📖 From An Introduction To Microprocessor 8085 • 14. Serial Communication and Programmable Communication Interface • 5 questions available
Practice MCQs for Programming of 8251A in 8085A Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.
🔄 Last updated: 2026-07-30
Q1. Which pin on the 8257 DMA controller is used to signal a terminal count?
💡 Difficulty: easy | ✅ Correct: B
Q2. What is the purpose of the two most significant bits of the 16‑bit terminal count register in the 8257?
💡 Difficulty: medium | ✅ Correct: B
Q3. If the DMA address register for channel 0 is loaded with 0x3C00 and the terminal count register is set to transfer 4 KB, after the transfer completes, what will be the final address value in the address register?
💡 Difficulty: hard | ✅ Correct: A
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