PROM

Stands for "Programmable Read-Only Memory," and is pronounced "p-rom," not "prom" like the high school dance. PROM is a type of ROM that is programmed after the memory is constructed. PROM chips have several different applications, including cell phones, video game consoles, RFID tags, medical devices, and other electronics. They provide a simple means of programming electronic devices.

Standard PROM can only be programmed once. This is because PROM chips are manufactured with a series of fuses. The chip is programmed by burning fuses, which is an irreversible process. The open fuses are read as ones, while the burned fuses are read as zeros. By burning specific fuses, a binary pattern of ones and zeros is imprinted on the chip. This pattern represents the program applied to the ROM.

While PROM cannot be erased, two other versions of PROM have been developed that can be erased and reprogrammed. One type is called EPROM, or Erasable Programmable Read-Only Memory. This type of memory uses floating-gate transistors and can be erased by strong ultraviolet light. The other type is EEPROM, or Electrically Erasable Programmable Read-Only Memory. EEPROM can be erased with an electrical charge and is used in flash memory.

Updated September 15, 2009 by Per C.

quizTest Your Knowledge

What type of device might have QoS settings?

A
Printer
0%
B
Scanner
0%
C
Monitor
0%
D
Router
0%
Correct! Incorrect!     View the QoS definition.
More Quizzes →

The Tech Terms Computer Dictionary

The definition of PROM on this page is an original definition written by the TechTerms.com team. If you would like to reference this page or cite this definition, please use the green citation links above.

The goal of TechTerms.com is to explain computer terminology in a way that is easy to understand. We strive for simplicity and accuracy with every definition we publish. If you have feedback about this definition or would like to suggest a new technical term, please contact us.

Sign up for the free TechTerms Newsletter

How often would you like to receive an email?

You can unsubscribe or change your frequency setting at any time using the links available in each email.

Questions? Please contact us.