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

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

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Microprocessor
A microprocessor is ALU

 and memory on a single chip.
 register unit and control unit on a single chip.
 register unit and I/O device on a single chip.
 and control unit on a single chip.

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.
 Indicates that another master is requesting the use of the address and data buses.
 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that the CPU has not received the HOLD request.

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