Which characteristic describes PROM (programmable read-only memory)?

• A. Chips that are manufactured blank and can be programmed repeatedly
• B. Chips that can be erased electronically
• C. Chips that are manufactured blank and then can be programmed once
• D. Chips that can be read and written multiple times

Answer: (C)

The characteristic of PROM (programmable read-only memory) refers to its ability to be programmed once after manufacturing. PROM chips are initially produced in a blank state, meaning they contain no pre-written data. Once the user writes their desired data onto the chip, this information is effectively locked in and cannot be modified or erased. This one-time programmability is what differentiates PROM from other types of memory. Unlike EPROM or EEPROM, which allow for erasure and reprogramming, PROM is a permanent solution for storing data that will not change after it has been programmed. This property makes PROM ideal for applications where the data must remain constant and where minimal changes are expected.