← Back to 10. Programmable Keyboard and Display Interface: 8279

📝 Left Entry Mode(Type Writer Mode) of 8279

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

Practice MCQs for Left Entry Mode(Type Writer Mode) 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. Which pin on the 8253 provides the ground connection?

🔹 A. Pin 12

🔹 B. Pin 10

🔹 C. Pin 21

🔹 D. Pin 24

💡 Difficulty: easy | ✅ Correct: A

Q2. How does the combination CS=0, RD=0, WR=1, A1=0, A0=1 affect the 8253's operation?

🔹 A. Load counter 1

🔹 B. Read counter 1

🔹 C. Write mode word

🔹 D. No operation

💡 Difficulty: medium | ✅ Correct: D

Q3. Explain why the 8253 requires both a gate input and a clock input for each counter to generate a timed output.

🔹 A. The gate supplies the data value

🔹 B. The clock provides timing while the gate enables counting

🔹 C. Both signals are redundant and interchangeable

🔹 D. The gate determines the voltage level of the output

💡 Difficulty: hard | ✅ Correct: A

⬆️ View all questions in the quiz below

🔗 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

🚀 Start Quiz 📝 Practice Mode