Definition of ROM

Amiga 1200 Kickstart 3.0 ROM Chips
MOS6502/Wikimedia Commons/Public Domain

Definition: Read Only Memory (ROM) is computer memory that can permanently store data and applications within it. There are various types of ROM with names like EPROM (Eraseable ROM) or EEPROM (Electrically Eraseable ROM).

Unlike RAM, when a computer is powered down, the contents of the ROM are not lost. EPROM or EEPROM can have their contents rewritten by a special operation. This is called 'Flashing the EPROM' a term that came about because ultra violet light is used to clear the contents of the EPROM.

Also Known As: Read Only Memory


Alternate Spellings: EPROM, EEPROM

Examples: A new version of the BIOS was flashed into the EPROM

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Your Citation
Bolton, David. "Definition of ROM." ThoughtCo, Aug. 26, 2020, Bolton, David. (2020, August 26). Definition of ROM. Retrieved from Bolton, David. "Definition of ROM." ThoughtCo. (accessed March 23, 2023).