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programmable read-only memory (PROM)

Definition

programmable read-only memory (PROM)

Part of the Storage hardware glossary:

Programmable read-only memory (PROM) is read-only memory ( ROM ) that can be modified once by a user. PROM is a way of allowing a user to tailor a microcode program using a special machine called a PROM programmer . This machine supplies an electrical current to specific cells in the ROM that effectively blows a fuse in them. The process is known as burning the PROM . Since this process leaves no margin for error, most ROM chips designed to be modified by users use erasable programmable read-only memory ( EPROM ) or electrically erasable programmable read-only memory ( EEPROM ).

Next Steps

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This was last updated in March 2011

Posted by: Margaret Rouse

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