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Explain types of ROM in detail.
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Types of Read Only Memory(ROM) :-

  1. MROM (Masked read-only memory)
  2. PROM (Programmable read-only memory)
  3. EPROM (Erasable programmable read-only memory)
  4. EEPROM (Electrically erasable programmable read-only memory)

Now, let's explain one by one.

1. MROM (Masked read-only memory) :-**Masked read-only memory was the oldest and the very first ROM. This type of ROM data is physically encoded in the circuit and only be programmed during fabrication. It was not so expensive. It is used in the system that requires log-term sustainability.


2. PROM (Programmable read-only memory) :- Programmable read-only memory is also a non-volatile memory on which the data can be written only once. Unlike the main memory, PROMs retain their contents even when the system is turned off. It is used in low-level programs such as firmware.


3. EPROM (Erasable programmable read-only memory) :- Erasable programmable read-only memory is a special type of memory that looks like PROM, but the content can be erased using ultraviolet rays. The ultraviolet rays clears its contents, making it possible to reprogram the memory. It is mainly used in the personal systems.


4. EEPROM (Electrically erasable programmable read-only memory) :- Electrically erasable programmable read-only memory is a special type of memory that can be erased by exposing it to an electrical charge. EEPROM retains its content even when the power is turned off. It is very slower in performance as compared to others. It is mainly used in microcontrollers.

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