📝 Read Display RAM of 8279

📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 16 questions available

Practice MCQs for Read Display RAM 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

Q1. In a circuit using the 8253 timer, which pin must be connected to ground to ensure proper operation of counter 0?

🔹 A. Pin 10 (OUT 0)

🔹 B. Pin 12 (GROUND)

🔹 C. Pin 21 (CS)

🔹 D. Pin 22 (RD)

💡 Difficulty: easy | ✅ Correct: B

Q2. A CPU wants to read the current count from counter 1. Which combination of control signals must be asserted?

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

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

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

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

💡 Difficulty: medium | ✅ Correct: A

Q3. To read the value of counter 2 without affecting counters 0 or 1, which control signal states should be set?

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

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

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

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

💡 Difficulty: hard | ✅ Correct: A

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