Microprocessor
The reason for the presence of ALE pin in 8085, but not in 6800 is that

 8085 has multiplexed bus, whereas 6800 does not have
 8085 has 5 interrupts lines, whereas 6800 has only two
 None
 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O

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

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

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Microprocessor
The stack pointer register in a microprocessor

 keeps the address of the next instruction to be fetched
 holds the address of the top of the stack
 counts the number of programs being executing on the microprocessor
 counts the number of instructions being executing on the microprocessor

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