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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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80386 and 80486 Microprocessor MCQs | Page 11 of 13

Q101.
The unit that handles the data and directs it to either FIFO or instruction decoder depending on the bus control logic directive is
Discuss
Answer: (d).data interface and control unit
Q102.
The unit that is responsible for carrying out all the floating point calculations, allotted to the coprocessor by 80386, is
Discuss
Answer: (c).FPU
Q103.
The sizes of instruction and data pointer registers of 80387 respectively are
Discuss
Answer: (d).48-bit, 48-bit
Q104.
To inform 80387 that the CPU wants to communicate with NPS1, the NPS1 line is directly connected to
Discuss
Answer: (c).M/IO
Q105.
Which of the following is not a newly added instruction of 80386, that are not present in 80286?
Discuss
Answer: (d).none of the mentioned
Q106.
The BSF (bit scan forward) instruction scans the operand in the order
Discuss
Answer: (b).from right to left
Q107.
The BSR (bit scan reverse) instruction scans the operand in the order
Discuss
Answer: (a).from left to right
Q108.
If a ‘1’ is encountered when an operand is scanned by BSF, then
Discuss
Answer: (b).zero flag is set
Q109.
If a ‘1’ is not encountered when an operand is scanned by BSR, then
Discuss
Answer: (a).zero flag is reset
Q110.
Which of the following is not a bit test instruction?
Discuss
Answer: (c).BSF

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