programmable read only memory

What is programmable read only memory?

programmable read only memory meaning A chip which may be programmed by using a PROM programming device. It can be programmed only once. It cannot be erased and reprogrammed. Each of its bit locations is a fusible link. An unprogrammed PROM has all links closed establishing a known state of each bit. Programming the chip consists of sending an electrical current of a specified size through each link which is to be changed to the alternate state. This causes the “fuse to blow”, opening that link.


reference: U.S . Food & Drug – Glossary of Computer System Software Development Terminology (8/95)