rumors that chip designer ARM has been trying to get its wares into the Macbook Air. While we can't add anything to that particular story, we do have further evidence that ARM is going beyond smartphones and tablets in order to target bigger form factors. The company's president, Tudor Brown, has just appeared at Computex to declare that ARM wants to conquer the "mobile PC market", where the company currently only has a 10 percent share. He's aiming for 15 percent by the end of this year, and an Intel-provoking 50 percent by 2015. "Mobile PC" is a pretty ambiguous category, but we think it's safe to assume the focus is on low- and mid-power netbooks and ultraportables. Such devices could potentially run off ARM's forthcoming multi-core chips -- like perhaps the quad-core beast inside NVIDIA's mind-blowing Kal-El processor, or the more distant Cortex-A15. It's hard to imagine these tablet-centric chips ever competing with Intel's top performers, but four years is a mighty long time in this business.