Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 It increases the speed of data transfer over the data bus
 More than one device can transmit over the data bus at the same time
 More than one device can transmit information over the data bus by enabling only one device at a time
 The data line can be multiplexed for both input and output

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Microprocessor
Program counter in a digital computer

 Counts the number of times the loops are executed.
 Counts the numbers of programs run in the machine.
 Counts the number of times a subroutine is called.
 Points the memory address of the next instruction to be fetched.

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Microprocessor
In 8085

P flag is reset when the result has even parity
P flag is reset when the result has odd parity
P flag is set when the result has odd parity
P flag is set when the result has even parity

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