Computer Qrganization

Q1. Assume a computer system with four I/O devices: a printer, a disk, a communication

line and a keyboard with increasing priorities of 1, 3, 5 and 6, respectively. At t=0, a user

program starts. At t=20, a printer interrupt occurs. At t=25, a communication line

interrupt occurs. At t=50, a disk interrupt occurs and at t=60, a keyboard interrupt

occurs. Assume all interrupts take 20 time units to finish. Please draw the time sequence

as the textbook does.