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📝 DMA Channels of 8257

📖 From An Introduction To Microprocessor 8085 • 12. Direct Memory Access Controller: 8257 • 10 questions available

Practice MCQs for DMA Channels of 8257. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. What is the primary function of the Intel 8257 DMA controller?

🔹 A. To increase CPU clock speed

🔹 B. To transfer data between memory and I/O devices without CPU intervention

🔹 C. To store program code

🔹 D. To generate interrupts

💡 Difficulty: easy | ✅ Correct: B

Q2. A system needs to copy 1024 bytes from a sensor buffer starting at address \(0x2000\) to RAM starting at \(0x8000\) using channel 2 of the 8257. Which register setting is required for the count register?

🔹 A. \(1024\)

🔹 B. \(512\)

🔹 C. \(2048\)

🔹 D. \(256\)

💡 Difficulty: medium | ✅ Correct: A

Q3. Explain why the two most significant bits of the 8257’s count register are used to indicate the type of DMA operation rather than part of the byte count.

🔹 A. They extend the address range

🔹 B. They store the mode (read, write, verify)

🔹 C. They provide error‑checking bits

🔹 D. They are reserved for future use

💡 Difficulty: hard | ✅ Correct: B

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🔗 Related Topics

📝 Block Diagram of 8257 📝 Data Bus Buffer of 8257 📝 Read/ Write Logic of 8257 📝 Control Logic of 8257 📝 Mode Set Register of 8257

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