Microprocessor
A mask programmed ROM is

 programmed at the time of fabrication
 programmed by the user
 erasable and programmable
 erasable electrically

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Microprocessor
How can we make any bit of a register “1”?

 OR that bit with “0” and remaining bits with “1”.
 AND that bit with “1” and remaining bits with “0”.
 AND that bit with “0” and remaining bits with “1”.
 OR that bit with “1” and remaining bits with “0”.

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