For which memory bus the control lines are different?*IsolatedMemory mappedDMANone of above

To determine which memory bus has different control lines, let's break down what each option means in the context of computer architecture.

1. Isolated Memory: This type of memory interfacing has its own set of control lines that are separate from the main system bus, allowing for dedicated control signals. This means that the control lines can differ from those used for regular memory operations.

2. Memory Mapped: In memory-mapped I/O, input/output devices are treated as if they are memory locations. As a result, the control lines used here are typically the same as those for accessing regular memory. Hence, the control lines are not different.

3. DMA (Direct Memory Access): In DMA, control lines are also used to negotiate data transfer directly between peripherals and memory without involving the CPU. The control lines may differ, but they often overlap with regular memory control lines, depending on the specific architecture.

4. None of the above: This option suggests that none of the previous types have different control lines.

Given this analysis, the correct option here is Isolated Memory, as it is the only configuration in which the control lines are guaranteed to be different from those used for typical memory accesses.

Final Answer

Isolated Memory is the correct answer, as it has different control lines compared to the other options.