent accidental erasure. Continuous exposure to sun light for a long period of time can erase/change a few locations.

EEPROM is electrically erasable and Programmable device.You can erase the device using the electrical circuit.

Chitra Prakash


Author: Karthik    20 Nov 2009      Member Level: Gold     Points : 2    Voting Score: 0

Hi,

Different types of ROM are

ROM: This is your normal ROM that is found in most PC's. It is designed similar to a processor, and is made out of silicon. Data can be read from it but you cannot write data on it. This is the permanent memory of the system. It is used to perform a single function.

PROM: PROM is programmable ROM. Sometimes we may want to write some data on the ROM. In such cases we use PROM. Data can be written on it using special equipment. It is important to note that data can be written on PROM only once but it cannot be removed from the PROM.

EPROM: EPROM is programmable ROM from which data can be programmed and erased. Note that programming and erasing is not limited to just one time. It is done using ultra violet light. The downside to this that i requires additional hardware to program it. EPROM is now used in most bios systems. This provides flexibility for the programmer.

EEPROM: EEPROM is the next generation of ROM. It takes EPROM to the next level. As compared to EPROM, EEPROM can be programmed using software technology. The user himself can program the ROM using system software. The main advantage of this is you don't need special hardware to program it. This saves the programmer a lot of money. This has become the dominating force in the BIOS ROM market. Majority of the motherboards these days come with EEPROM.

Thank you.


Author: shivank tiwari    21 Nov 2009      Member Level: Silver     Points : 1    Voting Score: 0

There are different types of Read Only memory today in the market
namely
PROM(Programmable Read Only Memory):one time programmable
EPROM(Erasable PROM)
EEPROM(Electically Erasable PROM)
Flash memory: It costs much less than the EEPROM and functions similar to EEPROM.


Author: Cherry    22 Nov 2009      Member Level: Silver     Points : 3  (Rs 2)    Voting Score: 0

Hello friend

The abbreviation of ROM is 'READ ONLY MEMORY'

Read-only memory (ROM), contains the computer's permanent startup programs. ROM devices store information in a permanent fashion and are used to hold programs and data that do not change.

Types of ROM:

-Mask-Programmed ROM (MROM)
programmed at the factory.

- Programmable ROM (PROM)
can be custom-programmed by the user (once) using special circuitry.

- Erasable-Programmable ROM (EPROM)
can also be programmed and erased by the user using ultraviolet light and special circuitry external to the computer.

- Electrically Erasable PROM (EEPROM)
can be erased and reprogrammed by special circuitry within the computer.


Author: Prabhakar    24 Nov 2009      Member Level: Gold     Points : 4    Voting Score: 0

ROM - Read Only Memory - Data was written to the ROM as it was manufactored.

PROM - Programmable Read Only Memory - Data could be written to the ROM after it was manufactored

EPROM - Erasable Programmable Read Only Memory - Data could be erased if put under a special UV light.

EEPROM (Commonly called "Double-E-Prom") - Electrically Erasable Programmable Read Only Memory - Huge improvement over other methods, as it uses an electricity to actually write data to it. This is the type of memory used in Flash Drives.


Author: mani kumar    25 Nov 2009      Member Level: Bronze     Points : 0    Voting Score: 0

Types of ROM

Types-of-ROM2.doc

Author: hema    27 Nov 2009      Member Level: Bronze     Points : 1    Voting Score: 0

rom is known as read only memory,where you can read but u cannot write.three types of rom's are present .it ,s e-rom,e-prom and eeprom.




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