there used to be some code floating around for it that was develop by a team a few years back to be able to do floating point math.....kinda.....ill see if i can find it again, or maybe some nice person will post a link
[EDIT] found it
http://www.chiefdelphi.com/media/papers/1575 [/EDIT]
hope it helps....i don't like to mess with trig on this hardware, but this made life a little easier....