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📝 Status Word Register of 8257

📖 From An Introduction To Microprocessor 8085 • 12. Direct Memory Access Controller: 8257 • 9 questions available

Practice MCQs for Status Word Register of 8257. 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
3
Hard Questions

📝 Sample Questions

Q1. What is the width of the address register associated with each DMA channel in the 8257 controller?

🔹 A. 8 bits
🔹 B. 16 bits
🔹 C. 12 bits
🔹 D. 24 bits

💡 Difficulty: easy | ✅ Correct: B

Q2. A system needs to transfer exactly \(500\) bytes using channel 0 of the 8257. Which hexadecimal value should be loaded into the count register (least‑significant 14 bits) to achieve this transfer?

🔹 A. 500
🔹 B. 1000
🔹 C. 250
🔹 D. 512

💡 Difficulty: medium | ✅ Correct: A

Q3. In the 8257 DMA controller, the two most significant bits of the count register are used to indicate which of the following?

🔹 A. The priority level of the channel
🔹 B. The type of I/O device
🔹 C. The direction of the transfer (read, write, verify)
🔹 D. The interrupt vector

💡 Difficulty: hard | ✅ Correct: C

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🔗 Related Topics

📝 Block Diagram of 8257📝 DMA Channels of 8257📝 Data Bus Buffer of 8257📝 Read/ Write Logic of 8257📝 Control Logic of 8257
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