[DirectX 8.1 C/C++ Programmer's Reference] Input Registers (100%)

DirectX 8.1 (C++) > DirectX Graphics > Reference > Vertex Shader Reference > Registers

[DirectX October 2006 Documentation] Input Color Register (61.195652173913%)

DirectX Graphics > Direct3D 9 > Reference > Asm Shader Reference > Pixel Shaders > Registers

[DirectX October 2006 Documentation] Input Register (58.4963768115942%)

DirectX Graphics > Direct3D 9 > Reference > Asm Shader Reference > Vertex Shaders > Vertex Shader Registers