Microprocessor
In microprocessor based system I/O ports are used to interface

 the O/P devices only
 the I/P device only
 all the I/O devices
 the I/O devices and memory chips

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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

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

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