Question

Which of memory programmed once by user and then cannot be erased and reprogrammed?

Answer 1

Answer:

While PROM cannot be erased, two other versions of PROM have been developed that can be erased and reprogrammed. One type is called EPROM, or Erasable Programmable Read-Only Memory. This type of memory uses floating-gate transistors and can be erased by strong ultraviolet light.