ITPEC FE Morning October 2022 Question 14
Topic: Computer Component
Which of the following is a memory device that stores programs or data in factories and only has the read operation for the stored programs or data?
Explanation
Mask ROM — its contents are fixed by the photomask when the chip is manufactured, and can only be read.
ROM types differ in who writes them and whether they can be rewritten:
- •Mask ROM: written at the factory during fabrication, read-only afterwards
- •PROM: written once by the user
- •EPROM: erased with ultraviolet light and rewritten
- •EEPROM and flash memory: erased and rewritten electrically
Answer (c)
Why not others:
- •(a) DRAM — volatile read/write memory that needs refreshing, used as main memory
- •(b) Flash memory — non-volatile, but electrically erasable and writable by the user, in blocks
- •(d) SRAM — volatile read/write memory built from flip-flops, used for cache
Key rule: Written in the factory and never rewritable means mask ROM; if the user can write it at all, it is PROM, EPROM, EEPROM or flash.
Computer Component · AI-written, may contain errors
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