What CPU response signal confirms that CPU has yielded control of system buses to DMA controller?

Subject: Computer Architecture and Organization

Topic: Input-Output (I/O) Organization & DMA

Options:

1. Option A: Bus Grant / HOLD Acknowledge (HLDA)
2. Option B: Interrupt Acknowledge (INTA)
3. Option C: Ready Line
4. Option D: Chip Select (CS)

Correct Answer:

Option A: Bus Grant / HOLD Acknowledge (HLDA)

Explanation:

The CPU places its output drivers in High-Impedance (Hi-Z) state and asserts HLDA (HOLD Acknowledge) to grant bus mastership to the DMA controller.