What is ROM? Types of ROM in Detail

Have you ever heard about ROM, if we ask this question to you then you will definitely say that you are familiar with this name. So do you know what this ROM is? What is ROM? What is the full form of ROM?

Today’s round is a round of Smartphone and Computer, we know very well that there is no person in the present time who does not have a Smartphone, you need to know what makes this Smartphone composed of what? If you go to buy a new Smartphone, then you have to ask, how much memory capacity does it have?

In reply to this, you are told that this smartphone has 32GB, 64GB, or 128GB Internal Storage? Do you know what else is known in this memory, do you want to know how much storage you need?

Today in this post, I will tell you what is ROM, how it works and how many types is it?

ROM Full Form

By the way, you might have come to know that what is the full form of ROM, if not yet, then there is the full form of the ROM “Read Only Memory”

R – Read

O – Only

M – Memory

What is ROM? What is Read Only Memory?

The complete form of ROM is Read Only Memory. Read Only Memory (ROM) is a type of storage medium that stores data permanently on Personal Computer (PC) and other Electronic Devices. There is a programmable required to start a PC, which is essential for bootup; It performs major input / output and keeps instructions for the program or software.

Because the ROM is for read only, it can not be changed, as the name suggests; It is Permanent and Non-volatile, which means that it keeps its memory even when power is removed. In contrast, random access memory (RAM) is volatile; It is lost when the power is removed.

Many ROM chips are located on the motherboard and some are on expansion boards. This is necessary for the chips basic input output system (BIOS).

ROM is the only physical hardware device in which the BIOS (basic input output system) software is stored. The BIOS has machine instructions and data that are stored in ROM memory devices. Read Only Memory (ROM) An integrated circuit is also called firmware.

Difference Between RAM and ROM

  1. ROM is a form of permanent storage while RAM is a form of temporary storage.
  2. ROM is non-volatile memory whereas RAM is volatile memory.
  3. ROM can hold data without electricity, while the RAM requires electricity to hold data.

How does ROM works? How does Read Only Memory work?

The chips that make Computer’s Internal Memory come in two broad flavors known as RAM and ROM. RAM chips remember things while running on a computer, so whatever they are doing on the computer is used to store it in a very short time.

ROM usually stores data permanently. Usually electronic devices use ROM. For example, Rome is used on Android phones, computers, laptops and more. For example, a memory card is a ROM that stores information continuously today.

When creating a computer, some programs are inserted into this memory. Closing the computer does not delete any information stored in this memory. This is a reading memory. It can not be modified. ROM does not lose its data even when the power off on the computer The information in this section is read-only, but it can not be written. Therefore it is called read only memory. There are currently many such roms developed. By which data can be saved and then new data can be saved.

It is either modified with extreme difficulty or not at all. ROM is used mostly for fimware updates, which includes programming, which helps the computer to ‘boot’.

Types /Examples of ROM ( Read Only Memory )

ROM is differentiated based on the methods used for data on ROM chip. It can be classified in the following types: –

1.Mask Read-Only Memory (MROM)

2.Programmable Read-Only Memory (PROM)

3.Erasable Programmable Read-Only Memory (EPROM)

4.Electrically Erasable Programmable Read-Only Memory (EEPROM)

5.Flash Read-Only Memory (Flash ROM)

Mask Read-Only Memory (MROM):

In this type of ROM, the specification of the ROM is derived from the manufacturer in the designated form in the tabular form by the manufacturer, and then creates a related mask for the path to generate the desired output. . This is expensive, because the seller charges a special fee from the customer to create a special ROM.

Use – They are used for sound operating in the network operating system, server operating system, laser printer for fonts, electronic music instruments.

Programmable Read-Only Memory (PROM):

It is first made in the form of blank memory, and then it is programmed to store information. The difference between PROM and Mask ROM is that PROM is built as a blank memory and programmed after creation, while a mask ROM is programmed during the creation process.

To program PROM, a PROM programmer or PROM burner is used. Procedure to PROM is called PROM as burning. In addition, the data stored in it can not be modified, so it is called a one time programmable device.

Uses – They have many different apps, including cellfone, video game console, RFID tag, medical device and other electronics.

Erasable Programmable Read-Only Memory (EPROM):

This eliminates the loss of PROM, which, once programmed, its fixed pattern becomes permanent and can not be changed. If a bit pattern is changed, then Bit Pattern will have to be replaced, PROM becomes unusable.

This problem has been overcome by EPROM, because when EPROM is kept for a long time under a special ultraviolet light, then shortwave radiation brings EPROM back to its initial state, after which it can be programmed accordingly . PROM Programmer or PROM Burner is used to remove content.

Use – Before the arrival of EEPROMs, some microcontrollers, like some versions of Intel 8048, Freescale 68HC11 used EPROM to store their programs.

Electrically Erasable Programmable Read-Only Memory (EEPROM):

It is similar to EPROM, except that EEPROM is replaced by ultraviolet light, in its initial state by the application of electrical signals. In this way, it provides ease in deletion, because it can be done, even if the memory is positioned in the computer. It eliminates or writes a byte data at a time.

Use – It is used for the storege of computer system BIOS.

Flash Read-Only Memory (Flash ROM):

This is an advanced version of EEPROM. The difference between EEPROM and Flash ROM is that in EEPROM, only 1 byte of data can be removed or written in a particular time, whereas, in flash memory, blocks of data (usually 512 byts) in a particular time Can be removed or written. So, the Flash ROM is much faster than EEPROM.

Use – In many modern PCs, your BIOS is stored on a flash memory chip, which is called the flash BIOS and is also used in Modem.

So friends hope you would have liked this information today and had received information about the ROM from this post, so if you liked this information today, please share the post with your friends as soon as possible. And what is the ROM? If you have any question about it then you can comment and ask us,,


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