What is ROM || Read Only Memory

What is ROM || Read Only Memory


What is ROM

What is ROM types

Classification of primary memory?

Write some uses of ROM?

Working of ROM? How ROM gets into work?

What are the advantages of ROM?

What are the disadvantages of ROM?


what is a rom



What is ROM (Random Only Memory)?

ROM stands for Random Access Memory. ROM(read-only memory) is a built-in computer memory. It contains the data which can be read-only. ROM(read-only memory) contains the programming that allows the computer to be booted-up. It contains the programming that allows the computer to be regenerated each time it is turned on. ROM(read-only memory) is sustained in the computer by a small long-life battery.

ROM is read-only memory. It is a type of storage medium that stores the data permanently on the computer and other electronic devices.  Once it is written, it cannot be changed. ROM is non-volatile which means that the data in this storage medium is not lost when the computer is turned off.


What is ROM

There are numerous ROM chips which are located on the motherboard. A few of the ROM(read-only memory) chips are also located on the expansion boards. These chips are essential for BOS (BIOS stands for Basic Input/Output.), Boot-up, Reading and Writing to the peripheral devices, data management, and the software for basic processes for certain utilities.


Types of ROM


What is ROM types:

Here are some other types of non-volatile memory. In next we will provide full detail of every topic

  • Programmable Read Only Memory (PROM).
  • Electrically Programmable Read Only Memory (EPROM).
  • Electrically ErasableProgrammable Read Only Memory (EEPROM).
  • Electrically Alterable Read Only Memory (EAROM).

All these types of non-volatile memories can be altered. These are often referred to as programmable ROM. One of the basic/original forms of non-volatile memory was mask-programmed ROM. It was designed for the data like bootstrap which contains the startup code. Mask-programmed ROM cannot be changed. Not at any cost.

Uses of ROM

ROM is used to store data permanently being non-volatile. Other uses of ROM may include microprogramming, library subroutines, system programs (BIOS), embedded system code, and function tables.


Uses of ROM


Working of ROM? How ROM gets into work?

The chip of ROM contains a grid of columns and rows. Where the column and row intersect, ROM chips are different from RAM chips.


Working of ROM

RAM uses transistors to turn on or turn off the access to a capacitor at each intersection. ROM uses a diode for connecting the lines if the value is one (1). If the value is zero (0), the lines are not connected.

It allows flowing only in one direction. It has a certain threshold, called forward break over, which determines the amount of required current before the diode will pass it on.


Advantages of ROM

As you read about What is ROM. Here we are going to read about the advantages of ROM.

  • ROM is non-volatile.
  • ROM is cheaper than RAM.
  • They are static and do not need refreshing.
  • The circuits of ROM are simple.
  • ROM is more reliable than RAM.
  • ROM is available in a longer size as compared to RAM.
  • ROM is easy to the interface than RAM.
  • There is an ease of speed and design.
  • The function of the ROM can be modified easily.
  • ROM stores data permanently.
  • ROM is secure data storage.
  • ROM starts up the computer and loads the operating system.
  • ROM is sustained by a small long-life battery.


What are the disadvantages of ROM?

  • ROM cannot be changed.
  • ROM cannot be re-created.
  • Once it is written, changes are impossible if needed.
  • As ROM is read-only.

See more related topics as given the link below.

RAM Memory

Internal parts of CPU