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
 None
 8085 has multiplexed bus, whereas 6800 does not have
 8085 has 5 interrupts lines, whereas 6800 has only two

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Microprocessor
Ready pin of microprocessor is used

 to provide direct memory access
 to introduce wait state
 to indicate that microprocessor is ready to receive inputs
 to indicate that microprocessor is ready to receive outputs

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