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Computing (FOLDOC) dictionary
Programmable Read-Only Memory
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storage (PROM) A kind of ROM which can be written using a
PROM programmer. The contents of each bit is determined by a
fuse or antifuse. The memory can be programmed once after
manufacturing by "blowing" the fuses, which is an irreversible
process. Blowing a fuse opens a connection while blowing an
antifuse closes a connection (hence the name). Programming is
done by applying high-voltage pulses which are not encountered
during normal operation.