PROM , EPROM and EEPROM – Types of ROM | Computer And IT Applications

PROM, EPROM and EEPROM
Types of ROM | Computer And IT Applications
BBA | BBA-TT | BCIS
Management Notes

ROM stands(Read Only Memory) is the memory from which we can only read but cannot write on it.This is a volatile memory because the information is stored permanently in such memories during the time of manufacture.A ROM, stores such instructions that are required to start a computer. This operation is referred to as bootstrap.ROM chips are not only used by the computer but also in other electronic items like a washing machine and microwave oven.ROM is of three types which are as follows:

  • PROM (Programmable Read Only Memory)
  • EPROM (Erasable and Programmable Read Only Memory) and
  • EEPROM (Electrical Erasable and Programmable Read Only Memo

Difference between PROM, EPROM and EEPROM

PROM

(Programmable Read Only Memory)

EPROM

(Erasable and Programmable Read Only Memory)

EEPROM

(Electrical Erasable and Programmable Read Only Memory)

PROM is is a type of ROM that can be modified only once by a user. EPROM is a type of ROM that can be erased by exposing it to ultra-violet light and  can be reprogrammed. EEPROM is a type of ROM that is programmed and erased electrically.
PROM cannot be changed once you program it. EPROM can be reprogrammed by erasing the content on it exposing it to ultra-violet light. EPROM can be reprogrammed by  erasing the content on it using electricity.
PROM was developed by Weng Tsing Chow in 1959. EPROM was developed by Dov Frohman at Intel in 1971. EEPROM was developed by George Perlegos at Intel in 1978.

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