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📝 Stack and I/O Instructions of SAP-III Computer

📖 From An Introduction To Microprocessor 8085 • 4. Simple as Possible (SAP) - III • 22 questions available

Practice MCQs for Stack and I/O Instructions of SAP-III Computer. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

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📝 Sample Questions

Q1. In SAP-III architecture, which register commonly contains the address of the current top of the stack?

🔹 A. Stack Pointer (SP)

🔹 B. Program Counter (PC)

🔹 C. Accumulator (ACC)

🔹 D. Instruction Register (IR)

💡 Difficulty: easy | ✅ Correct: A

Q2. Which statement correctly describes the difference between IN and OUT instructions?

🔹 A. Both use the same opcode

🔹 B. IN reads data, OUT writes data

🔹 C. IN writes data, OUT reads data

🔹 D. Both are only used for memory‑mapped I/O

💡 Difficulty: medium | ✅ Correct: B

Q3. Why does SAP‑III employ a separate I/O address space distinct from main memory?

🔹 A. Reduces instruction count

🔹 B. Enables faster arithmetic

🔹 C. Has no effect

🔹 D. Allows isolation of I/O from memory

💡 Difficulty: hard | ✅ Correct: D

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🔗 Related Topics

📝 Programming Model of SAP-III Computer 📝 Instruction Set of SAP-III Computer 📝 Data Transfer Group of SAP-III Computer 📝 Arithmetic Group of Instructions of SAP-III Computer 📝 Logic Transfer Group of SAP-III Computer

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