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What is an EPROM?

EPROM is an acronym for erasable programmable read-only memory, and pronounced ee-prom, EPROM is a special type of memory that retains its contents until it is exposed to ultraviolet light. The ultraviolet light clears its contents, making it possible to reprogram the memory. To write to and erase an EPROM, you need a special device called an EPROM programmer.

An EPROM differs from a PROM in that a PROM can be written to only once and cannot be erased. EPROMs are widely used because they enable the manufacturer to change the contents of the PROM before the unit is actually shipped. This means that bugs can be removed and new versions installed shortly before delivery.

In layman's terms, they are chips that hold software. This software can be erased and updated software can be programmed in it's place.