I believe, if anybody knew answer to many questions along the lines of yours, the guy would be rich, and Intel would not be in the ditch. To be clear, the I/O

I believe, if anybody knew answer to many questions along the lines of yours, the guy would be rich, and Intel would not be in the ditch. To be clear, the I/O bus with own address space is no longer in use, but design considerations resulting from keeping it around for so long are there.