Hm, DX9c should be the first DX version to support shader model 3, which by the Unity graphics emulation should work. I see that on shader model 2 emulation, I get the pink instead of text that you describe. OpenGL 1.4 is really old though, so I'm quite confident Unity as a renderer doesn't support hardware that old. I'm afraid there's not much else I can do then to help you play the game. I'm really sorry!