When an I/O device completes an I/O operation, which of the following is/are not correct regarding the sequences of hardware events?
1
The device issues an interrupt signal to the processor.
2
Processor finishes the execution of current instruction after responding to the interrupt.
3
Processor need to save information to resume the current program at the point of interrupt.
4
Minimum information required to save to resume the current program at the point of interrupt is only the status of the processor