📝 Microprocessor Compatible D/A Converter in 8085 Microprocessor

Q1. A system uses DMA channel 0 of the 8257 to transfer 512 bytes from memory address 3000H to a peripheral. Which I/O write sequence correctly loads the Mode Set Register for a memory‑read operation?

💡 Difficulty: easy | ✅ Correct: A

Q2. To perform a memory‑read DMA of 2 K bytes using channel 2, the mode word must encode D15‑D14 = 10 and D10‑D0 = 11111111111. Which hexadecimal value represents this mode word?

💡 Difficulty: medium | ✅ Correct: A

Q3. A designer needs to move 1024 bytes from a peripheral to memory starting at 4000H using channel 1, with auto‑initialization disabled. Which of the following I/O write sequences correctly sets the mode word, terminal count, and address registers?

💡 Difficulty: hard | ✅ Correct: C