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Programmable Read-Only Memory (PROM) is a type of digital memory with bit settings attached to fuses. It allows for a one-time or initial changing of read-only memory (ROM).
PROM is primarily meant for smaller productions that require some initial programming. With PROM, the memory chips cannot be improved when they become obsolete. That, plus other limitations, has made PROM a somewhat phased-out type of product and technology in the catalogs of some of today's vendors. In many cases, PROM has been replaced by other methods that involve more flexibility, such as Electronically Erasable Programmable Read-Only Memory (EEPROM).
A process known as "burning the PROM" blows fuses for bit settings, rendering them unchangeable.