Q1) having a system under the following constraints: user program with 4 phases that consume 2 seconds, 9 seconds, and 7 seconds respectively, and two write operations. I/0 program and I/O command...

Q1) having a system under the following constraints: user program with 4 phases that consume 2 seconds, 9 seconds, and 7 seconds respectively, and two write operations. I/0 program and I/O command that consume 5 seconds and 8 seconds respectively.

Show the consumed times for the system to be executed with:

a- sequential interrupts

b- interrupt free