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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.
Publication Source: FDA Glossary of Computerized System and Software Development Technology
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