Microprocessor
The program counter in a 8085 micro-processor is a 16-bit register, because

 It facilitates the user storing 16-bit data temporarily
 There are 16 address lines
 It counts 16-bits at a time
 It has to fetch two 8-bit data at a time

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Microprocessor
HLDA signal in 8085 performs the following operation:

 Hold the data in the accumulator until the microprocessor is turned OFF.
 Indicates that the CPU has received the HOLD request and that it will relinquish the bus in the next clock cycle.
 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
When .9432 E – 4 is subtracted from .5452 E – 3 in normalized floating point mode

None of the numbers is changed
Both Ihe numbers are changed and their exponents are, made equal to -5
.5452 E – 3 is changed to 5.452 E – 4 but .9432 E – 4 is not changed
.9432 E – 4 is changed to .09432 E – 3 and .5452 E – 3 is not changed

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