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Shader Model 2

Shader Model 2 added additional capabilities to shader model 1.

Feature	Capability
Instruction Set	HLSL functions Assembly instructions (see Instructions - vs_2_0, Instructions - vs_2_x, ps_2_0 Instructions, ps_2_x Instructions)
Register Set	Pixel shader registers (see ps_2_0 Registers, ps_2_x Registers) Vertex shader registers (see Registers - vs_2_0, Registers - vs_2_x)
Pixel Shader Max	ps_2_0 - 32 texture + 64 arithmetic ps_2_x - 96 minimum, and up to the number of slots in D3DCAPS9.D3DPSHADERCAPS2_0.NumInstructionSlots. See D3DPSHADERCAPS2_0
Vertex Shader Max	256 instructions
Shader Profiles	ps_2_0, ps_2_x, vs_2_0, vs_2_x

For more details on shader model 2, see:

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