We'd like to support PowerBooks, but the challenges of the very custom hardware inherent in laptop designs makes this much more difficult than supporting the fairly standardized designs for desktop Macintoshes and Macintosh clones.
We do understand that many PowerBook owners would like the BeOS to run on their systems, but the engineering challenges are formidable, and at this time we do not have the technical information necessary to even begin work, nor does Apple seem inclined to give it to us.
At this time the BeOS is not compatible with any PowerBook system. Maybe in a future release. Thanks for understanding this issue.