
EPROM (Erasable Programmable Read Only Memory) memories are PROMs that can be deleted. These chips have a glass panel that lets ultra-violet rays through. This is why this type of PROM is called erasable.
EEPROM (Electrically Erasable Read Only Memory) memories are also erasable PROMs,
but unlike EPROMs, they can be erased by a simple electric current, meaning that they can be erased even when they are in position in the computer.

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