📝 Binary Ladder D/A Converter in 8085 Microprocessor

Q1. When the mode word \(0x42\) is written to the Mode Set Register at address \(0x78\), which operation is being configured for channel 0?

💡 Difficulty: easy | ✅ Correct: A

Q2. In the 8257 mode word, which bits determine whether a channel is enabled, and what value must they have to activate channel 0?

💡 Difficulty: medium | ✅ Correct: C

Q3. Why does the 8257 encode the channel number in bits D7‑D6 of the mode word rather than using a separate register?

💡 Difficulty: hard | ✅ Correct: A