scubamickey:They use the Suunto RGBM. According to Bruce Weinke's book "Reduced Gradient Bubble Model in Depth", The Suunto computers are an RGBM algorithm. RGBM is an expansion of the Haldane model and I belive it has Buhlmann wrapped up into its package. Although, I have read different explanations from other divers here on the forum.
http://www.rgbmdiving.com/index.htm
You may also want to take a look at, "Physics, Physiology, and Decompression Theory for the Technical and Commercial Diver", by Bruce Winke. Not a bad read....