"Last month right before FOSDEM 2008, the 3D programming
documentation for the R500 GPUs (Radeon X1000) series was released. This
documentation consisted of a register reference guide for the R500 GPUs
as well as a programming guide covering such areas as the command
processor, vertex shaders, and fragment shaders. While the register
reference guide for the R600 series is still being worked on, for those
with older ATI graphics processors, AMD has went back and created a
register reference guide for the R300 series."