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Welcome to the 80386 and 80486 Microprocessor MCQs Page

Dive deep into the fascinating world of 80386 and 80486 Microprocessor with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of 80386 and 80486 Microprocessor, a crucial aspect of Microprocessor. In this section, you will encounter a diverse range of MCQs that cover various aspects of 80386 and 80486 Microprocessor, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Microprocessor.

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Check out the MCQs below to embark on an enriching journey through 80386 and 80486 Microprocessor. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Microprocessor.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of 80386 and 80486 Microprocessor. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

80386 and 80486 Microprocessor MCQs | Page 5 of 13

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Q41.
Which of the following is a system segment register?

a.

GDTR

b.

LDTR

c.

IDTR

d.

None of the mentioned

Discuss
Answer: (b).LDTR
Q42.
The test register(s) that is provided by 80386 for page caching is

a.

test control registers

b.

page cache registers

c.

test control and test status registers

d.

test control and page cache registers

Discuss
Answer: (c).test control and test status registers
Q43.
Among eight debug registers, DR0-DR7, the registers that are reserved by Intel are

a.

DR0, DR1, DR2

b.

DR4, DR5

c.

DR1, DR4

d.

DR5, DR6, DR7

Discuss
Answer: (b).DR4, DR5
Q44.
The registers that are used to store four program controllable break point addresses are

a.

DR5-DR7

b.

DR0-DR1

c.

DR6-DR7

d.

DR0-DR3

Discuss
Answer: (d).DR0-DR3
Q45.
The register DR6 hold

a.

break point status

b.

break point control information

c.

break point status and break point control information

d.

none of the mentioned

Discuss
Answer: (a).break point status
Q46.
The flag bits that indicate the privilege level of current IO operations are

a.

Virtual mode flag bits

b.

IOPL flag bits

c.

Resume flag bits

d.

None of the mentioned

Discuss
Answer: (b).IOPL flag bits
Q47.
The registers that are not available for programmers are

a.

data and address registers

b.

instruction pointers

c.

segment descriptor registers

d.

flag registers

Discuss
Answer: (c).segment descriptor registers
Q48.
Which of the following is not a scale factor of addressing modes of 80386?

a.

2

b.

4

c.

6

d.

8

Discuss
Answer: (c).6
Q49.
Contents of an index register are multiplied by a scale factor that may be added further to get the operand offset in

a.

base scaled indexed mode

b.

scaled indexed mode

c.

indexed mode

d.

none of the mentioned

Discuss
Answer: (b).scaled indexed mode
Q50.
Contents of an index register are multiplied by a scale factor and then added to base register to get the operand offset in

a.

base scaled indexed mode

b.

scaled indexed mode

c.

indexed mode

d.

none of the mentioned

Discuss
Answer: (a).base scaled indexed mode
Page 5 of 13

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