Discussion
\(IO/\overline{M}\) signal is generally used for distinguishing between :
Answer: B
The keyed answer is memory mapped IOs and IO mapped IOs.
In the 8085, the \(IO/\overline{M}\) line tells external circuits whether the address on the bus belongs to the I/O space or to memory. It is high for IN and OUT instructions, which address ports in the separate I/O space (I/O mapped I/O), and low for memory operations, which include devices placed in the memory address space (memory mapped I/O).
It plays no part in telling keyboard input from memory, serial from parallel communication, or synchronous from asynchronous transfers.
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