EPROM: Erasable and programmable read only memory. It is a type of semiconductor read only memory in which contents can be erased and rewritten any number of times. To erase either electrical signals are used.
PROM: Programmable read only memory. It is read only memory which can be programmed only once. Any number of read operation can be done. To program the PROM internal fuses are burnt, connecting or disconnecting transistors, which acts as switches internally.
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