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Author: Admin | 2025-04-28
The data stored in it is retained even when the power is turned off. ROM is typically used to store the computer’s BIOS (basic input/output system), which contains the instructions for booting the computer, as well as firmware for other hardware devices. Stores crucial information essential to operate the system, like the program essential to boot the computer.It is non-volatile.Always retains its data.Used in embedded systems or where the programming needs no change.Used in calculators and peripheral devices.ROM is further classified into four types- M ROM , PROM , EPROM , and EEPROM . Read-Only Memory (ROM) Types of Read-Only Memory (ROM) PROM (Programmable Read-Only Memory)EPROM (Erasable Programmable Read Only Memory)EEPROM (Electrically Erasable Programmable Read Only Memory)MROM (Mask Read Only Memory) 1. PROM (Programmable read-only memory): It can be programmed by the user. Once programmed, the data and instructions in it cannot be changed. 2. EPROM (Erasable Programmable read-only memory): It can be reprogrammed. To erase data from it, expose it to ultraviolet light. To reprogram it, erase all the previous data. 3. EEPROM (Electrically erasable programmable read-only memory): The data can be erased by applying an electric field, with no need for ultraviolet light. We can erase only portions of the chip. 4. MROM(Mask ROM): Mask ROM is a kind of read-only memory, that is masked off at the time of production. Like other types of ROM, mask ROM cannot enable the user to change the data stored in it. If it can, the process would be difficult or
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