Question

Consider the following statements regarding the 8085 microprocessor :
• [A.] The 8085 is an 8-bit microprocessor.
• [B.] It has a 16-bit address bus, allowing it to access 64 KB of memory.
• [C.] It has 40 pins.
• [D.] It uses a multiplexed address/data bus. Choose the correct answer from the options given below :

• A. A, B, C Only
• B. A, B, D Only
• C. A, C, D Only
• D. A, B, C, D

Hint:

Important 8085 features:
• 8-bit processor
• 16-bit address bus
• 64 KB memory access
• 40-pin package
• Multiplexed address/data bus

Answer 1

The Correct Option is D

Concept: The Intel 8085 is a widely used 8-bit microprocessor. Its architecture contains:
• 8-bit data bus
• 16-bit address bus
• 40-pin DIP package
• Multiplexed lower-order address/data lines

Step 1: Analyze statement A. Statement A says: \[ \text{8085 is an 8-bit microprocessor} \] This is correct because:
• ALU operations are performed on 8-bit data.
• Data bus width is 8 bits. Hence: \[ A \text{ is correct} \]

Step 2: Analyze statement B. 8085 has: \[ 16 \text{-bit address bus} \] Maximum memory locations addressable: \[ 2^{16}=65536 \] \[ 65536 \text{ bytes}=64\text{ KB} \] Therefore: \[ B \text{ is correct} \]

Step 3: Analyze statement C. The physical package of 8085 contains: \[ 40 \text{ pins} \] Thus: \[ C \text{ is correct} \]

Step 4: Analyze statement D. 8085 uses: \[ AD_0-AD_7 \] These lines are multiplexed for:
• Lower-order address
• Data transfer Hence: \[ D \text{ is correct} \]

Step 5: Determine final answer. All statements: \[ A,\ B,\ C,\ D \] are correct.

Step 6: Write the final answer. Therefore the correct option is: \[ \boxed{(D)\ A,\ B,\ C,\ D} \]