At the machine-instruction level, which item below is a valid example of a raw machine language instruction?

Difficulty: Easy

Correct Answer: 10001101

Explanation:

Introduction / Context:Programming levels range from high-level languages to assembly to machine code. Machine language is the binary form executed directly by the CPU, represented as sequences of bits (opcodes and operands).

Given Data / Assumptions:

  • We must identify a raw machine language example.
  • Operands and mnemonics like ADD or GOTO are assembly or higher, not binary machine code.

Concept / Approach:Machine code is encoded as bit patterns such as 10001101, where different bit fields represent operation and addressing. Assembly is a symbolic representation (e.g., ADD 5) that must be assembled into binary. High-level constructs like GOTO XOUT are compiler-level and further removed from hardware encoding.

Step-by-Step Solution:

Identify binary literal → '10001101' fits the definition.'ADD 5' is assembly (mnemonic + operand).'GOTO XOUT' is a high-level or pseudo-instruction, not pure machine code.

Verification / Alternative check:Assembler tools translate mnemonics into opcodes; only the binary stream is executed by the CPU.

Why Other Options Are Wrong:They are not raw binary machine instructions.

Common Pitfalls:Confusing human-readable mnemonics with what the CPU actually fetches and executes.

Final Answer:10001101

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