Features

X server

 * XFree86 and X.org support

Xaa

 * X Acceleration Architecture

Xv

 * One Hardware or OpenGL overlay

TV Out

 * NTSC and PAL support

TV In
(No support)
 * Support for the build in tuner in "All-in-Wonder" carts.

OpenGL
BUT NOT the OpenGL 2.0 version of the shading language.
 * Provides some OpenGL 2.0 commands

The ATI driver uses a version of the shading language called the ARB extension. The ARB extension was used before OpenGL 2.0 was finished.