What is ROM in Computer and How It Works – ROM Definition

What is ROM in Computer (ROM Definition)

What is ROM: Those of you who use a smartphone or computer must wonder what is ROM? You cannot understand the meaning of ROM here as you understand it. But whenever you buy a mobile, it definitely comes to ROM and computer. What is Computer Definition?

So you must know whether its size should be more or less on mobile. When you buy a mobile you will find that the internal memory is 32 GB but it is 29 GB or less. I will answer in this article, What is Rom and how it works. Who invented the computer first?

ROMs are not of a kind, they keep changing day by day according to technology. So let’s learn something new, what is ROM and how many types are there. What is Computer Full Form?

What is ROM in Computer or Mobile? (ROM Definition)

What is ROM in Computer
What is ROM in Computer (ROM Definition)

ROM is a type of memory and it is just part of the computer’s primary memory. A computer has two types of memory, primary and secondary, two types of primary memory, one RAM and the other ROM.

Its full name is Read-Only Memory by its name, you must be knowing that we can just read this memory. It has a fixed program (or can say permanent memory), we simply cannot change this program, because the correct answer is that when you buy a computer there is already a BIOS program.

It helps to launch the system and with its links to the BOIS computer and the operating system.

So this BIOS already resides in the new computer and the memory in which it resides in the name of the ROM and an example is the FIRMWARE Software program which is attached to the hardware. And the program contained in the firmware is also on a ROM chip.

This memory is also called non-volatile memory. This memory is made only when the computer. ROMs are not only used on computers or mobiles, but we can also use them on a few other electronic devices as well.

Such as washing machine, microwave oven, TV, AC. So due to technology changes, there are different types of ROMs too. We will talk more about this in the variants of ROM.

ROM features:

  • The ROM is a persistent memory (permanent).
  • It saves all the functionality instructions.
  • ROMs are read-only. This means that the information it contains is read-only.
  • In terms of price, the ROMs are cheaper than the RAM.
  • ROMs use very little power, while they are very reliable.

What are the types of ROM?

Here on Computer, the work of doing Computer On is done by a software program, whose name is Firmware which resides in ROM. There are four different types of ROM.

  • Masked Read-Only Memory (MROM)
  • Programmable Read-Only Memory (PROM)
  • Erasable and Programmable Read-Only Memory (EPROM)
  • Electrically Erasable and Programmable Read-Only Memory (EEPROM)

1. Masked Read-Only Memory

This is the first ROM, it is not used at all in today’s world. This is Read-Only Memory Hard Wired Devices. Which had a lot of pre-programmed data and instruction stores. The national memory was quite expensive. Latest Processors 2020 

2. Programmable Read-Only Memory

This is a read-only memory that we can change only once. The change here means putting the latest programs into PRM and also called update and never update again.

User Blank PROM is purchased and then the Instruction that wants to be inserted in it can be inserted (Instruction means some commands which do some work). These memories have small fuses so that instruction is inserted through programming. Once it has been programmed, you will not be able to delete it again. What is Core in Processor?

3. Erasable and Programmable Read-Only Memory

There is another variant of this ROM, its specialty is that we can delete it and be programmed again. The way to erase this memory is completely different, you pass this memory up to 40 minutes with Ultra Violet Lite, but it’s empty.

We know a little more in detail, “EPROM Eraser” is also used to achieve this work. While doing Programming, (Programming means updating or inserting some new program) Charge is put inside it, which is kept for more than 10 years because there is no way for Charge to get out. Therefore, it remains inside that memory.

So to eliminate this charge (instruction), the Ultra Violet Light goes through the quartz crystal window.

4. Electrically Erasable and Programable Read-Only Memory

Due to technology changes, readable memory needs to be changed in every short time, which is why this memory was used. Its feature is that we can delete it and program it 10,000 times, and in just 4 to 10 milliseconds we can delete and program it too.

For it, we can select any memory location in it and we can delete and program the same. Due to this advantage, it is an EEPROM seat but is slow. So till now, you know what ROM is (what is ROM in Hindi) and types of ROM in Hindi now know about its benefits.

How does ROM work?

Whenever we switch computers, there is not much difference between your computer and the mobile. That means both have the same computing power.

This is generically called ” BIOS ” ( Basic Input Output System ). Even though initially your computer is not so smart, but these BIOS chips which are in the computer help the computer to access all startup routines on the disk drive include RAM usage for all types of computers.

This BIOS is stored on a ROM chip, otherwise, the computer will know how to do it with other hardware associated with it. Like RAM, ROM chips also have a grid of columns and rows. However, where these columns and rows intersect, they differ substantially from the ROM chips.

Where RAM uses transistors to turn a capacitor on or off, to access it in the intersection, while ROM diode is used to connect these lines if they have a value of 1.

In order for the ROM chip to function correctly, it is very important for its programming to be fully perfect and it is also important to have complete data with it when the chip is being created. You will never be able to reprogram or re-write a standard ROM chip.

If something goes wrong or you have to update any data, then you have to change the ROM or make a new one. The original template for the ROM chip is very difficult to create, though it takes a lot of experimentation and error.

Advantages Of ROM

So now you know what is ROM in computer and how it works.

  • ROM’s data never change automatically.
  • It is cheaper than RAM.
  • ROM is more reliable than RAM. Because there is a data RAM as long as there is a power supply.
  • It doesn’t need to be refreshed repeatedly.
  • There are many things in this data, which cannot be changed repeatedly.

ROM Definition (What is ROM)

The ROM is just a brief overview of readable memory. It refers to a computer memory chip with permanent or semi-permanent data. Unlike RAM, the ROM is non-volatile; Even after you shut down your computer, the contents of the ROM will remain. How does Computer Works?

Almost every computer comes with a small amount of ROM with boot firmware. It contains a few kilobytes of code that explains what to do when a computer starts up, for example, running hardware diagnostics and loading the operating system into RAM. The boot firmware on a PC is called BIOS.

The ROM is read-only. You will need to physically replace your ROM chips and physically replace the ROM programs. Contemporary versions of ROM allow some limited rewriting, so you can usually upgrade firmware like BIOS using the installation software. Writable ROM chips include PROMs (programmable read-only memory), EPROMs (read-only memory)


So friends today, what was ROM in computer, how it works also and ROM definition (What is ROM in English), you must have felt very good, I hope you find this information useful for you.

There are some terms in it, which would be smiling to understand if you are non-technical, but still, if you want to ask any question, then please write in the below comment box.


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