📝 Rotating Priority Mode of 8259A

Q1. A designer connects the CLK0 pin to a 1 kHz square‑wave source and programs counter 0 for mode 2 (rate generator). Which pin will present the divided frequency output?

💡 Difficulty: easy | ✅ Correct: A

Q2. If A0=0, A1=1 and the WR line is driven low while the CPU supplies data, what operation does the 8253 perform?

💡 Difficulty: medium | ✅ Correct: C

Q3. Which pin number on the 8253 package corresponds to the OUT2 terminal?

💡 Difficulty: hard | ✅ Correct: B