Assembly Language Programming Quiz
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Questions and Answers

What is the final hexadecimal value in register AX after executing the loop 5 times?

  • 0033h
  • 5555h (correct)
  • 0011h
  • 0000h

    • The program continues to loop until AX is less than 5555h.

    False

    What does the instruction 'MOV BX, 0' accomplish in this program?

    It initializes register BX to 0.

    The instruction 'PUSH AX' is used to store the value of AX on the _____ stack.

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

    Match the following registers with their final values in hexadecimal:

    <p>AX = 5555h BX = 0005h SI = 000Ah SP = FFF5h</p> Signup and view all the answers

    What happens during a far call in assembly language?

    <p>The segment address is pushed to the stack along with the code segment.</p> Signup and view all the answers

    Macros are called only once in the assembly code and can be reused multiple times.

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

    What is the primary benefit of using macros in assembly programming?

    <p>Increased readability and reduced redundancy in the source code.</p> Signup and view all the answers

    In assembly language, a procedure can be reused by calling it multiple times, whereas a _____ expands directly in the program's code.

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

    Match the assembly instructions with their functions:

    <p>CALL = Invokes a procedure RET = Returns control from a procedure or macro MOV = Transfers data from one location to another ADD = Performs addition of values</p> Signup and view all the answers

    What does the instruction 'MOV AX, 1234h' do?

    <p>It transfers the value 1234h into the AX register.</p> Signup and view all the answers

    A macro should be defined below the code that uses it.

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

    What happens when a macro is called multiple times in a program?

    <p>The macro's code is duplicated in the program for each call.</p> Signup and view all the answers

    What does the 'D' field indicate in a machine instruction?

    <p>Whether the register is a source or destination</p> Signup and view all the answers

    The W field indicates whether the operand is 16 bits when W=1.

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

    What does the 'R/M' field represent in a machine instruction?

    <p>Register/Memory</p> Signup and view all the answers

    The high byte of the immediate data cited in the instruction is referred to as _____

    <p>Data.Haut</p> Signup and view all the answers

    Match the following fields with their meaning:

    <p>D = Indicates source or destination W = Indicates data width MOD = Addressing mode REG = Register identifier</p> Signup and view all the answers

    What is the operation code for the MOV instruction that transfers data from a register to a memory location?

    <p>1010 001W</p> Signup and view all the answers

    The Data.Bas field corresponds to the high byte of the immediate data.

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

    In the MOV instruction, what does 'Acc' stand for?

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

    What is the result of the operation MOV AL, 11100000b followed by SHL AL, 1?

    <p>11000000b</p> Signup and view all the answers

    The instruction AND AL, 11011111b will clear the bit in AL where the corresponding bit in 11011111b is 0.

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

    What does the instruction SUB do in assembly language?

    <p>Subtracts the source operand from the destination operand.</p> Signup and view all the answers

    In an OR operation, the result is 1 when at least one of the operands is _____.

    <p>1</p> Signup and view all the answers

    What value does AL hold after the instruction MOV AL, 41h?

    <p>01000001b</p> Signup and view all the answers

    The Shift Right (SHR) instruction shifts bits to the left.

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

    What does the Carry Flag (CF) represent in the shifting operations?

    <p>It indicates the bit that is shifted out of the register.</p> Signup and view all the answers

    Match the assembly instruction with its description:

    <p>MOV = Transfer data from source to destination SHL = Shift bits to the left SHR = Shift bits to the right OR = Perform a logical OR operation</p> Signup and view all the answers

    What does the .code directive indicate in an assembly program?

    <p>Defines the section containing program instructions</p> Signup and view all the answers

    The MOV instruction is used to move data from one variable to another in an assembly program.

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

    What assembly directive is used to declare a variable that can hold a single byte?

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

    In an assembly program, the ______ segment is where all variables are declared.

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

    What is the purpose of using the ? symbol in variable declaration?

    <p>To indicate that the value is currently unknown</p> Signup and view all the answers

    Match the following assembly terms with their definitions:

    <p>DB = Define byte DW = Define word ORG = Origin directive RET = Return from subroutine</p> Signup and view all the answers

    Before using variables in the code segment, you must move the address of the data segment to the ______ register.

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

    What does the RET instruction do in an assembly program?

    <p>Returns control to the calling procedure</p> Signup and view all the answers

    What does the Auxiliary Flag (AF) indicate?

    <p>Carry on the 3rd bit</p> Signup and view all the answers

    The Sign Flag (SF) is set to 1 if the least significant bit (LSB) of the result is 1.

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

    What is the purpose of the Direction Flag (DF) in addressing modes?

    <p>It determines whether SI and DI registers will be incremented or decremented during operations.</p> Signup and view all the answers

    In immediate addressing mode, the operand appears in the instruction itself, such as in the example MOV AX, ___ .

    <p>5</p> Signup and view all the answers

    Match the addressing mode with its description:

    <p>Register addressing = Uses CPU internal registers Immediate addressing = Operand is a value in the instruction Direct addressing = Operand is a memory address Register Indirect addressing = Data accessed through a base register</p> Signup and view all the answers

    Which instruction would set IF to 0, ignoring interruptions?

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

    The value of the Trap Flag (TF) is set to 1 to allow block execution.

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

    What command is used to modify the Trap Flag (TF) to 1?

    <p>OR AX, 0000000100000000b</p> Signup and view all the answers

    In direct addressing mode, the operand contains the __________ of the data in memory.

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

    Which register is NOT included in the CPU registers mentioned?

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

    Study Notes

    Computer Architecture 2 - Part 3 & 4: Microprocessor Language

    • This course document covers computer architecture, specifically microprocessor language, for parts 3 and 4.
    • The outline includes topics like introduction to assembler language, machine language, and high-level languages; addressing modes; common instructions; program structure; practical exercises; and summary/conclusions.
    • Assembly language is a programming language that translates instruction text into task codes understandable by microprocessors.
    • Different types of microprocessor languages exist, and each are tailored for the corresponding processors.
    • Examples include: Motorola 6800 language for the 6800 microprocessor, and the 8086 language for the 8086 microprocessor.
    • Simulators and editors assist in writing and developing assembly programs for various microprocessors.
    • Assembly language is a low-level language, closer to machine language (binary code) than high-level languages.
    • The course documents describe how assembly language code is translated into machine code by a compiler/assembler.
    • Machine instructions are unique binary sequences for each particular instruction, and not easily understood by humans.
    • Machine language instructions have specific formats and fields (OpCode + addressing mode).
    • The provided slides enumerate several addressing modes, covering concepts like register addressing, immediate addressing, direct addressing, register indirect addressing (based), and others.
    • The document also presents common assembly language instructions including MOV, ADD, SUB, and LOGICAL operations.
    • CPU registers, including general-purpose and special-purpose registers, and their usage are explored.
    • The use of the FLAGS register (PSW register) and its various status bits (like Carry, Zero, Overflow, Parity flags etc) is explained.
    • The document explains the execution unit (EU) and bus interface unit (BIU) of the microprocessor.
    • The different types and specific uses of assembly instructions like PUSH, POP, LOOP, LOOPNE and more are outlined.
    • The structure of a program (the various sections such as .data and .code sections) for storing variables and instructions respectively are detailed.
    • The slides also cover important topics such as common assembly language programming mistakes, techniques, and best practices.
    • The materials present examples related to memory, interrupts, and other specific functionalities.

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    Computer Architecture 2 PDF

    Description

    Test your knowledge on assembly language programming concepts, including register values, loops, and macros. This quiz covers various instructions and their purposes, as well as the benefits of using macros in assembly programming. Perfect for students learning about low-level programming techniques.

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