Well, I got my hands on a couple of MAX3421 chips. I appreciate the links you sent me, too, btw. Now, one more question...I noticed some bus/buffer drivers (conveniently after ordering the MAXs)... 74lvc1g125 I believe they are. There being only 3 (or 4...can't remember), would a max232 be a viable substitution? I'm ordering some of the buffers anyways, but just out of curiosity...