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x86 Assembly Language Instructions Quiz
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x86 Assembly Language Instructions Quiz

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Questions and Answers

Which instruction reads a 32-bit integer from standard input and returns it in the EAX register?

  • ReadString
  • WriteDec
  • WriteInt
  • ReadInt (correct)
  • What is the purpose of the SetTextColor instruction?

  • Display a message and pause the program
  • Write an integer in binary format to standard output
  • Set foreground and background colors for text output (correct)
  • Read a string from standard input
  • Which operation manipulates a last-in-first-out data structure?

  • WriteHex
  • WriteBin
  • GetString
  • Push (correct)
  • What does the WaitMsg instruction do?

    <p>Pause the program until the user presses Enter key</p> Signup and view all the answers

    Which instruction writes a null-terminated string to standard output?

    <p>WriteString</p> Signup and view all the answers

    What should be in the EDX register when using the WriteDec instruction?

    <p>Offset where the string is stored</p> Signup and view all the answers

    What is the purpose of ending a label with a double colon?

    <p>To limit the scope of the label to the current procedure</p> Signup and view all the answers

    Which method is commonly used for passing parameters between programs or procedures?

    <p>Passing arguments in registers</p> Signup and view all the answers

    What is the representation of True and False in Booleans?

    <p>1 for True and 0 for False</p> Signup and view all the answers

    What does the Zero flag indicate in the Flags Register?

    <p>Result of an operation is zero</p> Signup and view all the answers

    When is the Carry flag set in the Flags Register?

    <p>Result of an unsigned arithmetic too large</p> Signup and view all the answers

    What flag indicates a negative result in the Flags Register?

    <p>Sign flag</p> Signup and view all the answers

    What does the CrLf function do?

    <p>Advances the cursor to the beginning of the next line.</p> Signup and view all the answers

    Which register stores the delay time in milliseconds in the Delay function?

    <p>EAX</p> Signup and view all the answers

    What is the purpose of the GetCommandTail function?

    <p>Copies the program command line into a null-terminated string.</p> Signup and view all the answers

    What does the ReadChar function do?

    <p>Reads a single character from standard input.</p> Signup and view all the answers

    Study Notes

    Input and Output Instructions

    • The ReadInt instruction reads a 32-bit integer from standard input and returns it in the EAX register.
    • The WriteString instruction writes a null-terminated string to standard output.
    • The ReadChar function reads a character from standard input.

    Terminal Operations

    • The SetTextColor instruction sets the text color.
    • The CrLf function inserts a carriage return and line feed.
    • The WaitMsg instruction waits for a message from the operating system.

    Flags Register

    • The Zero flag indicates whether the result of an operation is zero.
    • The Carry flag is set when an operation results in a carry or borrow.
    • The Negative flag indicates a negative result in the Flags Register.

    Functions

    • The Delay function pauses program execution for a specified time, stored in the ECX register in milliseconds.
    • The GetCommandTail function retrieves the command tail.

    Data Structures and Boolean

    • The Push and Pop operations manipulate a last-in-first-out (LIFO) data structure.
    • In Boolean, True is represented as 1 and False as 0.

    Assembly Language

    • Ending a label with a double colon (::) is a way to define a label in assembly language.
    • The WriteDec instruction requires the value to be written in the EDX register.

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    Description

    Test your knowledge of x86 assembly language instructions by identifying the functions of commands like CrLf, Delay, DumpMem, DumpRegs, and GetCommandTail. Understand how these instructions are used to manipulate memory and registers in hexadecimal format.

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