Question

In 8085 microprocessor, two address lines namely A13 and A6 have become faulty and are stuck at logic 0. Which of the following address locations cannot be accessed in the memory?

• A. 0000H
• B. 1F1FH
• C. 1FFFH
• D. 1F0FH

Hint:

Faulty address lines limit the memory locations that can be accessed in a microprocessor system.

Answer 1

The Correct Option is C

- A13 and A6 being stuck at logic 0 implies that the memory addresses where these bits must be 1 cannot be accessed. 
- In \( 1FFF_H \), A13 and A6 are both 1, making it inaccessible. 
Conclusion: The correct answer is option (c).