Memory Interfacing

Step 1: Understand the memory chip and addressing.
The memory chip in question is the 8155 static RAM, with a size of 256 x 8, which provides a total of 2048 bytes (2K).

- The 8085 microprocessor uses a 16-bit address bus, allowing it to access 64KB of memory.

- The 8205 decoder takes the higher 3 bits (A13, A14, A15) and generates the appropriate chip enable (CE) signals based on the address range specified by the memory chip.

Step 2: Determine the foldback memory range.
Given that the 8155 memory chip is 2K (2048 bytes), it occupies the range starting from the base address . The range of 2K memory in hexadecimal is to .

Step 3: Conclusion.
Thus, the foldback memory address range for the memory chip is , which corresponds to option (3).