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📝 Keyboard/Display Mode Set of 8279

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 9 questions available

Practice MCQs for Keyboard/Display Mode Set of 8279. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

Easy Questions

Medium Questions

Hard Questions

📝 Sample Questions

Q1. To generate a periodic interrupt using counter 1, which pins must be used for the gate and clock inputs?

🔹 A. Pin 13 (OUT 1) and Pin 14 (GATE 1)

🔹 B. Pin 14 (GATE 1) and Pin 15 (CLK 1)

🔹 C. Pin 15 (CLK 1) and Pin 16 (GATE 2)

🔹 D. Pin 12 (Ground) and Pin 13 (OUT 1)

💡 Difficulty: easy | ✅ Correct: A

Q2. A programmer wants to load a new count value into counter 0. Which combination of control signals should be asserted?

🔹 A. CS = 0, RD = 1, WR = 0, A1 = 0, A0 = 0

🔹 B. CS = 0, RD = 0, WR = 1, A1 = 0, A0 = 1

🔹 C. CS = 1, RD = 0, WR = 0, A1 = 1, A0 = 1

🔹 D. CS = 0, RD = 1, WR = 1, A1 = 1, A0 = 0

💡 Difficulty: medium | ✅ Correct: A

Q3. A CPU needs to read the current value of counter 2 while counter 1 is being loaded with a new count. Which control‑signal combination correctly performs the read without interfering with the load operation?

🔹 A. CS = 0, RD = 0, WR = 1, A1 = 1, A0 = 0

🔹 B. CS = 0, RD = 1, WR = 0, A1 = 0, A0 = 1

🔹 C. CS = 1, RD = 0, WR = 1, A1 = 1, A0 = 0

🔹 D. CS = 0, RD = 0, WR = 0, A1 = 1, A0 = 1

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 INTEL Programmable Keyboard/Display Interface 8279 📝 Block Diagram of 8279 📝 Functional Description of 8279 📝 Key Board San of 8279 📝 Scanned Keyboard of 8279

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