The iBook (dual-USB) and later DO have built-in crossover detection. Which means, I think, only the clamshell iBooks do not have c/o detection. (http://docs.info.apple.com/article.html?artnum=58583) Jon On Sep 30, 2005, at 04:44:55 -0500, Eugene <list- themacintoshguy at fsck.net> wrote: > That explains it. The iBooks don't have built-in crossover detection.