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13. Interfacing Data converters: A/D and D/A Converters - An Introduction To Microprocessor 8085

📖 From An Introduction To Microprocessor 8085 • 205 questions available

Practice MCQs for 13. Interfacing Data converters: A/D and D/A Converters. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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Q1. What hexadecimal value is loaded into the Mode Set Register to enable channel 0 and start a DMA transfer?

🔹 A. 41H

🔹 B. 42H

🔹 C. 43H

🔹 D. 44H

💡 Difficulty: easy | ✅ Correct: A

Q2. Why must the terminal count be loaded first with the LS byte and then the MS byte when initializing the 8257 DMA controller?

🔹 A. Because the controller automatically increments the MS byte after the LS byte is written

🔹 B. Because the LS byte contains the most significant part of the count

🔹 C. Because the hardware latches the LS byte before the MS byte to avoid overflow errors

🔹 D. Because the order does not matter; both bytes are stored simultaneously

💡 Difficulty: medium | ✅ Correct: B

Q3. To transfer 2 Kbytes (2048 bytes) from memory to a floppy using channel 1, which mode‑word hexadecimal value correctly indicates a memory‑read operation?

🔹 A. 10H

🔹 B. 20H

🔹 C. 30H

🔹 D. 41H

💡 Difficulty: hard | ✅ Correct: D

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