6. The interrupt system of the computer has four lines IRO0 IRQ3. The highest priority has interrupt line IRQ0, the lowest IRQ3. Nested interrupts are allowed. At some point of time, an IRQ3 interrupt appears, which in turn is interrupted by IRQ2, and then the process continues in the same way until the IR00 signal appears. The process of writing dat?a to the stack and switching to the interrupt service routine takes i ?sec. The execution time of the interrupt service routine of any ofthe interrupts requires 10 ?sec. The return from the interrupt service routine takes 1 ?sec. a). Determine, what time will takes servicing of this sequence of interrupt request signals? Time b). Draw timing diagram of this process. Time