> I put this scheme together in the summer of 1987. (Thanks to folks at UC Berkeley for the idea. Their wiring is slightly different, I gather for historical re

> I put this scheme together in the summer of 1987. (Thanks to folks at UC Berkeley for the idea. Their wiring is slightly different, I gather for historical reasons, but the basic idea was there. If I can find out who really originated this scheme, I'd like to credit him or her by name.) I'm pretty sure some of the ISA bus multiport serial cards were using something like this before '87. It was used but not for "consumer" gear.