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

 512
 256
 64
 65536

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Microprocessor
Program counter in a digital computer

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

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