Question

In 8085 microprocessor, unfortunately, 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:

Understand the importance of address lines and how stuck-at faults limit the accessible address locations.

Answer 1

The Correct Option is D

In an 8085 microprocessor, the address lines A13 and A6 are stuck at logic 0, this means those bits cannot be 1. When they are forced to be zero it reduces the number of locations which can be accessed. For 1F0FH the bits for A13 and A6 are 1 and 0, and since these locations cannot be accessed this is the correct answer.