- Mask-Programmed ROM - requires manufacturer to load data using photographic negative technique
- Programmable ROM (PROM) - can be programmed once by the user
- Erasable Programmable ROM (EPROM) - can be erased and reprogrammed multiple time with UV light
- Electrically Erasable PROM (EEPROM) - can be erased and reprogrammed multiple time with voltage
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