These are the special types of ROM:

  • Programmable read only memory (PROM) :- This type of ROM can be re-programmed once using a special device known as PROM programmer.
  • Electrically Programmable Read Only Memory (EPROM) :- This type of ROM can have its contents erased by ultraviolet light and then reprogrammed by an EPROM programmer. This procedure can be done many times; however, constant erasing and rewriting will eventually render the chip useless.
  • Electrically Erasable Programmable Read Only Memory (EEPROM) :- This type of ROM works in a similar way to Flash memory in that it can its contents can be ‘flashed’ for erasure and then written to without having to remove the chip from its environment.

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