I have an encoder that is outputing via differential line driver output, MC3487. I must connect this to the PCI 6602. As it stands, in the current configuration, I have A, Anot, B, Bnot, C, Cnot, D, Dnot. With a Quad line receiver, MC3486, I end up with A, B, C, D . Even so, that is 4 inputs opposed to the standard 2, A and B. Please supply a solution if you have encountered such a problem.