hw 3d demo for x86/ATI R500 GPU (not by me)

[Andrew-R]

Found this link only today, was impressed

GitHub - buhman/r500: 3D graphics on Radeon R500: no game engine, no OpenGL, no Direct3D, no Vulkan, just direct hardware/register accesses

3D graphics on Radeon R500: no game engine, no OpenGL, no Direct3D, no Vulkan, just direct hardware/register accesses - buhman/r500

github.com

Radeon R500

May be @joevt will find some of it useful or at least interesting.