Microprocessor
The stack pointer

 may be in RAM or ROM
 resides in microprocessor
 resides in RAM
 resides in ROM

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

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