What is the ROM? – Memory of only reading


ROM is a type of memory where data has been prerecorded. In other words, ROM is a storage medium used with computers and other electronic devices. As the name suggests, the data stored in the ROM can only be read. Modified with extreme difficulty or not modified at all. ROM retains its content even after the computer is turned off. Using a non-volatile storage medium is the only way to start this process to boot computers and other devices. ROM is mainly used for firmware updates on a computer.


ROM stands for read-only memory. In Spanish it translates as read-only memory.

What is ROM used for?

The main function of ROM memory is to store the “firmware” of a computerized equipment. Firmware is permanent software that is hardwired with integrated circuits. The manufacturer fits a specifically designed ROM chip into a device during the build process. The ROM often controls features that are integral to the device’s utility and are unlikely to need modification or customization.

Examples of ROM memory

  • A good example of a ROM is the computer’s BIOS, which is a PROM chip that stores the programming necessary to begin the computer’s initial boot process.
  • Another example of a ROM is the cartridge used with video game consoles, which allows a system to run multiple games.
  • In smartphones the internal storage of the phone is based on ROM of 16 GB, 32 GB, and more.

ROM types

Non-volatile memory types include:

  • Read Only Memory (MROM) Mask
  • Programmable Read Only Memory (PROM)
  • Electrically Programmable Read Only Memory (EPROM)
  • Electrically Erasable Programmable Read Only Memory (EEPROM also called Flash ROM)
  • Electrically modifiable read-only memory (EAROM)

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