Microprocessor
Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions

 the microprocessor cannot be interrupted by any interrupt
 the microprocessor can be interrupted by a non-mask able interrupt
 the microprocessor cannot be interrupted by any mask able interrupt
 all interrupts except non-maskable interrupt are disabled

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

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

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Microprocessor
The stack pointer register in a microprocessor

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

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