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Which type of ROM has to be custom built by the factory?

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Which type of ROM has to be custom built by the factory?

(a) EEPROM

(b) Mask ROM

(c) EPROM

(d) PROM

This question was addressed to me in an online interview.

The above asked question is from Read Only Memory (ROM) topic in division Memory Devices of Digital Circuits

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Correct answer is (b) Mask ROM

Best explanation: All types of ROM are programmable and can be programmed as per requirement but the mask ROM is always programmed for specific application and it can’t be reprogrammed. PROM stands for Programmable Read Only Memory in which the ROM can be externally programmed by the user. EPROM stands for Erasable Programmable Read Only Memory, where the ROM and be cleared and re-programmed.

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