Binary Operations in Assembly Language
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Questions and Answers

What does the symbol '#' in 'AND.B #$C0,DO' do?

  • Represents a label in the assembly program
  • Specifies the immediate addressing mode (correct)
  • Informs the assembler that the following value is an address
  • Indicates the following value is a hexadecimal number
  • What is the purpose of the label 'FALSE' in the given assembly code?

  • It is used to specify a branch target
  • It is a dummy label that is not used by the assembly program (correct)
  • It is used to skip over unused code
  • It serves as a reminder to the programmer of the action to be taken when a test is false
  • What is the effect of the instruction 'AND.B #%11000000,DO'?

  • It performs a logical AND operation between the binary value 11000000 and the contents of DO, and stores the result in DO
  • It performs a logical AND operation between the binary value 11000000 and the contents of DO, and discards the result (correct)
  • It loads the binary value 11000000 into DO
  • It stores the result of the logical AND operation in a memory location
  • What is the equivalent of 'BRA EXIT' in a high-level language?

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

    What is the addressing mode used in the instruction 'MOVE NUM,D0'?

    <p>Immediate addressing</p> Signup and view all the answers

    What is the purpose of the 'MOVE' instruction in assembly language programming?

    <p>To load or store data</p> Signup and view all the answers

    What is the effect of the instruction 'AND.B #192,DO'?

    <p>It performs a logical AND operation between the decimal value 192 and the contents of DO, and stores the result in DO</p> Signup and view all the answers

    What is one of the major goals of computer science?

    <p>To use abstraction to insulate the users from how the computer works</p> Signup and view all the answers

    What is the purpose of the 'BRA' instruction in assembly language programming?

    <p>To control program flow</p> Signup and view all the answers

    What is the ultimate goal of learning assembly language?

    <p>To directly manipulate the hardware</p> Signup and view all the answers

    What is a benefit of abstraction in computer science?

    <p>It allows users to perform complex tasks without knowing how the computer works</p> Signup and view all the answers

    What is the relationship between high-level languages and assembly language?

    <p>High-level languages are translated into assembly language to use the hardware</p> Signup and view all the answers

    What is a key difference between assembly language and high-level languages?

    <p>Assembly language directly manipulates the hardware</p> Signup and view all the answers

    What is the purpose of the AND.B instruction?

    <p>To test the value of specific bits in the input</p> Signup and view all the answers

    Why is understanding computer hardware important for computer professionals?

    <p>So they can fill gaps in their abilities as programmers or system administrators</p> Signup and view all the answers

    What is the function of the CMP.B instruction?

    <p>To test the value of specific bits in the input</p> Signup and view all the answers

    What is the focus of assembly language programming?

    <p>Specifying exactly how the hardware should work</p> Signup and view all the answers

    What is the purpose of the BEQ instruction?

    <p>To branch to a label if the test is true</p> Signup and view all the answers

    What do high-level languages abstract and hide from users?

    <p>The underlying hardware</p> Signup and view all the answers

    What is the difference between the CMP and SUB instructions?

    <p>CMP evaluates the difference between the operands, while SUB stores the result in the destination</p> Signup and view all the answers

    What is the purpose of the MOVE.B instruction?

    <p>To move data between registers or memory locations</p> Signup and view all the answers

    What is the symbol % used for in assembly language?

    <p>To indicate the following operand is hexadecimal</p> Signup and view all the answers

    What is the purpose of the control flow instructions in the algorithm?

    <p>To test the value of specific bits in the input and branch accordingly</p> Signup and view all the answers

    What is the purpose of the addressing mode used in the MOVE.B instruction?

    <p>To specify the register or memory location to be accessed</p> Signup and view all the answers

    Study Notes

    Binary Numbers and Operations

    • In assembly language, numbers can be interpreted as binary values using the % symbol, e.g., %#11000000.
    • The AND instruction performs a logical AND operation between the binary value and the contents of a register or memory location.
    • The # symbol informs the assembler that the following value is not an address of a memory location, but the value itself.

    Assembly Language Programming

    • Assembly language is used to directly manipulate the hardware, giving the programmer control over how the hardware works.
    • It does not rely on abstraction, unlike High-Level Languages (HLL), and uses a different vocabulary.
    • Assembly language is translated into machine code that the computer's hardware can execute.

    Addressing Modes

    • Immediate addressing is used to specify an arithmetic constant as an operand.
    • The MOVE instruction can be used to load a value into a register, e.g., MOVE NUM, D0.
    • The BRA instruction is equivalent to a GOTO in a high-level language and causes a branch to a labeled instruction.

    Conditional Statements

    • Conditional statements are used to test conditions and branch to specific instructions based on the result.
    • The CMP instruction is used to compare the contents of a register or memory location with a value.
    • The BEQ instruction branches to a labeled instruction if the comparison result is equal.

    Registers and Flags

    • The Condition Code Register (CCR) contains flags that are set based on the result of arithmetic and logical operations.
    • The Z (zero) flag is set if the result of a subtraction is zero.
    • The bits of the CCR are modified by certain instructions, such as CMP and SUB.

    68K Assembly Language

    • The 68K assembly language is used to program the 68000 microprocessor.
    • The language uses a specific syntax and vocabulary to specify instructions and operands.
    • The MOVE.B instruction is used to move a byte-sized value into a register or memory location.

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    Description

    Understand how to perform logical AND operations in assembly language, including interpreting binary and hexadecimal values.

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