Microprocessor
The correct sequence of steps in the instruction cycle of a basic computer is

 Read effective address, Decode, Fetch and Execute.
 Fetch, Decode, Read effective address and, Execute.
 Fetch, Execute, Decode and Read effective address.
 Fetch, Read effective address, Decode and Execute.

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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 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
 all interrupts except non-maskable interrupt are disabled

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