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📝 Interrupt Driven I/O Data Transfer in 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 7. Interrupt Instructions of 8085 • 31 questions available

Practice MCQs for Interrupt Driven I/O Data Transfer in 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. What is the purpose of the CMA instruction in 8085 assembly?

🔹 A. To increment the accumulator

🔹 B. To complement the accumulator (1's complement)

🔹 C. To store the accumulator to memory

🔹 D. To add an immediate value

💡 Difficulty: easy | ✅ Correct: B

Q2. Why does the program use the ADI 01 H instruction after CMA?

🔹 A. To set the carry flag

🔹 B. To obtain the 2's complement

🔹 C. To clear the accumulator

🔹 D. To store the result

💡 Difficulty: medium | ✅ Correct: C

Q3. A system requires converting a 4‑byte signed integer from two's complement to its magnitude representation using interrupt‑driven I/O. Which sequence correctly adapts the given program?

🔹 A. Add a routine to detect sign, then complement all bytes and add 1

🔹 B. Replace CMA with NEG instruction

🔹 C. Remove the carry handling logic

🔹 D. Use only ADI 01 H on each byte

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Memory Mapped I/O in 8085 Microprocessor 📝 I/O Mapped I/O or Isolated I/O in 8085 Microprocessor 📝 Data Transfer Schemes in 8085 Microprocessor 📝 Programmed I/O Data Transfer in 8085 Microprocessor 📝 Direct Memory Access (DMA) Data Transfer in 8085 Microprocessor

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