Microprocessor
A microprocessor without the interrupt facility

 cannot be used for DMA operation
 is not useful for process control system
 cannot be interfaced with any I/O devices
 is best suited for process control system

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Microprocessor
When RET instruction is executed by any subroutine then

 the PC will be incremented after the execution of the instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction.
 without any operation, the calling program would resume from instruction immediately following the call instruction and also the PC will be incremented after the execution of the instruction.
 the top of the stack will be popped out and assigned to the PC.

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