Microprocessor
In 8085 microprocessor system with memory mapped I/O, which of the following is true?

 Devices have 8-bit address line
 Devices are accessed using IN and OUT instructions
 Arithmetic and logic operations can be directly performed with the I/O data
 There can be maximum of 256 input devices and 256 output devices

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of instructions being executing on the microprocessor
 counts the number of programs being executing on the microprocessor
 holds the address of the top of the stack
 keeps the address of the next instruction to be fetched

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Microprocessor
The interrupt facility is provided in microprocessor to

 change the sequence of the instructions being executed
 stop the microprocessor when it starts malfunctioning
 keep a control on the working of the microprocessor
 stop the microprocessor when desired

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