This is why DOS games that supported 3DFX just talked directly to the GPU. They documented all the registers mapping for direct access. Didn't even need to inst

This is why DOS games that supported 3DFX just talked directly to the GPU. They documented all the registers mapping for direct access. Didn't even need to install drivers. DOS was in its twilight years at that point, Nvidia/ATI didn't bother with DOS support so they just kept them behind OpenGL/DirectX.