Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!

PROM:
PROM is a memory on which data can be written only oncereprogramultra violet rays
EPROM
EPROM is a memory on which only oncereprogramultra violet rays are used to clear its content and making it possible to only oncereprogramultra violet rays the memory.