Types of ROM |PROM, EPROM and EEPROM
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 Memory)
Types of ROM
| 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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