7 – IT Computing Questions

 

(1) When data is input into a computer, it is nearly always manipulated and stored in some standard data format. Why is the use of standard data formats essential, or indeed, crucial to successful data processing? Information technology (IT) systems are considered to consist of four major components. What are the four components of an IT system? Briefly, describe each.

 

(2) What is a register? Be exact.

 

(3) Define a “bus”? What is the purpose of a bus? What three types of data might a bus carry?

 

 

 

 

(4) How does pipelining improve the efficiency of a CPU? What is the potential effect of executing a conditional branch instruction on the efficiency gained by pipelining? What technique(s) can be employed to make pipelining more efficient when executing conditional branch instructions?

 

 

 

(5) Carefully describe the advantages and disadvantages of master-slave multiprocessing and symmetrical multiprocessing. Which would you select for fault-tolerant computing? Why?

 

 

 

 

(6)

 

 

Consider the following register and memory values:

 

 

 

Register

Contents

 

Memory Locations

Contents

1

150

 

150

412

2

151

 

151

006

3

350

 

152

153

4

351

 

153

000

PC

320

 

350

152

BR

405

 

351

413

X

198

 

352

001

AC

352

 

410

320

 

 

 

411

123

 

 

 

412

413

 

 

 

413

222

 

 

 

PC is the Program Counter, BR is a Base Register, X is an Index Register, AC is the Accumulator.

 

 

 

a. Compute the result of an ADD IMMEDIATE 150 instruction.
b. Compute the result of an ADD DIRECT 150 instruction.
c. Compute the result of an ADD INDIRECT 150 instruction.
d. Compute the result of an ADD REGISTER 2 DIRECT instruction.
e. Compute the result of an ADD REGISTER 2 INDIRECT instruction.
f. Compute the result of an ADD BASE REGISTER 6 instruction.

 

 

 

 

 

(7)

 

Describe the trade-offs between the memory cache write-through and write-back techniques.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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