The 1971 invention of EPROM essentially solved problem 3, since EPROM (unlike PROM) can be repeatedly reset to its unprogrammed state by exposure to strong ultraviolet light.
1971. pronalaskom EPROM, suštinski je rešen problem broj 3, jer EPROM (za razliku od PROM) može više puta da se vraća na neprogramirano stanje izlaganjem jakim ultaljubičastim svetlostima.