Solution

The correct answer is A, B Only

Key Points

• Isolated I/O (A): Also known as port-mapped I/O, this method uses separate address spaces for memory and I/O devices. The CPU has distinct instructions to access I/O addresses.
• Memory-Mapped I/O (B): In this method, I/O devices are treated as if they were part of the memory. This means that the same address space is used for both memory and I/O devices, but it still fits under the context of addressing distinction in terms of the method of access.

While both methods are distinct in their approach to addressing, they both relate to the concept of addressing I/O, making the combination of these answers appropriate for understanding distinct I/O methods.

Additional Information

• Strobe Control: This method involves a signal called a "strobe" to synchronize the data transfer between the CPU and peripherals.
• Handshaking: It is a method used to control the transfer of data between two devices by using control signals to ensure proper timing and coordination.
• Interrupt: An interrupt is a signal to the processor indicating that an event needs immediate attention. It temporarily halts the current processes, saves its state, and executes a function called an interrupt handler to deal with the event.