1. A 32-bit computer has two selector channels and one multiplexor channel. Each
selector channel supports two hard disks and two DVDs units. The multiplexor channel has two printers, three VDT terminals connected to it. Assume the following transfer rates.
Disk drive 800 Kbytes/s
DVD drive 700 Kbytes
Printer       20 Kbytes/s
VDT          30 Kbytes/s
Estimate the maximum aggregate I/O transfer rate in this system. Show how you estimate.
2. Given the following set of events, show which routines the CPU is executing for times 0 to 150 ms. Each handler routine (with its interrupt request) takes 25 ms to complete. The priority of the interrupts ranges from IRQ6 as the highest priority interrupt to IRQO as the lowest priority interrupt.
Time                Action
0 ms       Start of main program
10 ms                IRQ1
25 ms                IRQ3
35 ms                IRQ4
45 ms                IRQ6
55 ms                IRQ2

Time    Action
0 ms: Start of Main Program
10 ms: IRQ1
3. Why do you think the term random access device is something of a misnomer for disk drives?
4. What are the advantages and disadvantages of having a small number of sectors per disk cluster?

1. A 32-bit computer has two selector channels and one multiplexor...