1. An expansion memory module for a computer comprising: a printed circuit board having a connector to couple to a computer system and having a plurality of mounting locations, each mounting location adapted for mounting a memory chip, and, a line driver on said circuit board having a set of inputs for receiving signals from a computer system and having a plurality of sets of outputs replicating said signals received at said set of inputs, each of said sets of outputs being coupled to a subset of said mounting locations by conductors on said printed circuit board.