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Erasable programmable read-only memory

An Erasable programmable read-only memory (EPROM) is a computer memory chip which is normally read only, but can be erased and then re-programmed.

There are two main types:

UV erasable, these have a window in the middle of the package. Shining ultraviolet light onto the window will erase the memory in, typically, 10 to 20 minutes.
Electrically erasable, see EEPROM.

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