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📝 Programming in Mode 0 for 8255A

📖 From An Introduction To Microprocessor 8085 • 8. Programmable Peripheral Interface (PPI) 8255A • 28 questions available

Practice MCQs for Programming in Mode 0 for 8255A. 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 does the CMA instruction do in an 8085 assembly program?

🔹 A. Store accumulator to memory

🔹 B. Complement the contents of the accumulator

🔹 C. Copy accumulator to register B

🔹 D. Add immediate value to accumulator

💡 Difficulty: easy | ✅ Correct: B

Q2. How does a hand assembler differ from a machine assembler in 8085 programming?

🔹 A. Hand assembler converts mnemonics to binary automatically

🔹 B. Machine assembler requires manual entry of op‑codes via a hexadecimal keypad

🔹 C. Hand assembler uses a hexadecimal keypad for op‑codes while machine assembler accepts mnemonics from an alphanumeric keyboard

🔹 D. Both methods produce identical source code without any difference

💡 Difficulty: medium | ✅ Correct: C

Q3. How can instruction timing affect I/O operations on the 8085?

🔹 A. Faster timing always improves I/O reliability

🔹 B. Longer instruction cycles can cause missed peripheral signals

🔹 C. Timing has no impact on I/O because the CPU and peripherals are independent

🔹 D. Only NOP instructions influence I/O timing

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Details of PPI IC 8255A 📝 8255A Operational Modes 📝 Control Word Format for 8255A 📝 Programming in Mode 1(strobed Input/Output) for 8255A 📝 Input Control Signals in Mode 1 for 8255A

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