Problem in PS_1_4

I'm maintaining an old project.

Its Shader is ps_1_4 with dx8.0.

Now I have a assembly like this:

ps.1.4
texld r0,t0
mul r0, r0, v0 

when I compiled with psa.exe or D3DXAssembleShader in program.

I recieved the error msg "(1) : (Assembly Error) syntax error"

Why?? texld syntax error???