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Which among the following is not a type of Read Only Memory (ROM)?
1. EPROM
2. EEPROM
3. PROM
4. DROM
5. None of these

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Correct Answer - Option 4 : DROM

The correct answer is DROM.

  • ROM is a non-volatile memory where the memory content could be read multiple times but could not be written.
  • There are 4 types of ROM: MROM, PROM, EPROM, and EEPROM.
  • Masked read-only memory (MROM): It is a type of ROM, that is masked off during production. It used in systems that require long-term sustainability.
  • Programmable read-only memory (PROM):
    • It is a memory that can be programmed only once after it is created. Once programmed, the information written is permanent and cannot be deleted. 
  • Erasable Programmable read-only memory (EPROM):
    • It is a programmable ROM that can be erased and re-used. It can be erased by exposing it to ultra-violet light.
  • Electrically Erasable and Programmable Read-Only Memory (EEPROM):  
    • It is a programmable ROM that allows the stored data to be erased electrically.

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