Question

If you want to handle 30 interrupts, how many 8259A PIC will you need?

Answer 1

As we know that, 8259A pic can handle 8 interrupt.

total number of interrupt required = 30

so, total number of 8259A pic required to handle 30 interrupt $>8\times 4$

>30

Hence, total 4 8259A PIC required to handle 30 interrupts.