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📝 Output Register of Simple as Possible (SAP) I Computer

📖 From An Introduction To Microprocessor 8085 • 2. Simple as Possible (SAP) - I • 8 questions available

Practice MCQs for Output Register of Simple as Possible (SAP) I Computer. 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
2
Hard Questions

📝 Sample Questions

Q1. What is the primary function of the Output Register in a CPU?

🔹 A. Store intermediate ALU results
🔹 B. Hold data to be sent to output devices
🔹 C. Generate clock pulses for the system
🔹 D. Decode machine instructions

💡 Difficulty: easy | ✅ Correct: B

Q2. A microcontroller needs to display the sensor value \(0x3A\) on a 7‑segment LCD. Which sequence correctly uses the Output Register?

🔹 A. Load \(0x3A\) into the ALU, perform addition, then write result to memory
🔹 B. Write \(0x3A\) directly to RAM and let the LCD read from RAM
🔹 C. Store \(0x3A\) in the Input Register and wait for an interrupt
🔹 D. Place \(0x3A\) into the Output Register, then trigger the output unit to drive the LCD

💡 Difficulty: medium | ✅ Correct: D

Q3. A system has two output devices, an LED panel and a speaker, sharing the same Output Register. If the CPU writes the value \(0b1010\) intending to light the LED panel only, which outcome best describes the result?

🔹 A. Both the LED panel and speaker receive the same pattern, causing unintended sound
🔹 B. Only the LED panel updates because the speaker ignores the lower bits
🔹 C. The CPU will automatically split the value, sending appropriate bits to each device
🔹 D. The write is ignored because a single register cannot drive two devices simultaneously

💡 Difficulty: hard | ✅ Correct: A

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