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📝 End Interrupt/Error Mode Set of 8279

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 8 questions available

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

🔄 Last updated: 2026-07-30

2
Easy Questions
4
Medium Questions
2
Hard Questions

📝 Sample Questions

Q1. A designer connects the output of counter 0 to an LED. Which pins must be used for the output and its ground reference?

🔹 A. Pin 11 for output and Pin 12 for ground
🔹 B. Pin 10 for output and Pin 12 for ground
🔹 C. Pin 13 for output and Pin 12 for ground
🔹 D. Pin 10 for output and Pin 21 for chip select

💡 Difficulty: easy | ✅ Correct: A

Q2. If CS is low, RD is low, and WR is high, what operation does the 8253 perform?

🔹 A. Read counter 0
🔹 B. Write mode word
🔹 C. Load counter 1
🔹 D. No operation

💡 Difficulty: medium | ✅ Correct: A

Q3. During a write operation, the CPU drives CS low, WR low, and sets A1=1, A0=1 while keeping RD high. What does the 8253 interpret this combination as?

🔹 A. Read counter 2
🔹 B. Load counter 0
🔹 C. Read counter 1
🔹 D. Write Mode Word

💡 Difficulty: hard | ✅ Correct: D

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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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