Expert answer:Input/Output and storage systems

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Name:____________________________
CMIS 310
HOMEWORK #6 – Week #6
1.
A 32-bit computer has two selector channels and one multiplexor channel. Each
selector channel supports two magnetic disk and two magnetic tape units. The
multiplexor channel has two line printers, two card readers, and five VDT
terminals connected to it. Assume the following transfer rates.
Disk drive
700 Kbytes/s
Magnetic tape drive
200 Kbytes
Line printer
6.6 Kbytes/s
Card Reader
1.2 Kbytes/s
VDT
1 Kbytes/s
Estimate the maximum aggregate I/O transfer rate in this system.
2.
Given the following set of events, show which routines the CPU is executing for
times 0 to 100 ns. Each handler routine (with its interrupt request) takes 20 ns to
complete. The priority of the interrupts ranges from IRQ6 as the highest priority
interrupt to IRQ0 as the lowest priority interrupt.
Time
0 ns
10 ns
25 ns
40 ns
50 ns
Time
Action
0 ns:
10 s:
Start of Main Program
IRQ1
Action
Start of main program
IRQ1
IRQ4
IRQ6
IRQ3
3. We pointed out that I/O buses do not need separate address lines. Construct a
timing diagram similar to Figure 7.7 that describes the handshake between an I/O
controller and a disk controller for a write operation. (Hint: You will need to add a
control signal.)
1
Figure 7.7
4. Why do you think the term random access device is something of a misnomer for
disk drives?
5. What are the advantages and disadvantages of having a small number of sectors
per disk cluster?
2
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