📖 From An Introduction To Microprocessor 8085 • 10. Programmable Keyboard and Display Interface: 8279 • 8 questions available
Practice MCQs for Scanned Keyboard of 8279. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.
🔄 Last updated: 2026-07-30
Q1. A designer connects pin 11 (GATE0) to ground to keep counter 0 disabled. Which pin should be observed to confirm that counter 0 is not counting?
💡 Difficulty: easy | ✅ Correct: A
Q2. To load counter 2 with the value 5000, which control signal levels must be set on CS RD WR A1 and A0?
💡 Difficulty: medium | ✅ Correct: B
Q3. If both address lines A0 and A1 are high, CS is low, WR is low, and RD is high, what operation does the 8253 perform and which counter is affected?
💡 Difficulty: hard | ✅ Correct: C
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