3 a) Let us assume that the CS and IP values of the base and offset of an ISR are 1210h and 1010h. The ISR is 8 lines of code where each line takes 2 bits to be stored. At which address, shall we find the IRET instruction?

b) Describe the process that would take place if an interrupt arises at the IR0 pin of 8259A while servicing an interrupt that arose at IR3 pin of 8259A. You are expected to refer to the 3 registers in particular.