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📝 Address Buffer and Address Data Buffer of 8085 Microprocessor

📖 From An Introduction To Microprocessor 8085 • 5. The 8085 Microprocessor • 8 questions available

Practice MCQs for Address Buffer and Address Data Buffer of 8085 Microprocessor. Test your knowledge with carefully crafted questions across easy, medium, and hard difficulty levels.

🔄 Last updated: 2026-07-30

2
Easy Questions
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Medium Questions
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Hard Questions

📝 Sample Questions

Q1. A program needs to store the address of the next instruction in the address buffer while also storing the opcode in the data buffer. Which pair of registers is best suited for holding the 16‑bit address?

🔹 A. H‑L pair
🔹 B. B‑C pair
🔹 C. D‑E pair
🔹 D. Accumulator and Flags

💡 Difficulty: easy | ✅ Correct: A

Q2. Why does the SAP‑III architecture provide separate address and data buffers instead of a single combined register?

🔹 A. It allows simultaneous fetch of address and operand, improving execution speed.
🔹 B. It reduces overall power consumption of the CPU.
🔹 C. It simplifies handling of the four flag bits.
🔹 D. It increases the number of general‑purpose registers available to the programmer.

💡 Difficulty: medium | ✅ Correct: A

Q3. A routine must copy 256 bytes from a source block whose base address is in the D‑E pair to a destination block whose base address is in the H‑L pair, using auto‑increment on both address buffers. Which pseudo‑code snippet correctly performs the copy without overwriting source data?

🔹 A. LOOP: MOV A,M ; (DE) MOV M,A ; (HL) INX D ; INX E INX H ; INX L DCR B JNZ LOOP
🔹 B. LOOP: MOV A,M ; (HL) MOV M,A ; (DE) INX H ; INX L INX D ; INX E DCR B JNZ LOOP
🔹 C. LOOP: LDAX D ; (DE) STAX H ; (HL) INX D ; INX H DCR B JNZ LOOP
🔹 D. LOOP: LDAX D ; (DE) STAX H ; (HL) DCR B JNZ LOOP

💡 Difficulty: hard | ✅ Correct: A

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🔗 Related Topics

📝 Architecture of 8085 Microprocessor📝 Register Section of 8085 Microprocessor📝 Arithmetic and Logical Unit (ALU) of 8085 Microprocessor📝 Timing and Control Unit of 8085 Microprocessor📝 Interrupt Control of 8085 Microprocessor
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