Microprocessor
In 8085 microprocessor based system maximum possible number of input/output devices can be connected using I/O mapped I/O technique is

 65536
 256
 64
 512

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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.
 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that the CPU has not received the HOLD request.
 Indicates that another master is requesting the use of the address and data buses.

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Microprocessor
A high on RESET OUT signifies that

 all the registers and counters are being reset
 all the registers and counters are being reset and this signal can be used to reset external support chip
 all the registers of the CPU are being reset
 processing can begin when this signal goes high

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