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📝 Key Board San of 8279

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 12 questions available

Practice MCQs for Key Board San of 8279. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

1
Easy Questions
6
Medium Questions
5
Hard Questions

📝 Sample Questions

Q1. Which pin number on the 8253 chip is designated as the ground terminal?

🔹 A. 12
🔹 B. 10
🔹 C. 21
🔹 D. 24

💡 Difficulty: easy | ✅ Correct: A

Q2. What is the primary function of the CS (Chip Select) pin on the 8253 timer?

🔹 A. It enables the device when driven low
🔹 B. It provides the clock signal
🔹 C. It selects the counter to be accessed
🔹 D. It reads the counter value

💡 Difficulty: medium | ✅ Correct: A

Q3. Why are the states marked “X” in the control‑signal table considered undefined?

🔹 A. Because the chip’s behavior is not guaranteed for those combinations
🔹 B. Because they represent illegal hardware connections
🔹 C. Because they are used for power‑down mode
🔹 D. Because they indicate a fault condition

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 INTEL Programmable Keyboard/Display Interface 8279📝 Block Diagram of 8279📝 Functional Description of 8279📝 Scanned Keyboard of 8279📝 Two key Lockout of 8279
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