Programmable Read-Only Memory

Programmable Read-only Memory (PROM) is 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.

See also: EPROM

This article (or an earlier version of it) contains material from FOLDOC, used with permission.