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.
Compiled Computer notes
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