iii.Which of the following is called …

rom As the name suggests, this memory allows only read operations and does not let us write anything on it. ROM is used to store low level machine functions — Microprograms, which increase the efficiency of processor. Unlike RAM, ROM retains its stored data even if the power goes off so it is non-volatile memory. ROM chip is supplied alongwith the computer system. It cannot be changed by the user. There are various types of ROMs which are available nowadays such as: (i) PROM — Programmable Read Only Memory: This type of ROM chip can be programmed according to the user by using a specialized software. Once it has been programmed, it cannot be altered further. (ii) EPROM — Erasable Programmable Read Only Memory: This type of ROM can be erased and re-programmed again and again by using specialized software. The process of erasing is done either by using ultraviolet light (UPROM — Ultraviolet PROM) or electricity (EAPROM — Electrically Alterable PROM). (iii) EEPROM — Electrically Erasable PROM: This type of ROM can be re-programmed with special electric pulses.

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rom

As the name suggests, this memory allows only read operations and does not let us write anything on it. ROM is used to store low level machine functions — Microprograms, which increase the efficiency of processor. Unlike RAM, ROM retains its stored data even if the power goes off so it is non-volatile memory. ROM chip is supplied alongwith the computer system. It cannot be changed by the user. There are various types of ROMs which are available nowadays such as:

(i) PROM — Programmable Read Only Memory: This type of ROM chip can be programmed according to the user by using a specialized software. Once it has been programmed, it cannot be altered further.
(ii) EPROM — Erasable Programmable Read Only Memory: This type of ROM can be erased and re-programmed again and again by using specialized software. The process of erasing is done either by using ultraviolet light (UPROM — Ultraviolet PROM) or electricity (EAPROM — Electrically Alterable PROM).
(iii) EEPROM — Electrically Erasable PROM: This type of ROM can be re-programmed with special electric pulses.