Questions and Answers
What does the symbol '#' in 'AND.B #$C0,DO' do?
What is the purpose of the label 'FALSE' in the given assembly code?
What is the effect of the instruction 'AND.B #%11000000,DO'?
What is the equivalent of 'BRA EXIT' in a high-level language?
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What is the addressing mode used in the instruction 'MOVE NUM,D0'?
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What is the purpose of the 'MOVE' instruction in assembly language programming?
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What is the effect of the instruction 'AND.B #192,DO'?
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What is one of the major goals of computer science?
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What is the purpose of the 'BRA' instruction in assembly language programming?
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What is the ultimate goal of learning assembly language?
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What is a benefit of abstraction in computer science?
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What is the relationship between high-level languages and assembly language?
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What is a key difference between assembly language and high-level languages?
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What is the purpose of the AND.B instruction?
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Why is understanding computer hardware important for computer professionals?
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What is the function of the CMP.B instruction?
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What is the focus of assembly language programming?
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What is the purpose of the BEQ instruction?
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What do high-level languages abstract and hide from users?
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What is the difference between the CMP and SUB instructions?
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What is the purpose of the MOVE.B instruction?
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What is the symbol % used for in assembly language?
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What is the purpose of the control flow instructions in the algorithm?
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What is the purpose of the addressing mode used in the MOVE.B instruction?
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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
andSUB
.
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.