Microprocessor
If the number of address bits in a memory is reduced by 2 and the addressability is doubled, the size of the memory (i.e., the number of bits stored in the memory)

Doubles
Increases by 2^(address bits)/addressability
Halves
Remains unchanged

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

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

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