Assembly Language Basics
16 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the primary function of an assembler?

  • To convert assembly language to machine language (correct)
  • To compile programs into object code
  • To process source code line by line
  • To execute high-level programming code

    • Which best describes the role of a linker in programming?

  • It translates assembly language to a higher-level language
  • It combines multiple object files into a single executable (correct)
  • It compiles and executes code simultaneously
  • It converts high-level language directly into machine code

    • What is the purpose of directives in assembly language?

  • To provide instructions to the assembler (correct)
  • To execute instructions directly
  • To define user variables
  • To compile high-level code

    • In assembly language, what does the 'DB' directive represent?

    <p>An 8-BIT INTEGER</p> Signup and view all the answers

    What does the 'END' directive signify in a program?

    <p>The termination of the source code</p> Signup and view all the answers

    Which statement correctly defines a 'variable' in programming?

    <p>A placeholder for a user-defined name</p> Signup and view all the answers

    In assembly programming, what does the term 'label' refer to?

    <p>An address of an instruction or procedure</p> Signup and view all the answers

    What memory model does the term 'Large' refer to in assembly language?

    <p>One Data Segment of 64k and multiple Code Segments</p> Signup and view all the answers

    What does the MUL instruction do?

    <p>Multiplies a given register and stores the result in AX register.</p> Signup and view all the answers

    Which command is used to remove a specific subdirectory in DOS?

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

    How does the SHL instruction manipulate bits?

    <p>It shifts bits to the left and fills the lowest bit with 0.</p> Signup and view all the answers

    What is the purpose of the INT 21H instruction?

    <p>To initiate a system call for various DOS functions.</p> Signup and view all the answers

    What does the ROL instruction do?

    <p>It rotates bits left, copying the highest bit into the lowest bit.</p> Signup and view all the answers

    Which command allows creating a program in mnemonic code?

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

    What does the LEA instruction do?

    <p>It places an address into the specified register.</p> Signup and view all the answers

    Which numeric constant prefix is used for hexadecimal numbers?

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

    Study Notes

    Assembly Language

    • Assembly language is a low-level programming language that directly communicates with computer hardware.

    Compiler

    • Compiler is a program that converts high/mid-level language code into executable machine code.

    Assembler

    • Assembler is a program that converts assembly language code into machine language instructions.

    Interpreter

    • Interpreter processes and translates high/mid-level language code statement by statement and executes each statement individually.

    Linker

    • Linker combines object files, libraries, and other components to generate an executable program.

    Comments

    • Comments improve the readability and clarity of a program.

    Directives

    • Directives are statements that provide information to the assembler.

    Operators

    • Operators are used during assembly to influence the value of an operand.

    Pre-defined Symbols

    • Pre-defined symbols provide information to your program during execution.

    Variables

    • Variables are user-defined names that represent data.

    Name

    • A name represents the address of a data item.

    Label

    • A label represents the address of an instruction or procedure.

    Title

    • The title of the source listing is limited to 60 characters.

    Dosseg

    • Dosseg directive tells the assembler to adopt the DOS segment sequence: stack, data, and code.

    Model

    • The Model directive specifies and initializes the memory model before defining any segment.

    Small Model

    • Small model uses one code segment and one data segment.

    Large Model

    • Large model uses one data segment of 64k and multiple code segments.

    Compact Model

    • Compact model uses one code segment of 64k and multiple data segments.

    Stack

    • Stack defines the size of the stack, with a default size of 1,024 bytes.

    DATA

    • The DATA directive marks the beginning of the data segment.

    Code

    • The CODE directive marks the beginning of the code segment, which contains instructions.

    END

    • The END directive is placed at the end of the source program.

    DB

    • DB is used for defining 8-bit integers.

    FWORD

    • FWORD is used for defining 48-bit integers.

    String

    • Strings are used for descriptive data such as names or messages.

    Numeric Constant

    • Numeric constants can be defined using radix specifiers like 'd' for decimal, 'b' for binary, and 'h' for hexadecimal.

    MUL

    • The MUL instruction multiplies the value in a register with the value in the AX register.

    MOV

    • The MOV instruction copies data between registers or from an immediate value to a register.

    Carry Flag

    • The Carry flag stores information about whether an unsigned operation resulted in a value larger than the destination location could hold.

    Data Register

    • There are four 32-bit data registers used for arithmetic, logical, and other operations.

    Shift-Left-Instructions

    • Shift-left instructions shift the bits of an operand to the left, filling the lowest bit with a 0.

    SAL

    • SAL is identical to the SHL (shift left) instruction.

    REN

    • The REN command in DOS allows you to rename files.

    MD

    • The MD (Make Directory) command creates a new subdirectory.

    RD

    • The RD (Remove Directory) command removes a subdirectory.

    DIR

    • The DIR (Directory) command lists the contents of a directory.

    A

    • The A command in DEBUG allows you to create a program in mnemonic or symbolic code.

    U

    • The U (Unassemble) command in DEBUG displays the assembly code of the program.

    D

    • The D (Dump) command in DEBUG displays the contents of memory in hexadecimal and ASCII format.

    R

    • The R (Register) command in DEBUG displays the values of all registers.
    • TLINK (Turbo Linker) is a linker that combines object files, libraries, etc. into an executable program.

    MOV AH, 01H

    • This instruction requests character input.

    INT 21H

    • This instruction invokes an interrupt service.

    MOV DL, 24H

    • This instruction sets the column size.

    MOV AH, 08h

    • This instruction requests character input without displaying the entered characters on the screen.

    0A

    • Represents the Line Feed character.

    0D

    • Represents the Carriage Return character.

    ROL

    • The ROL (Rotate Left) instruction shifts each bit to the left, with the highest bit copied into the Carry flag and then into the lowest bit.

    LEA

    • The LEA (Load Effective Address) instruction places the address specified by its first operand into the register specified by its second operand.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    CSOA Quiz Reviewer PDF

    Description

    This quiz covers fundamental concepts of assembly language, including its relationship with compilers, assemblers, and linkers. Test your knowledge on comments, directives, operators, and the role of pre-defined symbols in programming. Perfect for students new to low-level programming.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser