Microprocessor Architecture: Real Mode Memory Addressing
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Questions and Answers

In real mode memory addressing, how much memory space is available for addressing?

  • 1K byte
  • 1M byte (correct)
  • 64K byte
  • 4G byte

What is the term used to refer to the first 1M byte of memory in real mode?

  • Conventional memory (correct)
  • Virtual memory
  • Secondary memory
  • Cache memory

How are real mode memory addresses structured?

  • Only segment address
  • Only offset address
  • Segment address multiplied by offset address
  • Segment address plus an offset address (correct)

What does the segment address define in real mode memory addressing?

<p>Beginning address of any 64K-byte memory segment (D)</p> Signup and view all the answers

How is the segment and offset address sometimes written?

<p>1000-F000 (A)</p> Signup and view all the answers

What does the code segment register define?

<p>Start of the code segment (B)</p> Signup and view all the answers

Which mode does the 80286 and above microprocessors operate in?

<p>Both real and protected modes (D)</p> Signup and view all the answers

What is the purpose of segment and offset addressing in a memory system?

<p>To allow DOS programs to be relocated in memory (C)</p> Signup and view all the answers

Why can a relocatable program be executed without change when placed in any area of memory?

<p>Because the contents of the segment register don't need to be changed (D)</p> Signup and view all the answers

What is the significance of the offset value 000016 and FFFF16 in a segment?

<p>They indicate the starting and ending addresses of the segment (C)</p> Signup and view all the answers

How does segment plus offset addressing allow DOS programs to be relocated in memory?

<p>By changing the contents of the segment register only (A)</p> Signup and view all the answers

What does it mean for a program to be relocatable in the context of memory?

<p>It can execute without change when placed in different areas of memory (B)</p> Signup and view all the answers

How does segment and offset addressing affect the relocation of data in memory?

<p>It enables data to be placed in any area of memory without change to the program (D)</p> Signup and view all the answers

What is the purpose of the adder in generating a physical memory address?

<p>To perform arithmetic operations on segment and offset values (B)</p> Signup and view all the answers

What is the significance of having an offset address within a segment?

<p>It enables easy relocation of data within memory segments (B)</p> Signup and view all the answers

What is the significance of the segment and offset values in the physical address calculation?

<p>They enable multiple combinations to yield the same physical address (B)</p> Signup and view all the answers

In the context of memory address space, where is the less significant byte stored?

<p>In the lower address byte (C)</p> Signup and view all the answers

What type of boundary is an 'aligned word' stored at?

<p>Even boundary (C)</p> Signup and view all the answers

What is the value of the data word stored at memory location 00724H?

<p>5502H (C)</p> Signup and view all the answers

Which memory address contains the most significant byte in the given example?

<p>0072B16 (D)</p> Signup and view all the answers

What hexadecimal value does the memory address 0072516 represent?

<p>7D16 (D)</p> Signup and view all the answers

What does the combination 12B0:0025 illustrate?

<p>Physical address calculation with segment and offset values (A)</p> Signup and view all the answers

Where is the least significant byte stored in a memory word according to the text?

<p>Lower address byte (D)</p> Signup and view all the answers

What type of boundary does an aligned word have its less significant byte stored at?

<p>Even boundary (D)</p> Signup and view all the answers

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