Microprocessor
At the beginning of a fetch cycle, the contents of the program counter are

 transferred to address bus.
 transferred to memory data register.
 transferred to memory address register .
 incremented by one.

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

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