Microprocessor
The first machine cycle of an instruction is always

 A memory read cycle
 A fetch cycle
 An I/O read cycle
 A memory write cycle

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Microprocessor
How can we make any bit of a register “0”?

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

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